Furnace blowing cold air

[Pcowan1213]

My furnace is blowing cold air only. Propane system. Fan comes on and thermostat seems to be working. Any suggestions? Imagine 2970RL

[NB Canada]

Some more info would be helpful

When is the last time it has worked?
Out of propane?? Full tank???
What kind of thermostat and is it on auto

[Redapple63]

Agree additional info:

Model and type of heater.

Bill

[Scott'n'Wendy]

Do you hear clicking like the ignitor trying to light off the burner? If you do, lack of propane. Get some.
If you don't, lack of air movement. Sail switch or something in the flue. Check/clean flue, check sail switch.

And agree with previous posters. More info would be helpful.

[Pcowan1213]

Was out of propane! Thought I had another day or so before I ran out but guess not. Changed tanks and works like a charm. New to RVing but I’m learning!

Thanks for the response.