Originally Posted by Sharpies5
Gas is on! Water heater and stove work fine!
Battery charged or TT plugged in? Thermostat set to heat or furnace not fan? Just thinking of the obvious.
Quick search found this. Hope it helps.
Fan runs but no heat.
If your furnace fan starts you can assume that the thermostat is working.
Possible problems are insufficient air flow through the furnace a bad propane valve at the furnace or a bad regulator at the propane tank.
A furnace contains an internal sail switch, that senses the air flow. If the air flow is not sufficient then the switch will prevent the furnace from igniting and the fan will run but you will get no heat. A slow motor speed could be caused by a low battery or other low voltage cause such as a bad connection in the wiring.
Low air flow could also be caused by a restriction in the ventilation system. Check to see if any heat registers are closed or blocked. Some furnaces will not tolerate even a partial closure of a heat register. .
If you have an electronic ignition check to see if the two contacts are touching or are too far apart. They should be about 1/8 apart.