Troubleshooting Common Air Conditioning Problems

Leave a Comment - 128


Tony Escobar

Subject: A/C keeps running continuosly

I have a Grandaire Singled Packaged AC unit, Model GP3RD-024K.
Fan is running, condensers are clean since I cleaned them, fan blower is running,
and installed new return air filter. A/C runs continuously on Auto. Does not reach the desired temperature it seems. Thermostat is old style "White Rodgers" brand.
Can someone tell me what could be the problem and how to resolve it? Thanks

Jeff johnson

Subject: Air conditioner not working

Had pro come out. He replaced fuse. Worked for 5 hours then quit. Now compressor and fan do not turn on. Replaced fuses again still doesnt work. Pro suggested a hard start kit. Furnace fan continues to run


Subject: air conditioner

my air uit works great and cool like it should, but every night around 11:30 pm the house starts to get warm and we realize that the compressor is not running, co we cut the unit on, The next morning around 8:00 am when turned on it work properly again for the whole day until that time of night again. Our thermostat is not a programable one, the unit is not freezing up, the motor will turn and is not hot to the touch, and we have power. This has been going on for about 2 weeks. You would think if the unit was going to stop it would be during the heat of the day at the temps have been around 97 degrees. Any ideas on what could be causing this?

Michael lowe

Subject: Same problem

Works during day and want at night. Been going on for 2 weeks. I have a Roger thermastat. Old style

Ernie Knod

Subject: Same problem here

I have a Maytag 5 ton unit (model# PSH4BG060K) and it is doingthe same thing. I am using an Emerson sensi thermostat. I have tried several things but every night it cuts off. This has been happening for about a week now. It runs and functions properly during the day. Have figured out what is causing this. Any help would be much appreciated.


Subject: fan slows to a stop in like 2 min

Hi. I just bought a wall unit and turned it to "low fan" setting. Within I think a few seconds after it started, I could hear it slowing down, which it continued to do until it came to stop, which only took like 2 minutes. I am charging my cell phone so I can video record it when I turn it to "high fan" setting. I turned to "high fan" setting just for a second to see if it would come on and it did. Can you tell me what types of things could be the problem here?


Subject: I need help

My ac have ice inside everything is a blog of ice idk if is supost to do that is ok or is sum wrong with it


Subject: I need help

If unit has an ice block building this is NOT suppose to happen. You probably have a dirty/plugged filter or evaporator or both. You need to inspect both. Clean evaporator (get evaporator cleaner at a local hardware store) and change filter. You need to shutdown the unit so the ice will melt away. Do not change filter until you melt ice and clean evaporator if needed to be cleaned.


Subject: The Freon is low in your

The Freon is low in your system. You will need to have a professional come out and add more Freon. If the problem continues then you have a leak in the system somewhere and will probably need a new AC unit.

Federico garduno

Subject: A/c does not cool

A/c does not cool every day would work freon is good in certain days when it is humid and it rains or the day before it rains humidity is high it does not cool but the blower works inside for the central unit. Sometimes it works for like 5 min and then no more on and off is there a switch or sensor That is causing this? During the day when it is nice and cool it does it too during the day it seems to work good


Subject: ac messing up

My Coleman unit is only 5 years old. The outside fan works great. I can hear The compressor running one minute and then it just shuts off. It kicks on and off.(will run fine for about 30 mins and kicks off for a while then starts working again) The outside fan will be running with out the compressor running. The outside unit will turn off for a few seconds and then kick back on. (Like turning a light switch off and on) makes a loud hissing/blowing sound sometimes. The high pressure side got up over 630. The unit works great during the night and on cool cloudy days. Only messes up during the day when. It's very hot and sunny out. Doesn't freeze up on the inside or out. New clean filters. Inside and outside coils aren't clogged or dirty. What is going on?


Subject: Problem

I have a window unit in my living room, with the kitchen blocked off so itll stay cool in my living room. for some reason it is still very hot, even on the coldest temp setting of 60 degrees. what is causing it to only be cold when standing directly in front of it?


Subject: Split unit ac is licking inside

My internal wall unit started licking water inside. I assume it is some kind of blockage that prevents it from working properly. Please, advise me what to do.

Jim McNeely

Subject: A/C volume 1,2,3 is not working

I had this problem on my 2001 Dodge Dakota. The problem was the blower motor resistor card which is located in the plastic duct work under the glove box on passenger's side of truck. Cost of a new resistor card is about $12 from AutoZone, etc. Easy to replace, two screws hold it in place, and you have to unplug the cable going to it. Good luck!


Subject: Ac not working

Stephen, a lot of cars have a resistor pack that is used for the slower speeds. On some vehicles it is a little module attached to the firewall in the engine compartment. Do a google or YouTube search for your vehicle.


