Replacing Analog Thermostat on Dometic Furnace

[flatland-FRF]

I have a 2018 Coachmen Freelander 20CB with a Dometic propane furnace and the standard analog thermostat for the furnace only.


I purchased the Dometic Standard CT Single Zone digital thermostat to replace it.


When I pulled the old one I found it only has two wires to control the furnace but the digital thermostat has three connections. I tried connecting just two wires (pos and negtive) and the furnace starts, cycles, shuts off and then restarts right away. I get error code E1 as well (Loss of communication)


Can the new digital thermostat be configured for a two wire system? I can't find any diagrams for it and the thermostat only comes with user instructions, not wiring diagrams.

If this one will not work, is there a digital thermostat that will work with the two wire system?


Thanks,
Charlie

 

[Capacitor]

I replaced my analog thermostat with this one:

https://www.amazon.com/Honeywell-TH...&sprefix=digital+rv+thermostat,aps,257&sr=8-3

I don’t know what the third wire is for, maybe a two speed fan.

Edit: looks like the dometic is for heat and cool.

 

[flatland-FRF]

I just ordered that one yesterday, thanks.


With further research I found the third wire is listed as "Comms".


I'll return the Dometic CT and use the Honeywell.


I appreciate the response.