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 12/8/2009 10:42 AM
 

Hi All,

I have a 2006 Cougar 298EFS Fifth wheel with Surburban Low Profile 30,000 BTU furnace. The furnace won't light. The fan runs and I can hear the electronic igniter working but it doesn't light. Did the same thing last winter and I replaced the gas regulator on the propane tanks last spring and it worked fine but now that the cold weather is here it won't light again. After a while the fan shuts down even though the wall thermostat isn't turned off. I know there's gas in the tank. Where do I start?

Thanks in advance.

Ron

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 12/8/2009 11:13 AM
 
 Modified By RVA  on 12/8/2009 12:18:27 PM

Ron - I'd start with the sail switch, and you can read about its function HERE. Before you start taking anything apart, start the generater or connect to shore power and see if it still won't ignite. With the generater running, or a shore power connection, the battery voltage will be increased which will tell you whether it's a low-voltage problem. Good luck. - Dave

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 12/8/2009 2:27 PM
 

Thanks Dave for the response. I read about the sail switch from the link you provided. I'm hooked to shore power already. I see the sail switch is an electrical switch but does is control whether or not the igniter operates? I hear the igniter working but it just won't light. Do you know if the sail switch controls the igniter as well as gas flow?

Thanks again,

Ron

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 12/8/2009 2:55 PM
 

Ron - I don't know if the sail switch controls both the igniter and the gas valve. I'm guessing, however, that there may be a safety reason for not controlling the igniter. For instance, if the igniter portion of the sail switch circuitry failed, maybe there could be a scenario where the gas valve could allow gas to flow, but the "killed" igniter wouldn't be available to ignite it. Just a guess. You might want to contact Suburban for the answer. Good luck. - Dave

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 12/9/2009 10:41 AM
 
Ron, I would check the flame sensor. the part in the flame gets a residue buildup on it and it cannot conduct an electrical current. use a VERY fine sandpaper and wipe it clean with a cloth.even if it looks clean, try to clean it anyways. the part in the flame looks like thermocouple, but it will have a wire going to the control board. good luck, it is getting cold here.

mike
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 12/9/2009 3:26 PM
 

Thanks Guys for the response. Cold here too in Northwest Oregon. It was 9 degrees here this morning. Too cold to work on it. Got the little electric heater running out there for now hoping to get by before something breaks. I obviously didn't get around to winterizing like I should have.

I'll try your suggestions when things wrm up a little.

Thanks again.

Ron

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 2/11/2010 5:35 PM
 
Ron, just wondering if you ever got your furnace working and what you found.

mike
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 2/12/2010 11:39 AM
 

Actually I haven't. Too many other things to do. I should be able to look at it in the next month or so.

Ron

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 3/2/2010 7:50 PM
 
Ron, I went to a furnace seminar at Lazy Days in Seffner,Fl. today. forget what I said about the flame sensor. he said that the igniter wire is also the flame sensor, so if it sparks it should be ok. also the sail switch should be ok because it has to operate before the igniter will spark. so now it seems that you are still not getting gas. along with other things the circuit board opens the gas valve. if you can find the wire going to the gas valve you can check for voltage when it is supposed to be there. they can bench test the board, but you need the proper tester, not just a volt ohm meter. he also said a common problem is dirty contacts on the circuit board and could be cleaned with a pencil eraser, not sand paper, pocket knife or anything like that. cleaning the contacts on the board is probaly the first thing I would try. good luck.

mike
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 3/5/2010 1:57 PM
 

Very Good information. Thank you!!!

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