Subject: Ac not working properly

My split ac ons and works fine for the first cool but it doesn't repeat the cycle it doesn't get on and I have to off the ac for 15 min then it works fine .. For the first time then same problem let me know the reason for the problem?? thank u



Iam having an whirlpool 1.5 ton window AC, which is getting trip off every after 15 minuts.and getting s/w on after 20minuts.
Kindly guide me what to do.


Subject: Madhan's A/C

I'm not an HVAC professional so take my advice for what it's worth. It sounds to me like your system is shutting down due to overheating rather than because it reached your desired temperature. When you turn it off and back on, you're allowing cooling-down time and re-setting it, only to have it overheat the next time you turn it on. If this is what's causing your problem, chances are your evaporator and/or condenser need to be cleaned. If you don't feel competent to do it yourself, I'd suggest contacting a professional ASAP before the repeated overheating does permanent damage.

John Bobay

Subject: What fixed my problem

I had the same problem with a 10-year-old A/C. Compressor would run for the first cycle, then it needed an hour or so to rest before it would start again, though the outside fan would run, but no compressor. After checking the breaker & power to the unit, I thought it may be a low coolant issue. But I had a professional look at it, and without even opening the unit, he went to his truck and got a 'booster capacitor' (which gives an extra power boost to start the very power-hungry compressor motor). After opening the unit, he confirmed the unit did not have one and needed one. After installation, the A/C has worked perfectly every cycle for 2 years so far. The booster cap was only like $10-$20, and I already had the tech out to install a new high efficiency furnace, so for me, it was a cheap fix. I'd suspect you may have the same problem. It was an easy installation, just simply hooking up the cap to the compressor wires, but to find the right size cap & work with 240v, unless you're very familiar with electrical work, I'd have a pro install it. And to test the system for other possible problems. Good luck!


Subject: Air conditioning

Our AC was working perfectly fine. No issues. Well my husband decided to take the cover off which keeps the switch held down and now it won't blow air after he put it back on. Don't ask me why bc I have no idea why he did it. You can hear it running but no air comes out at all. It's not a tripped breaker. I don't get why it stopped working in a matter of seconds. Help!!!

Michael lowe

Subject: Switch

There's a safety switch on the unit that is pressed in by the door. The door isn't all the way in correctly!


Subject: ac stopped working suddenly

Probably you have a blown fuse,that is located inside the unit or a bad capacitor, capacitors are outside at the condenser unit,it looks like a battery,but be careful touching it cause it holds eoectricity and can give you a bad time if you dont know how to take it out

C. Anderson

Subject: Hot in my house!

Hello, my unit is running outside but there's nothing coming out of the vents inside my house. Could it be the filter?

John Marlo

Subject: Bad Compressor?

I had a freon leak, and the HVAC tech notice an oily residue beneath the area where the compressor connects to the lines after running the A/C. He refilled the R22 and applied gel-type R22 sealant but while he was charging up the compressor... it turned off... and it didn't start again since.

What's going on?


Subject: My blue star Ac air outlet is not closing

Hello, as there was dust in my air outlet so i have cleaned horizontal deflector of my air outlet using a brush ... After switching on power ac performance was good with cool air .. But upon switching off ac my air outlet was not closed it remained open .... So please kindly suggest me a solution.. Thank uou

Robert Opoku Duah

Subject: Fan Problem

When I switch my AC on,it takes few minute then the outer unit start working( both the fan and the motor).But few minute later the fan stops whilst the motor continue working. Then the motor stops .later both start working again. Because of this,the room doesn't chill at all.


Subject: A/c freezing up

Your more than likely low on freon. If it's not adequately filled your coils will get a cold spot and start to freeze up.

John G.

Subject: ac unit not heating

I live in an apartment community that has poor management. I did a work order to fix my ac unit because it stopped working. After 5 days of runaround from management, they sent a tech out to replace my compressor. Well now we are in the middle of a cold snap and my heat is blowing cool air. Not sure how to fix this. Its the weekend and i have 2 daughters living here and its 40 degrees outside. We are freezing. Please can anyone help?

Carlene Warren

Subject: Heat pump not functioning properly

The furnace would come on and blow cold air (this is normal) and then it would send out hot air until reaching the correct temp. It would shut of the heat and cold air would continue to blow out for 5/10 minutes. Then it would shut off and come back on within 10 minutes and do the same thing all night long.
I called the company that installed the unit 4 1/2 years ago. They are saying that the evap. coil is leaking fluid and needs to be replaced. The part is under warranty but the labor is not,. They want $1400.00 to fix it. I got a second opinion from another company. They agree the evap. coil is leaking BUT they are saying the unit is too big for my townhouse and the duct work is too small for this unit. They are recommending a whole new unit that is smaller that will work easier with the duct work to the tune of $7200.00. Now I do not know what to do or who to believe. Help.


