Why does my furnace only work on shore power?

It's a battery or converter problem, not a furnace problem — the blower needs solid 12V to spin fast enough to close the sail switch.

Do you service Suburban and Atwood units?

Yes, both, along with the common Dometic controls and thermostats.

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RV Furnace Repair

Ignition failures, blower motors, sail switches and thermostats.

(936) 727-3066

Winter here is short and sudden, which means furnaces sit unused for eleven months and then get asked to run all night during a hard freeze. Mud daubers in the burner tube, a lazy blower and weak battery voltage cause most of the no-heat calls that come in the week the first cold front lands.

What's covered

Ignition sequence testing and lockout diagnosis
Burner tube cleaning and insect-nest removal
Blower motor and squirrel-cage service
Sail switch and limit switch replacement
Circuit board and thermostat repair
Ducting corrections for cold rooms
LP pressure verification at the furnace

Symptoms we hear

Blower spins but the burner never lights
Furnace lights, then quits after thirty seconds
Repeated clicking with no ignition
Heat only reaches half the coach
Furnace won't start unless plugged into shore power

Around Conroe specifically

The freeze warnings that hit Conroe every couple of winters bring a rush of no-heat calls in the same 48 hours. Testing the furnace in November instead of January is the difference between a scheduled visit and a cold night.

Towns and parks covered