Furnace blows cold
2018 travel trailer, ducted furnace, one lead-acid battery. Boondocking, on battery
Customer says: The furnace fan runs but it never heats up.
Cold morning. They've been boondocking for four days.
Tests you can run
- Thermostat calling for heat
- 12V at the furnace with the blower running
- Battery at the posts
- Sail switch while the blower runs
- Light a stove burner
- Check the return air
- Run the generator, retry furnace
Repair options
The lesson behind this case
Keep going on furnaces
Learn it
Prove it
- Furnace sparks but never lights
- Furnace keeps shutting off, fan keeps blowing
- Thermostat clicks, furnace does nothing
- Comeback: furnace quits again