Subject: My a.c. unit is messed up

I was trying to figure out what is going on with my a.c.unit it's like it's constantly running and if it's on heat it gets so hot in here you can have it set on 65 and it will be 75 in here. You can flip it to the off position and there is still something running and putting out heat. I can turn it to cool position and it will get cool I'm here if I put it on 70 or below but if I put it on 75 it will start putting out heat is there any way to fix this problem can you please help????


Subject: Ac run when heat on

My air condition out side unit only work when I turn on heat & keep over regular temperature when low temperature & set on cool side out side unit not work just furnance blower (inside unite furnance) runaning
can you please resolve this issue please??


Subject: The air from the air

The air from the air conditioner was warm as though I set it to heat mode but it was ok cool mode. I lowered the temperature , after a while , warm air is given out again. The air conditioners in the whole house experienced the same thing. The next day, the air conditioner was working fine again. What's wrong that cause the air conditioners in the whole house to give out warm air despite being in cool mode ?

david shapiro

Subject: a/c compressor

I live in an electric home, no gas
Why when i run my heat in the house the air conditioning compressor (outside) goes on?

Is this normal?

Gary Beeson

Subject: a/c noise

Thermostat is set to off, but every 10 or so minutes the a/c sounds like it's trying to run. To stop this sound I turned off main breaker. Any ideas what's wrong....Thanks

Kasey Alen Mitchell

Subject: AC leaking

Just wondering why an AC unit that was replaced a year ago would be leaking into the floor below it and through the ceiling downstairs (upstairs unit). We have had techs out here several times and they replaced a switch that was malfunctioning, they came back again to insulate the condensation line and then to tape all along the underside where the unit comes in contact with the floor. Smelling damp wood in downstairs bathroom as we have not fixed the ceiling yet and the floor around the unit outside of the tape is moist, though not wet, as unit has been off for the past few days. There is no external pan as the ductwork goes through the floor but we are assured there is an internal pan with safeguards to keep it from leaking, but it does not seem to be working. Any ideas? Obviously the AC people are clueless as to how to fix this. I just don't want to get the ceiling repaired and then have a leak again next season as this is now a yearly thing!


Subject: I fixed the problem thanks to

I fixed the problem thanks to this article. Thanks!

The very first recommendation worked. I turned the thermostat down 5 degrees and it turned on no problem.

Allen Browning

Subject: Most often, this problem is

Most often, this problem is simply the relay/contact assembly located in the outside unit. It is a relay switch that is normally controlled via the thermostat, switching power on & off to the unit. When the contacts are worn down, they can literally stick in the closed position, allowing power to constantly flow to the unit, keeping it on. This part needs replacing, which should restore your unit to normal operation. Thank you for your question.


Subject: Help

Okay so I can't get in touch with my Landlord A/C UNIT HAS WATER AT THE BOTTOM THEY DON'T CONSIDER THIS A EMERGENCY BECAUSE ITS NOT 90 Degrees outside. This unit is old 1998 help me how do I clean it my house is so hot


Subject: general cleaning

Your acu has to be cleaned up further. If you can do it yourself call someone who can help you out it doesn't matter if you or your helper isn't knowledgeable about it as long as you know how to use the basic tools in carpentry like the common tools such as screw drivers, set of pliers, a lye solution which can be found in airconditioning stores and suppliers near you, you have a plastic to cover up the control panel or the wiring connection of this acu,a duck tape or any adhesives to support the plastic bag from getting removed by the running water. No need to buy a water resistant plaster, a simple adhesive tape will do. Just don't unplug the entire wiring connection because it's hard to connect these all without knowledge of reading or comprehending the wiring diagrams. You don't have to be an expert but you must know beforehand the parts of your ACU before you remove its house. Clean it with your complete cleaning equipment,a hose or if you have a pressurized hose or a vaccum pump that can thoroughly removes the hard to reach spaces well that's also advisable to use to lessen your time and effort of buying cleaning agents to stores. Of course be careful of handling or carrying your ACU. General cleaning is usually the other best way to remove that dirts on your ACU but if you're not sure of the real cause of the problem about the air quality, I would like to recommend you to buy a refrigerant tank or a freon tank. This freon is a liquid solution that's made of nitrogen gas and other environment friendly elements that gives your ACU the cold temperature you want don't worry about this solution, it's not harmful or toxic to your health. It's like a dry ice or liquid nitrogen even you dipped your hand on it nothing will happen. It's absolutely safe. But make sure to check out your motor compressor's required freon type because there are lots of freon tanks depending upon your compressor's model,there's R22,R134, etc.. I can no longer discuss the other basics of cleaning the ACU. I hope I've helped you somehow.


