Furnace not suppying warm air

[riverrats]

We just dewinterized our trailer and everything is working great. The only thing that is not working is we are unable to get warm air to blow on the furnace. The furnace comes on and blows...just not warm air. Everything else with propane is working great......any suggestions??

[Festus2]

If your thermostat is not set on AUTO this may be the cause. Check to see what setting it is on and if it is on some other setting, move it to AUTO.

[f6bits]

Which model furnace is it? The Atwoods have an LED on the circuit board that flashes codes when there's a problem. Here's a code list:

Internal Circuit Board fault Steady on, no flashing
Limit switch/Airflow problems 1 flash with 3-second pause
Flame Sense fault 2 flashes with 3-second pause
Ignition Lockout Fault 3 flashes with 3-second pause

And here's a good troubleshooting guide:
http://www.rvforum.net/miscfiles/Furnace_Trouble-2.pdf

[CUFFS054]

River, any chance that gas line needs purging?

[riverrats]

the furnace is on auto

we do not have a LED switch board

we will try purging the line again.....

any other suggestions????

[f6bits]

Which model of trailer is this? In mine, if I peek through the intake vent, I can see the control circuit board. Or just remove the grille and get a real good look at the circuit board for a flashing LED.

[SteveC7010]

any other suggestions????
Download the troubleshooting guide that f6bits recommended and look it over carefully. There are some things you can do that are outlined in the document. He also told you where the circuit board is located and how to read the codes.

If you're not comfortable with DIY repairs, it'll be time to get it to the service shop.

[RICNTONI]

make sure there are no rodants nests in the furnace blocking the air vents