Furnace keeps shutting down

[Dooley]

We are currently in Colorado and the temps are in the 20 -30F range at night . This problem just started . Furnace runs for a while and then the lights go out and the furnace as well . The coach resets itself everything comes back on , 10-20 minutes later does the same thing all over again.

2015 3510 RE Alpine
Batteries replace 5 days a go
Plugged in to 110 20 amp breaker
furnace seems to be cycling quite a bit and i am using a lot of propane.
Bought this four season coach as I live in Alaska , and this the first time in cold(kinda)weather, I would be Leary about taking this out in the winter at home .

[PerryB]

It sounds like you're losing your supply power. Check all the battery connections, thats my first suspicion. Next open up the DC side of the panel and check the buss feed connections, where the two big 12v wires (usually 6 ga.) connect to the 12v buss bars. Also see if your trailer has a master circuit breaker in the 12v feed between the battery and the panel. If present it will be an auto reset type. Change it and carry a spare. They're only a few dollars (auto parts store) and often become problematic after they've been tripped a time or two. A friend recently went through this on his Holiday Rambler.

[PerryB]

I just had another though, and forgive me for a stupid question, but is your battery switch on? Go check. If its off but you're plugged into shore power, you'll still have 12v in the house from the converter. The draw of the furnace may be pushing the converter up to its thermal limit and its tripping off.

[scott24]

What size are the LP tanks? Another possibility is there could be a pressure drop causing the furnace to shut down.