Subject: AC UNIT

I would like to know what it means when my indoor AC unit says the "inside unit is not communicating with the outside unit", and how do I fix it or does this mean I have to call a technician? Thank you for all your help!


Subject: same old thing

have my air con.since feb.2008 first yer it worked fine .since then like every year someone is here to look at something. i used to have mine set at 75 .the other day it would not come on i could hear it click like it was gonna come on but it would take a long to to finally come on ,by then the house is up to 80-82 .yesterday i se it at 78 and for now it is coming on and off. anyone out there know anything about this,i have had 3 different companies here no one fixes it right.

Ellen Campbell

Subject: Central Air

Had the unit off most the last wk as it was cool and dry out-came in today & decided to turn it on-but nothing happened. Checked the fuse box and went out and looked at the compressor-all connections seem fine out there. Not blocked. No clue what it could be. Not sure what panels i could take off to check things-no idea what to check if i got them off. Not sure if it's something i could fix myself or if i need to call someone. Electricity fine otherwise.

john santo

Subject: air conditioner

The thermostat checks out fine. Neither the outside condenser nor the inside evaporator fan does nothing. Could it be the relay? Please recommend troubleshooting procedure.

Many thanks and kindest regards,



Subject: Airconditioner

Outside air/heat unit responding to thermostat, fanis not working to get cool air.


Subject: A/C

I have a year old Ingersol Rand A/C unit. Furnace man installed w/o installing new inside. My house is nice and cool but when unit goes on it makes a hissing noise and then a cranking noise for a few minutes then it is fine. What do you think the problem is?


Subject: AC unit

My AC is one unit outside. It is a Goodman. It is 13 months old... Very hot 7/30/15 in NE Tx. It blows air but not cold. I hear it try to cycle and see the lights dim every 2 minutes. It seems it is trying. I turned it off for 5 minutes and back on but did not help. I looked out side and the lines or compressor are not frozen. Can't see the coil and don't know where to look. It is also dark thirty. It is very hot and will call an AC man in the morning. Thanks...


Subject: Hi I also have a good man 2

Hi I also have a good man 2 years old and I have had issue after issue and now the same issue you are having 88 in house it is very hot! I think the company that installed it installed wrong please let me know what you find out thanks

cindy hunter

Subject: air conditioner

I put my friends air conditioner in her window like I always do, it was running fine. Then she started seeing it looked like there was ice forming in the inside and it is dripping water from the front, inside the house, instead of the outside. I tired to tilt it a little but that didn't work. Is there anything I can do ?


Subject: window a unit.

When they freeze up on the inside that means they are usually dirty or the thermostat is not working! Try cleaning the part where the freezing is occurring with a water hose but be careful not to bend the coils!!!!

Jenny Everhart

Subject: central air conditioning. Goodmans

Our unit runs outside not blowing cold air inside. Lines were froze, we checked the breakers. & fuse on unit. Still fan that blows out cold air not working. We changed filter in hallway couldn't find 1 on unit. Any suggestions.


Subject: A/C blows out cool air then hot air

My friend's A/C has been blowing cold air for about 2 hours and then switches to blowing hot air for 15 minutes. They have had two different people look at it and they have tried replacing the motor and the fan motor and the transistor and it is still doing this. At a loss, please help!


Subject: A C not running

Came home house 77 act set at 70 . Went outside unit not running . I can hear a faint noise . Everything inside furnace seems to be working . Any ideas ?

Ellen Williams

Subject: central air

if you have it set at 77 and it says it 76 shuts off but 5 minutes later its back on been doing this a lot?is it also bad to shut off at nite?


Subject: a/c problem

The a/c is set at a certain temperature and after a few hours it will still be running but the temp will start going up. We turn off on the thermostat and then after about an hour, turn back on and it will start cooling again. It does this at least twice a day. Any suggestions??

Russell Frank

Subject: central air gets to cold

We set toe temp to 72 and twice when we get home the temp is 63 and the outside compressor seems to run constantly. The first time I took the batteries out of the t Stat to attempt to re set it and it seemed to work until yesterday when it dropped to 65 again

Barbara M Gaskin

Subject: One room not getting cooled.

What would cause one room not get cool. The room remains 12 degrees hotter than the rest of the house. The room is a converted garage that has always worked on the same system that cools the rest of the house.



Subject: Cooler

Did you check all your duct work to make sure it's still in place..


