Dometic Heater Thermostat issue?

[dartmouth01]

Hi all, I have a digital Dometic thermostat that controls heat and AC, and when I try to use heat now, it works until it needs to turn on again because min temp is reached.  I can hear some relay sounds in the overhead AC strangely enough, and the heater blower starts up, but there is no ignition.  I can trigger ignition by taking the desired temp up another degree.  Any thoughts on what might be the root cause of the issue?  If thermostat, I'll probably go for a microair replacement.  Thanks!

[Wrknrvr]

We need a picture of your thermostat 

 if you look at the instructions about the thermostat installation it describes  how to initialize the system for startup of the thermostat. Just repeat that sequence and see if that works.

[Kirk W]

When a thermostat is shared by the air conditioner and the furnace it is normal for the signial to go from the thermostat to a control circuit board that is located in the air conditioner. That circuit board takes the signal from the thermostat to know if you want heat or cooling and then sends the request to the appropriate appliance. If you don't have the operator/installation manual, let us know what model Dometic thermostat you have and we can probably point you to one. 

[dartmouth01]

Thanks, it is this thermostat, with the awful capacitive touch buttons (I know, I need to reach out to Dometic to get the updated covers).  I think I will swap the thermostat from the bedroom to the living room first, to see if I can isolate the issue to the thermostat itself.

Edited November 3, 2022 by dartmouth01

[Wrknrvr]

Press the “+” button and, while holding it, also press and hold the On/Off Mode button for three seconds. LCD will show ― ― . Press the On/Off Mode button again to turn system off. This completes the initialization.