I would start by checking your 12 volt battery voltage, should be 12.5 to 12.8 voltage reading, as with out it the heater will run briefly and then shut down. There are many factory trouble shooting guides on line for free. Not sure if you have a ATWOOD Suburban heater?
Normally if the fan motor comes on... it blows against a flat plate called a flail switch. That switch tells the ignition device to give spark to the GAS CHAMBER. So my guess is....with your start stop condition....the the electronic control is not working correctly due to low battery voltage. As you said....when on 120 volts going to the 12volt invertor...things work correctly. Lots of information on U-Tube on furnace troubleshooting! Good Luck Goodn
Don't mess with it just bring it to the dealer that you bought it from
SOURCE: How do I winterize my 2015 Jayco Jay Flight 32 RLs
Go to an RV parts store for a winterizing bypass kit for the water heater. Use POTABLE RV antifreeze and follow the instructions on the bottle. Drain all the water out of the water tank. Install the bypass kit on the water heater if it doesn't already have one. Put the water heater in the bypass mode. Add the antifreeze to the water tank. Open every water faucet including the shower head one at a time until antifreeze is present. Do this for hot and cold on every faucet. Once that is done, turn off the water pump and open all the faucets. That's all there is to it. Rember... DO NOT use automotive antifreeze. It will kill you.
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