Subject: I grew up in a home where my

I grew up in a home where my brother and I'm bedroom was a converted garage. It was always hotter in there, despite running the duct work to the room. We purchased one of those small air conditioning units that go in a window or in a square cut into the wall. After that, our room was 12 degrees cooler than the rest of the house rather than 12 degrees hotter. This was in the early 90s though so I can't say for sure whether advances in HVAC technology would negate the solution we implemented. I hope everything works out for you.

Robert Gantry

Subject: one room doesn't get cool

Sounds like a duct problem. If you have an attic or a crawl space, check to see if it's cool up there. If it's cool in your attic then you probably have a broken duct. If that's the case then you can probably find it visually, and tape it back together with duct tape. If it's NOT cold up in the attic, then you may have a blocked duct. That can be a little more involved, as you may need to take apart some ducting to find the blockage. I just re-read your complaint. You may also have insufficient insulation above or around the garage-room.


Subject: a/c

the a/c in my apt stopped working and if we try to turn it on it starts to smell like smoke what could it be?

Robert Gantry

Subject: smell of smoke

You better call an electrician before using your A/C. If there's a short and the breaker is not tripping, then you could burn your house to the ground. I don't mean to scare you, but why take chances.


Subject: dehumidifier running while in a/c mode

I have a portable a/c unit and it has a dehumidifier on it. When I put it on a/c the dehumidifier is also running which makes it a little noisy. How can I fix this problem. Any help would be appreciated.


Subject: Central Air problems

My air works but once it reaches the thermostats room temp the outside unit kicks off but the fan inside continually runs. The air will kick on again if the house temp goes up and it continues to cycle but the inside fan will continue to run everytime the outside unit shuts down. The repairman couldnt get it to do it and told me that it will do it again and to watch for the flashing code. A few hours after he left it began doing it again. The code was a 5 on our York Diamon 80 unit. Unfortunately we rent so everything must be handled through the landlord. I was however wondering if anyone had any knowledge of this brand of A/C unit and could tell me what the Code 5 means.


Subject: Is my cow dead? Saga of an old AC (compressor)

I hope this area is still active. I searched through several pages here trying to find something similar, and maybe there is, and don't recognize one, or I'm in denial. ;-)

We've REALLY been milking along our old "Day n Night" (Carrier) and now - may have milked the cow for the last time. We're in Portland, Oregon, currently in a 90+ to 105 heat wave in June, and I'm DESPERATE! I've listed out tech info I could get, and then our situation and what's been done.

Day n Night (Carrier)
MOD# 565BJ030
Product#: 565BJX030000AAAA
Compressor: R.L.A.- 16.2, L.R.A. 90.0
Volts: 208 - 230
Fan Motor: F.L.A. - 1.0

OLD CAPACITOR (as it appears by line on capacitor)
97F5367 FB
30/5 uf
440VAC 60hz
Protected P924
0 10000AFC
85 - 38

NEW CAPACITOR (as it appears by line on box)
Motor Run Capacitor
30/5 MFD, Round
440/370 VAC
Dual Voltage Rated

FURNACE: Goodman -
don't remember the tonage, but it's set up with variable speed and we had it installed just nine years ago, using the same old coil of the AC.

Our previous and trusted tech came out about three final summers to refill the refrigerant because of some slow leak he couldn't find. In desperation he tried one last refill along with a sealant that we're now regretting. All along he kept saying it was probably the "O" rings (?huh?) but he couldn't find because our model was so old. At that time the compressor was still working fine. The fan has always worked flawless.

I think about a year passed; I was never able to find any such "O" rings, and so no reason to have the tech out. A commercial HVAC friend of ours said he would look and fix for just the parts. He said he had no idea what "O" rings our tech could be talking about. He said there were none.

He found the leak in the larger pipe valve at the outside unit, so he took both the large and small valves out - then joining pipes accordingly and put stems into each, and refilled the refrigerant.

Hearing the compressor working, but nothing flowing, and a lower than normal capacitor amperage - he replaced the old capacitor with the new (info above) but with meters attached to each valve stem saw there was no movement in pressure either way and there by determining the compressor was dead. Previously, he found there was an in-line "screen" in the smaller pipe, where it had a slight bulge about 2 - 3 inches long. He said it "might" be because of the sealant in the lines, but it was most likely the compressor. But of course with the sealant running through the lines, a possible dead compressor

I've read about different types of capacitors, "Start up" and "Run" - some units having a second one, and most on the compressor itself. I haven't looked closely on the compressor itself yet, but saw he replaced the one listed in my info that sat with the electrical area of the unit. ALSO: on the box of the new capacitor it says - "RUN."

