Furnace Won't Start After Running Out Of Propane. Without a generator, however, this is unlikely. It’s even more frustrating when you can hear the heater clicking on.


Your thermostat may have reset when the power went out, or your thermostat could be on a schedule to keep your home cool. The internal furnace switch wont let the furnace ignite resulting in less heat. The most obvious and noticeable effect of a propane tank run out is the inability to fuel any of your appliances or heating.