Prior to performing any maintenance or troubleshooting on the furnace, turn the furnace switch off to prevent the system from engaging.

Regular inspection of the furnace system will help to promote reliable and trouble free operation. At least once per quarter, remove the outside access panel and examine the area for insect nests or road debris that can restrict airflow. Clean the outside access using a vacuum or air compressor.

Return air vents inside the RV must be regularly cleared of lint and pet hair to prevent build up that can affect the blower motor. Removing the panel to access the return air grill generally requires squeezing the side clips, or on some model motor homes, taking out screws installed in the frame.

Adequate airflow is crucial to insure proper furnace operation. Never store cargo around the furnace housing or on top of ducting. Do not obstruct the return air grill panel. Reduced airflow can result in overheating the system.

There is no filter to monitor on the furnace system, and from time to time the question will come up whether it is possible to add a filter than will minimize cleaning and maintenance. Specific air flow is required for proper furnace operation. It is strongly recommended that after-market filters are never installed.

If the blower motor fails to run, or operates slowly, check battery voltage. The furnace requires 11 volts. A lowered temperature setting or faulty wiring at the thermostat can also prevent the blower motor from engaging. A fuse located in the house panel should also be checked when troubleshooting a potential voltage problem with the furnace system.

The burner ignition is the spark plug of the furnace system. Over time carbon may build up and require cleaning with a wire brush. Malfunctioning at the burner can occur from low gas pressure. More gas is required to run the furnace during colder temperatures. Keep propane tank levels above half, and reserve propane for the furnace when hooked to shore power by running the refrigerator and water heater on electric.

A sail switch in the system controls electrical current through the furnace circuit board. Low voltage will prevent the blower motor from spinning enough to close the sail switch and that will prevent the furnace from operating. Low voltage can be created through weak batteries, insufficient shore power supplies, or a tripped breaker in the RV or at the shore power post. Turn off the system at the thermostat and confirm power, or start the generator, before turning the thermostat back on.

Outside cargo doors should remain closed when the furnace is in operation to prevent potential damage to the paint from burner heat.

Schematic »

Diagnostic Chart »

Vent Layout »