_ _ _ _ _ _ _ QUESTIONs _ _ _ _ __ _ _ _
(Q) Are there situations of two capacitors - a run and start?
(Q) Could there be an additional capacitor on the compressor itself?
(Q) Are there typically any kind of reset switches?
(Q) Would the thermostat or furnace need to be reset with the introduction a new capacitor? "ARE" there any 'resets' for those?
(Q) Could there be a resistance & connectivity problem with the ground at this time with what's been done? At one point he switched back and forth three main wires (red, yellow, brown) basically the main power coming in.

I'm emailing our friend with follow up questions. He's the pro, and I know nothing - but because of our heat wave and it's projected length I'm desperate, grasping at straws because we can't afford a new unit now, and even if we could - everyone's booked for weeks.

Is there any hope? Anything I can do, or have my friend try? Or am I in denial and our cow is simply - dead?

Barry - StumpTown, USA
Otherwise: Portland, Oregon (OR-Y-GUN)

Mary Vazquez

Subject: Central A/C

My a/c is cooling just fine however it is leaking all the water inside the unit
into my guest bedroom. Any ideas?


Subject: Central A/C

just recently had same problem, & had to replace inside evaporator, called the man

Randi Beauchane

Subject: A/C Water leaks

Have the same problem a/c works but water leaks...Advised by the service tech, there is a hole in the evaporator pan. Unable to fix it without replacing the evaporator. Looking at a cost of $1100-1200. Age of system is 25 years. In my case we are going to replace the a/c and furnace.

gord kemp

Subject: central A/C

It sounds like the drain is plugged at your furnace from the a coil. If there is a hose coming from the drain try taking it off and blowing air through it. If not there is a small possibility of a cracked drain pan on the a coil, but most likely just a plugged drain line. If the AC drains into a condensate pump also check the pump by pouring some water in it to make sure it is functioning properly and not overfilling and causing your problem


Subject: ac central not up to snuff

Renter set thermostat to stay at 72°
Then when they get home they lower thermostat by one degree it shoots up to 75° then it takes 7 hours to go down to 72° again. Landlord has had the HVAC guys out three times and they said all three times it is running fine and the unit is sufficient large enough for our 1000 square feet 2 bedroom apartment on the second floor. First floor has their air on also but has a larger unit.

Nagaraja Rao

Subject: Temperature is higher than the set temprature

Hi I have brand new unit (5 ton, 16 seer) unit installed less than weeks ago. The reason unto was replaced, because the freon was empty. The system seemed to work fine until today where the set temperature was 77 and room temperature was 82 and then and a few minute later it became 83 degrees. I went out and checked - there was no water dripping. Inside near the air handler, there was no water. I called the company who installed the air conditioner, they came (charged me $85 because it was weekend) and he was testing near the compressor for the freon levels. I could see he was looking for leaks. He could not find any, it seems. Finally, he told that the coil in the air handler is faulty and has to be changed. I do not understand his diagnostics. If cold air is not coming means there is no cold freon. That can happen if the compressor is pumping cold freon. So, what can be the problem? Freon was empty three weeks back,and that is why the system was changed.


Subject: i cant get my ac unit to turn on!

I just bought a used 15,000 btu fridgare window unit. When I plug it in it beeps telling me that it has power but when I go to turn it on nothing happens whatsoever. What could this mean??

Air con problemo

Subject: Air con not working

Pioneer- 13 split mini air conditioner
serial#- 50090049-2002
Inside unit- not blowing air but you can hear it try to.the vents are still moving up and down.You can fill cold air coming out of the air filters.

Outside unit-Blowing out air (warm air )


Subject: ac not blowing out cold air

You need to check the indoor unit fan to see if it is running out just buzzing, trying to run, if you can see the fan wheel get a long screw driver and spin the wheel and if it runs. If it does run then the capacitor is bad if it doesn't run then the motor is bad. You should feel hot air coming out of the unit outside that's the heat the refrigerant had trapped and it's releasing it outside.


Subject: Intermittent cooling stops working it fan works

I rent from an apartment that handles AC repairs. My AC unit works 95% of the time but randomly will blow air at night and will not cool the air. If I turn off the thermostat for 10 minutes and then turn t back on, the issue resolves itself and the air will once again become cool. I do not have an "auto" option on the thermostat either.. This is really just an annoyance because the apartment maintanance cannot find a solution to this intermittent problem. Any suggestions for cause and why simply power cycling the unit temporarily resolves this issue?


Subject: A/C

Did you ever find a solution to this. We are having the same issue and have had 3 different professionals look at it but no solution! $$$ is getting tight!


