Dometic furnace wont start in command

[Rmbrumley]

Hopefully somebody can help. A/c’s run fine , change to heat on incommand and no furnace operation. Few calls to in command they say gate way bad….replace gateway same problem. I jumped the blue thermostat wires at the furnace and furnace wires up and works fine. I’m about to buy a manual thermostat and run my furnace from there instead of through incommand system. Any thoughts? When I switch from a/c to heat I hear a relay click in rear a/c unit which is normal but the a/ c is not telling the furnace to turn on. Any help would be appreciated.
Thank you

[Pharphr]

I was going to install a regular thermostat as a backup to the iN-Command just in case something like what happened to you, happened to me. I have an Emerson thermostat that would have worked. Not sure of the part number. Its in the trailer now. I can look tomorrow if that will help. Like you already know, the furnace starts when those wires are shorted.

[ChuckS]

Since you haven't stated year,make,model of your TT NOR the brand of A/C unit I will guess at your issue...

The gateway isn't what is causing the issue for that Zone ( rear A/C ) to not turn the furnace on..

Instead you need to look at the CONTROL BOARD for that A/C unit.. there is a relay that controls the two blue wires ( Signal Wires ) to complete the circuit so that the furnace mounted control board knows to turn the furnace on

[Rmbrumley]

ChuckS

2019 Keystone 361RLW with Dometic a/c and Dometic furnace, replaced gateway already. When I change the a/c to Heat at the panel I do hear a relay click at the a/c unit that controls the furnace. I made sure the dip switch setting was same as old gateway #2 is on . Any thoughts or ideas or wiring diagram would be appreciated.