Check the levels of propane if the pilot light doesn't stay lit. Make sure that the gas is also turned on. If the levels are low, you will need to fill the tank up.
Check that the thermocouple is aligned with the pilot flame. The flame should be blue with a little yellow. The thermocouple should be 1/8-inch away from the pilot light. Make sure spiders didn't build nests in orifice. If this is the case, use Raid to clean out the orifice.
Check that the battery is charged if the fan runs but there is no heat. Also check to see that all circuit breakers are flipped on. If a fuse is blown, it must be replaced.
Check that the regulator is operating on the propane tank if the fan runs but there is no heat. This means there is insufficient air flowing through the furnace. If it is the regulator, it will need to be replaced or the propane valve on the furnace might need to be replaced. Make sure registers are open and free of spider nests.
Charge the battery if the heat works but dies in the middle of the night. Also check the amount of LP in your tank. It may need to be filled because it will stop running if the gas gets too low.
