We contacted Trademark Mechanical for service on our Carrier Infinity ICS 95% efficient gas furnace with Infinity 19 heat pump which had been installed at our home June 2010 by a different vendor.
Since July 2011, our unit has experienced multiple events of ignition lock out and flame sensor failure during colder weather and during the winter. These events caused the heat pump to activate cooling our home with outdoor temperatures below 35 degrees rather than warming. We had previously contacted another vendor who inspected and serviced the furnace and heat pump for winter and summer usage, with similar lockout events occurring. During service calls on March 5th and 7th, Technician Perrin Renfroe correctly diagnosed the cause for the lockouts, which proved to be low propane gas pressure from our propane tank and incorrect settings for the three-stage heating process in our furnace. Renfroe adjusted the pressure for each stage, installed a new Carrier Touch Control thermostat and we have experience perfect heating conditions since 3-7-2018, 24 - 7! We want to thank Trademark Mechanical and Technician Perrin Renfroe for the excellent customer service and professional analysis of our Carrier furnace which two other vendors were unable to provide. It is a pleasure to work with Perrin who is a credit to his employer providing the very best service to the public not usually found with other service providers. Thank you, Perrin, for the job well done!