Subject: air conditioner on but not blowing out cold air

My ac is on and the condenser Outside is running nothing is blocking it at all both are running but it doesn't blow cold air out and the thermostat is new it was replaced only a month ago but now it's set to 85° and when I put it down to 70° it just goes right back to 85° what is wrong with my air conditioner?? Please help!


Subject: Thermostat

Is there Temp Hold or Temp override button on your thermostat? Mine is digital and had a pin hole for reset options, usually I use a safety pin to reset, than I can change the temp up or down, and set it with a temp hold/override button! Check and see if this is your issue

Dannie Mansfield

Subject: copper line freezing over

It can be due to a several of things. One is low refrigerant due to possible leak.You will need to call a repair service to fix.It can also be caused by a dirty filter inside. Lack of air flow across the filter can cause the lines to ice up. Also can be caused by a dirty evaporator coil. Over time dirt can get around a filter an cause the coil to get dirty and restrict air flow. This can be done yourself but will require the partial dis-assembly of the inside unit so I would recommend being done by an A/C repair service.


Subject: mine does the same once I'm

mine does the same once I'm awhile ,had couple of techs came out with different answers so I'm stuck without a positive answer .So my temperary fix is to go knock on the furnace and it kicks in , try that for now til we get a definite answer


Subject: AC Air flow

It may be that the fan motor in the heating unit is not turning, which can be caused a bad motor or an electrical fault in the unit, but it is likely if the breaker has tripped that the AC system would shut down entirely so you would not have cool air in the vent.
If the fan is turning, the most likely cause is that one or more of the vent hoses in the system has come loose or has an opening that is allowing the air to go where it is not supposed to. This could reduce the air flow at the vent drastically while still allowing just enough flow at the vent to feel the cool air.


Subject: low cooling in Bluestar split AC

I have cleaned air filters but also I am getting low cooling.
one month back they did service but it worked only one week . after that again low cooling.

Plz let me why it's working as a low cooling ?


Subject: Leaky winky

It may be due to low refrigerant which is caused by a leak. Gat a manifold gauge and see what you get on the low and high side.


Subject: A/C Unit

My A/C unit is thumping when it shuts off. I think it has been over charged. Is this the problem and what should I do about it?


Subject: Compressor vital

Your compressor is like the heart of the refrigerant system. If it does not work then please replace quickly. Evacuate refrigerant, replace compressor, clear system of containments with nitrogen, pull and hold vacuum, refill system. Sit back and enjoy cool air with a cold beer. Hvac 10 years, nasty NATE certified.


Subject: ac unit

Why is my ac unit dosent turn off I can see my condenser unit turn off and on but unit inside stays on all the time even if i turn it off

Topsy Makunike


Hi, my 48000btu cassette air con compressor is not running. we have changed compressor and pcb but keeps flashing for a faulty.What could be my problem?


Subject: AC Problem

I have black sut all around my air vents what could be the cause of this.


Subject: Intermittent problem

Hi, my central heater sometimes works and sometimes doesnt.

Lets say I set the thermostat to 70 deg (auto). Sometimes even if it gets too cold and the temp is showing in the lower 60 deg, the heater will sometimes come on but sometimes it wouldnt.

I can swithc the terminal to fan/on and it will blow air (not heated) but when I switch to "auto" hoping heater will come on, it doesnt even blow any air.


Subject: air conditioner

just want to know why the circuit breaker always trip after turning on the ac for several minutes


Subject: airconditioner

My home air conditioner works, but it doesn't blow cold air as strong as needed.
What should I do?

Hans Hildebrandt

Subject: central A/C

The technician told me that there is air in the compressor line which causes the unit to have an erratic performance. The solution would be to replace the Freon with a new batch. The cost would be $350.00. Frankly, I've never heard of such a thing. Can anybody help me out?

reynold tabunan

Subject: a/c cooling problem

i just want to ask question about my window type aircon. when the compresor is working the cooling is normal but it takes to 2 to 3 minutes only and then compresor stop. it will start again after 7 to 8 minutes. Can you help me please to determine what problem i have to my window type aircon?

Thank you and more power..


Subject: A/c central unit

The inside blower fan runs intermittently in the ON position and the COOL position but seems to run continuos in the HEAT position. Will a faulty run capacitor works intermittently?


