I have a TT Prestige 110 installed 2012 that has had annual service by the installer and has worked well. This winter the unit has stopped working and does not respond to call for heat from the thermostat. It appears to be frozen and an "A" code is on the display. I can get it to work by hitting the reset button and it cycles normally and works for about 24 hours and then freezes again. I have had two service calls and they can't seem to find the problem. They have checked the heat exchanger, ignitor, and motherboard with the manufacturer on the phone, but no luck. They have suggested changing the controller out. Right now I am keeping the house warm by hitting the reset button when it stops working. Thanks for your help.
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