Furnace issue

[David D]

I have a 2013 343rl model. When I turn on furnace at wall thermostat it won't blow air hot or cold out of the floor registers. I've checked fuses in fuse box and none are blown. I also can't seem to find the furnace itself.

[Mikendebbie]

This is your furnace…

[RMcNeal]

A few suggestions...
Make sure propane is turned on and has good flow. You can light a burner on the stove to check this.
Have someone turn on the furnace at the TStat while you stand outside next to the furnace (shown in picture above). Listen for air clicking sounds, etc. to determine if the furnace is even trying to light. The fan will run for a few seconds before it will allow ignition as a safety measure. If it lights, you'll hear something akin to a jet engine revving in the area of the exhaust port. That's normal.

[Kyle and Lisa]

You should still get airflow momentarily, remove basement wall and check duct work, when our rig was new the duct going to the bathroom had a large hole in it.

[Mikendebbie]

If you think it is the thermostat - figure out what the thermostat model number is and search for replacements. I looked at a sales video of a 2013 model like yours and it had something similar to the thermostat below. If this is the correct model at $199 - you should consider a MicroAir thermostat for $245 or so. I have replaced my OEM thermostats with MicroAirs like many others here on the forum.

[Foldbak]

If there is no airflow it could be the thermostat as Mike said but it could be several other things as well. Power to the motor, the motor itself, wiring, control board, etc. Check the link below


https://www.rvrepairclub.com/video/r...erview-018968/

[David D]

Stove lites and I have listened to furnace with tstat in on position and all I hear is a faint buzz, that's all I hear. There is also a red blinking light on the board. And that is the tstat I have minus the heat pump setting. Is it possible it could be the battery because I'm also having problems with my slide outs not sliding in or out, my stabilizers not extending or retracting and my awning not extending or retracting?

[RMcNeal]

Furnace definitely requires 12v DC power, so it could be related. Are you on shore power and does your converter supply 12v DC?

[David D]

Yes I am plugged in. I live in my unit and the furnace used to work. I don't recall doing anything to cause the problem I'm having. I do have a separate freezer inside, but I've always had it so I don't think it's the cause.

[RMcNeal]

Sounds like the fan motor is not working and that will cause the furnace not to fire since the sail switch is not activated. Is the fan frozen? Can you turn it by hand? Can you check to ensure you actually have 12v DC at the fan motor?
This troubleshooting video may help.

https://www.youtube.com/watch?v=yjTbZEs5VwI

[RMcNeal]

There is also a generic troubleshooting guide in the files section that may be of some help.
https://www.montanaowners.com/forums...?do=file&id=11

[Foldbak]

If you're having slide problems then it could be your batteries. Your heater like your slides work on 12volts. If the batteries are bad and overworking the converter you wont have the power you need.

[David D]

I will check the things you've mentioned. Thank you all for your input.

[pitman44]

Originally Posted by David D

Stove lites and I have listened to furnace with tstat in on position and all I hear is a faint buzz, that's all I hear. There is also a red blinking light on the board. And that is the tstat I have minus the heat pump setting. Is it possible it could be the battery because I'm also having problems with my slide outs not sliding in or out, my stabilizers not extending or retracting and my awning not extending or retracting?

You mention "a red blinking light on the board." Where is that board located? If on the furnace, that's an error code. Count the number of blinks. They should repeat.

[Wycomike]

Originally Posted by pitman44

You mention "a red blinking light on the board." Where is that board located? If on the furnace, that's an error code. Count the number of blinks. They should repeat.

There should be a sticker/label on the fan motor with the troubleshooting legend for the # of flashes. I have attached a picture of the one of my furnace.

[David D]

Yes it is at the furnace. I will check that and thank you for your input.

[David D]

It has been determined my furnace is indicating an air flow/limit fault code based on the red blinking light on the board at the furnace. When I turn furnace on at tstat nothing happens not even blower turns on. Can this be bad sail switch?