Furnace working intermittently

Sounds to me could be a relay delay or maybe a bad motor it's probably been a while since it's been out of the RV anyway it wouldn't hurt to have that Suburban cleaned completely and checked out by a tech intermittent problems are the hardest to find

Sounds to me could be a relay delay or maybe a bad motor it's probably been a while since it's been out of the RV anyway it wouldn't hurt to have that Suburban cleaned completely and checked out by a tech intermittent problems are the hardest to find

So tried again today. Outside temperature almost 80. Fan comes on no problem but now it won't ignite. Will try wiggling the wires and if that doesn't work, I'll remove it and take it into a RV shop.

While it might be a loose wire, checking isn't going to hurt. It's quite possible it's the control board inside the furnace.

When you have an intermittent connection, the more often you attempt to light the furnace, the more often it will work or not work. Seems pretty obvious now that I type it.

The wires that I said to wiggle are behind the exterior furnace door around the gas valve. I'm pretty sure they're all low voltage so no chance of electrocution. Wiggle the wires until the furnace comes on.

On my rig, I pulled every furnace connector off and used pliers to tighten up the females a bit. Probably just pulling off and reinstalling cleaned the connection enough to get rid of the intermittent but tightening can't hurt.

In response to the last question
During the middle of the first cold night the furnace stopped working while we were asleep. We could not get it to start up again though we played with the on/off switch and the temperature control switch on the thermostat. In the morning we got it working again for a while by sliding the temperature control back and forth. Then after a while it stopped working again. I noticed that if I moved the temperature control switch below room temperature and then slowly moved it to the current room temperature I would hear the slight click at the thermostat and a louder click at the furnace but the fan would not come on. Once I got the furnace fan to come on I would get ignition. So the intermittent problem is that the furnace fan will sometimes not come on. We were hooked up to shore power at the time. It would seem that the colder it was outside, the more prone it was not to work. I am now at home and the outside temperatures are way up again. The furnace now works flawlessly now that we don't need it.

What exactly is happening?
Is the furnace starting, including heat?
Is the blower just running?
Do you need to turn the thermostat off to restart the heat?

Likely a tiny wire between there and here that has corroded or fallen loose. When you deal will millivolts, they all want their space and connection. As Joe says, wiggle the wires. All of a sudden, things will light up.

Wiggle the wires.