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Old 10-29-2015, 08:18 PM   #4
billr
Senior Member
 
Join Date: Jan 2006
Location: Ontario Canada
Posts: 857
I recently had an issue with our furnace in the mobile suite. It would short cycle. Run for mayby 7-10 min but no where near target temp. Furn shuts down About 2 min later fires back up and runs 2 min and shuts down. Continues this

I have Dometic two zone with remote sensors two heat pumps.

Tried a spare Dometic thermostat no fix.

Disconnected the two blue wires from the furnace at the furnace and connected them together. Furnace started right up. Ran until I disconnected them. This eliminates the temp control from thermostat some remote sensors. I now suspect the remote sensor.

As a temp fix I ran new wires from the blue wires to furnace upstairs and installed a simple non powered thermostat on the wall in hall to bath.

Works perfect. I may just leave this in place as perm fix. I like the heat control way better. The sensor by back window drove the heat too hot night in bed.

Your issue may be caused by the temp control in trailer. If you fire the furnace by connecting the wires and it stops when you disconnect them the furnace is fine.

Note the furnace goes through normal start up and shutdown with cool down using the manual control.
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