Furnace not working

[jornvango]

After a long and hot summer, we camped in the mountains last week and wanted to turn on our furnace heater at night. The thermostat clicked but the furnace didn't turn on: the fan didn't start.

Other gas appliances like the fridge and stove work fine on 12V.

I used a multimeter to check all fuses but all seem to be ok. There is no labeling so I don't know which fuse is for the furnace.

Before I call an RV mechanic to come out, is there something else you recommend I check to troubleshoot?

Thank you, Jorn

[smthbros]

Perhaps you reset the flame rollout switch. If so, you should probably verify the integrity of the heat exchanger.

[enblethen]

No, the circuit breakers are normally a small push button.
It could be a safety switch for when maintenance is being done.

[jornvango]

I opened the interior furnace vent and noticed an Off / On-reset button. It was Off. I turned it on and the furnace works again.

Any idea why this button would be Off? It requires a screw driver to open so it's definitely not something I turned Off. Perhaps an RV mechanic when he installed solar a few months ago for whatever reason?

It's an Atwood furnace. Is this the circuit breaker mentioned in an comment above?

[ksg5000]

Have you tried using furnace when connected to shore power? Furnace fan won't start up if you have low batteries.

[enblethen]

Ignitor will not "click" if the fan is not running. Fan must close sail switch before ignitor will work.

[joebedford]

wiggle some wires on heater when you hear it clicking, might be just a loose wire.

X2

[eHoefler]

Wasp nest keeping the blower from spinning, very common

[enblethen]

Verify that the on/off switch on the thermostat is on. If equipped.
Fan should start as soon as the thermostat calls for heat.
Make and model of thermostat and furnace?

[wa8yxm]

You said the fan did not even start......

On an Atwood furnace, of you go outside and remove the access cover you will see a switch atop the blower housing. it is really a circuit breaker, Cycle it.

On the control board is an LED if it is flashing count the flashes and pattern and post.

[path1]

My thoughts, On the surface of your post
Fuses... OK
T-stat...OK

And Propane is making the trip to furnace?

...wiggle some wires on heater when you hear it clicking, might be just a loose wire.

Then if no help...get out the manual and go through trouble shooting check list.

Then RV mechanic