Subject: doesn't shuts down through remote

My AC doesn't shutdown through its remote. when i power on the main supply, its motor automatically starts and wind blows. when i press the power on switch of the remote the swing opens and cooling starts. when i power off the switch from remote, the swing stops but the motor doesn't.

jim dorsett

Subject: leak

the air handler where the main filter is dips most of the time recently--any ideas how to fix

tina tully

Subject: motor

what would couse the motor this is are 3 one. we put a new control board 7/10/13. we the new motor on

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what should you pay.  You pay what you can afford.  1100sqft unit requires a min. of a two ton unit.  prices range from 2100-2900 depending upon the seers of the system.  13 seer is the min. the law requires  and for your situation with 1100 sqft.  do not worry about the seers as long as it is to code.  the bigger the house the more seers for economy.  1100 sqft is at the border line for a two ton system.  It is more important to have your new system balance, there is where you get the economy on your electric bill and gas.  Bryant, lenox, ruud and carrier are the brands you should stay with.All have the same basic factory warrantee and will last you longer than you expect as long as you maintain it with regular check ups twice a year once in the spring and then in the fall.

raymond gonzalez
koolray heating and air
? offers a nice sizing chart for HVAC capacitors and furnace capacitors. Most of the capacitors I've looked at are $5 to $15 dollars, so a little less than Home Depot and Lowes.


Replacement is really easy, but be sure to watch a youtube video on how to replace it like this one:


Stay safe and hire a professional if you feel unsure about doing it yourself!

The only thing of importance, is the hvac professional you choose to use. Alot of manufacturer's pieces are built relatively the same, and will last about the same amount of time. The thing that matters most is what you can not compare between companies, and that is the installation. Purchasing a system is not like purchasing a car, where no matter where you buy it, they are all the same. Each installation is different, and usually what you are paying for is the level of expertise, and quality of the installation, the company who will actual give you the warranty, and the comfort that you will receive. Manufacturers warranties disappear every day. They always have a loophole where they can get out of paying, but your local dealer wants to keep you happy for future work, and to protect his reputation in the communiy. Look up 4 year old Nordyne and Goodman warranty problems. Choose the HVAC professional first. It will cost you the least in the long run. I have had to totally redo plenty of installations that were just performed because of an uncomfortable customer, and a system that keeps breaking down. The equipment is only as good as it's installation, and over 70% are not installed correctly.
I think maybe you are confusing SEER, which is an efficiency-related rating (higher SEER means more effective use of the electric power used to compress the gas), and TONS rating, which is a measure of the total cooling power of the system. (Tons used to mean how many tons per hour of ice was used in evaporative cooling building systems - a Refrigeration or Cooling Ton equals 12,000 Btu/Hour of energy exchange. A BTU, which is another antique measure but still used, is the energy needed to change the temperature of a pound of water one degree fahrenheit. Unfortunately, because of varying humidity and evaporation, this is not readily related to house air heating or cooling without a lot of assumptions and some computations. Relating this to today's world - the Manuals BayAreaAc referred to account for all these energy conversions and determine an estimated cooling (or heating) requirement for your specific house. The type of construction, solar exposure, general climatic conditions such as average temperatures, humidity, and hottest and coldest normal ambient temperatures and desired inside temperture are all taken into account in the more sophisticated versions of the analysis, so there is no "standard", though a rough old rule of thumb was about 1 ton of cooling per 500SF of house. Obviously, this was a WAG only because it did not account for insulation, type of roofing, whether you live in Alaska or Miami, etc. The ACCA manuals do a very simplified form of evaluation to arrive at a "design", which generally will be adequate. OF course, highly precise calculations are not really needed because A/C units generally come in even ton ratings - so if you are at say 2.6 ton requirement you will be getting a 3-ton unit anyway. SEER ratings are not a direct measure of efficiency, but the relative difference between ratings gives you good idea of the unit's relative efficency in using electricity - so a 16 SEER should be about 19% more efficient (so roughly comparable lower electricity bill) than a comparably sized 13 SEER unit. 13 SEER is the lowest efficiency currently allowed to be built for general use, 19 SEER is about the highest efficiency made by pretty much all manufacturers, and about 25 SEER is the highest rated though very pricey shelf-item units, though special construction custom units can reach about 30 SEER. Note however, like any government sponsored rating, much of it is hooey when you get down to it - for instance, SEER ratings are figured based on 80 degree inside air temp and 82 degrees outside, when that is far from the normal case of mid to low seventies inside and high eighties or above outdoors. This makes the absolute SEER rating meaningless, but relative numbers still have meaning in comparing units. Note these efficiency ratings are for conventional air conditoners and heat pumps working in ambient air conditions. Ground sourced Geothermal or lake/river exchange cooling units, though initially more expensive in most cases, can greatly exceed the air-exchange unit efficiencies because they are exchanging heat with cold natural water rather than with a high-temperature outside air, and instead of continually compressing a gas are just circulating cold water. I worked on one geothermal cooling project which had almost infinite efficiency, which of course makes no sense - but the only power was for sensors and a control valve as the water flow was single-pass under gravity flow, so no power was used to circulate the water.