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Old 03-15-2011, 11:40 PM   #1
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Furnace ignites a few seconds then quits

I'm having an issue with my Suburban furnace in a 77 Sov. I apologize as I'm not sure as the model number on it. However when I kick my furnace thermostat up the blower kicks in and I have a good flame in the chamber for about 10 seconds then the flame dies out and it blows cold again. I bled the propane system best as I know how and I don't believe it is a supply problem. I'm wondering if it maybe a thermal switch but am not real sure if its located on the inspection plate or further inside the camber to test it. If anyone could give me some insight I'd appreciate much. Thanks.

Corey
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Old 03-16-2011, 06:28 AM   #2
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Could be just a cleaning issue. Can you get a picture of the ignition, burner area? There should be some type of flame sensor in there that probably needs cleaning. If you are not comfortable taking this apart or working with gas then you should take to a shop.
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Old 03-16-2011, 07:37 AM   #3
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Sounds like the sail switch.
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Old 03-16-2011, 09:54 AM   #4
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First I am not an expert on Suburban furnaces. But do know enough to know that messing with propane furnaces if you don't know what you are doing is not to be taken lightly.

I had similar problems with a burnt out electrode and cracked asbestos gasket. These are located in the front of furnace after you take off the cover. Both parts are relatively cheap and easily accessible.
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Old 03-16-2011, 08:32 PM   #5
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Thanks for the ideas. I will try to clean the old girl up try again and post the results.
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Old 03-16-2011, 08:49 PM   #6
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10 seconds is a short period of time for the high limit switch. The sail switch has to make before it will light at all. And 10 seconds is a short time for a defective thermostat.

Even give that I would jumper the thermostat and see if it will run longer than 10 seconds. I say this because I have seen thermostats that would cause short cycling. I had to shim mine further open with a piece of match book cover to get it to stay on for a reasonable time.
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Old 03-16-2011, 09:57 PM   #7
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Even give that I would jumper the thermostat and see if it will run longer than 10 seconds. I say this because I have seen thermostats that would cause short cycling.
Ditto that. Replacing the old thermostat stopped short cycling for me. You can use the cheapest Wally world thermostat you can find, but make sure you can adjust to low and high on/off level. It will probably say 24v but does not matter. Polarity does not matter. Just disconnect the thermostat and cross the 2 thermostat wires and see if she stays on.
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Old 03-17-2011, 08:20 PM   #8
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In your experiences with faulty thermostats did the blower keep running as well? MY blower keeps on truckin' even after the fire goes out in the chamber. I will try to cross up the wires on the stat though.
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Old 03-17-2011, 09:59 PM   #9
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In your experiences with faulty thermostats did the blower keep running as well? MY blower keeps on truckin' even after the fire goes out in the chamber. I will try to cross up the wires on the stat though.
The control board controls the fan and even after the thermostat opens the fan is kept running for about 30 seconds as a PURGE CYCLE to cool the heat exchanger.

Just as there is a 15 second purge cycle before the flame is lit to prevent an explosion.
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Old 03-17-2011, 10:16 PM   #10
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Could be the regulator valve on the furnace is dirty and providing irregular supply of fuel, and the board may be shutting it down.
Would suggest a complete cleaning and tune up.
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Old 03-17-2011, 10:24 PM   #11
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A furnace from the 70s does not have a control board, at least mine does not. It has a relay and several switches. The fan runs if the thermostat is turned up and the contacts close. It does not care if there is flame or not.

The sail switch, fan switch or limit switch could be defective. All of these are needed to hold the gas valve open.
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Old 03-17-2011, 10:29 PM   #12
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Corey read this thread before spending any time trying to fix your furnace. It should be pulled and inspected first.
http://www.airforums.com/forums/f427...ace-75112.html
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Old 03-20-2011, 06:14 PM   #13
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Just a quick note, I did cross the thermostat wires with no different result. I do believe I will pull it and inspect and clean it. Thanks for all the suggestions and tips.
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Old 03-20-2011, 06:19 PM   #14
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OK if the thermostat is no the cause of the short cycling check the Proof of Flame system. Something is telling the control board that proof of flame was not seen and thus the gas valve is closed.
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