Suburban furnace issue

It sounds like a relay that would supply the 12 volts to the fan and control board. The thermostat only powers the relay armature which in turn closes the contacts that connect the power to the furnace.

softballjunky wrote:
For what it is worth, After it cycles off and I turn the unit on and off at the thermostat there is a clicking sound coming from the furnace. Not the kind of sound that happens over and over as it tries to ignite but just a single sound as I turn the switch on. Does that give you any further information? Thanks

I am not an expert. Just another RV owner like you. If the furnace was overheating then it has a overheat switch built in. After if shuts off on that the switch has to cool down before the furnace will restart. The clicking sound is the relay trying to turn the furnace on just like was stated above. But, it can't run because the overheat switch has not cooled down enough yet to automatically reset.

Again, I don't know for sure but, I still am guessing it's full of dirt from the wasps. That is why it is overheating. It can't "breath" good enough and exhaust the burnt gasses so it overheats and shuts off.

When you say it shuts down after 5 minutes does the burner and fan shut down? Or does the burner shut down but the fan continues to run until you turn the thermostat off?

Are you plugged into shore power when this happens, or are you running off the battery alone?

Is there black soot on the outside of the trailer around or above the furnace exhaust port?

Can you find and tell us the model number of the furnace?

Do you have a digital multimeter to be able to take some readings?

Does your thermostat control only the furnace? Or does the thermostat control the furnace and the AC?

Here's a good solution to keep wasps and fly insects out of the furnace intake and exhaust