Join Date: Mar 2007
Location: Northwest Ohio
Feedback Score: 0 reviews
Re: Trailer heater quit working
Don't believe your thermostat is bad. The fan would not have started if it was. The fan starts and blows for about 10 to 20 seconds to purge any gas (leakage) in the combustion chamber so it won't explode on regular ignition. If you have'nt had the propane turned on for some time, it may take 5 or 6 tries to get the air out of the system. Most all furnaces after 1997 have 3 try electronic boards in them. The best way to purge the air out of the system is to light the stove if you have had the propane shut off for a couple of days or more. What make furnace do you have ( Suburban - Atwood Hydroflame ) Does your thermostat control both the furnace and Air conditioning. All RV DSI (direct spark ignition) furnaces operate this way. Thermostat calls for heat -- fan turns on for purge cycle-- purge timer times out--(if the sail switch is made) gas valve opens & spark ignition fires--if ignition does not occure within 5 seconds gas valve shuts off--there is no thermocouple on this type furnaces, only a flame sensing rod that gets red hot. If the furnace requires you to light a pilot, then it will have a thermocouple and still go thru a similar cycle, if it did not light fire off, this type, If your 12VDC is low (10.5VDC) the fan is not running fast enough to make the sail switch, then no ignition will occure on either type furnace. On a furnace with a 3-try board it will go thru 3 cycles with 10-15 seconds between ignition for purging, fan will continue to run until thermostat is turned off, then back on to repeat the cycles. Listen for a click (gas valve opening) if not heard then the valve is stuck,defective or the board is defective, assuming the sail switch is made.
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