I'm having a problem with both Dometic roof units (air/heat pump, 2013 and 2015) and my Suburban propane furnace (OEM, 2002). My thermostat is the Dometic 5-button (previous owner, 2012).
Everything has run as it should for the past five years. About two weeks ago I noticed that my roof units were sometimes running too long. They would both keep running for a while after the target temperature was reached, even when set differently. At first I (and my wife) thought it was my imagination, but then we noticed that the behavior had worsened and become consistent. Whether in heat pump or A/C mode, the roof units would start and operate ok, but then run continuously. I checked and found that the propane furnace behaved in the same way-- it would start in response to the thermostat set point, but would not shut off automatically. All units would only stop if manually shut off.
I have now reached the point where my roof units will not even start. The furnace will start and run, but will not shut off unless it is switched off manually.
I have three units misbehaving in similar ways, two of them powered by 110VAC, and the third powered by 12VDC and propane. The common point I see is the thermostat, so that is where my analysis leads me.
Has anyone had similar problems?
If I just buy a replacement 5-button thermostat will it plug and play? Or do I need to specify particular model numbers of the controlled units? I can find no model or part number at all on the thermostat.
Thanks for the help.
John
Linear Mode
