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Old 11-11-2007, 01:24 PM   #1
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Question Furnace Won't Fire/ Start

Hi All,

I have a problem here. I have a 2005 28 foot international. Problem is the furnace wont start.

Background: was working fine one week ago. Brought it home and parked it, left the furnace on 50 to keep it warm enough for the de humidifier to dry it out. Came out the next day and not heat. The propane tank is not empty, I checked all the fuses and they are intact, no breakers are tripped.

When I adjust the thermostat, I dont hear that click right before the heat turns on.

Any suggestions before I bring it to AS to have a look?

Thanks,

John
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Old 11-11-2007, 01:42 PM   #2
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Propane Leak Detector active?

Couldn't quite tell from message if adjusting up thermostat starts the fan, but no click for ignition of burner, or if thermostat has no effect on furnace...

Propane leak detector has to be on and working to let propane get to unit to fire burner. Without proper funciton, fan might run as part of start sequence, but that is all. Next possible failure mode is sensor for fan operation, which is paddle that moves with flowing air to trigger gas and spark for burner firing..

Might also be a voltage sensitive circuit in furnace, that won't launch if voltage drops from weakened battery. Battery might be able to light interior lights, but 24 hours of running the furnace will essentially drain it, and problem might be in battery charge circuit also, or battery might be out of electrolyte...
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Old 11-11-2007, 03:06 PM   #3
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Here is what I know

I was unable to start the furnace even with the RV hooked up to shore power so I doubt it was an electrical power issue. The fan does not even start, usually the fan turns on and the furnace lights later but nothing.

Thanks for thinking about this.

John
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Old 11-11-2007, 03:24 PM   #4
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Quote:
Originally Posted by jnerges
I was unable to start the furnace even with the RV hooked up to shore power so I doubt it was an electrical power issue. The fan does not even start, usually the fan turns on and the furnace lights later but nothing.

Thanks for thinking about this.

John
John,

You might have a bad thermostat, assuming that you do have 12VDC going to the furnace. Even if they don't ignite, they usually will kick the fan on.

Here's what to do:

Remove the t/stat cover and then unscrew the t/stat from the wall. Locate the 2 blue wires, fashion a jumper wire and put it across these terminals. What you are doing is by-passing the t/stat and giving the furnace the signal to start. There is always 12VDC going to the furnace, and the t/stat simply acts as an on/off switch by completing the circuit with these 2 blue wires.

If the furnace blower comes on, leave the jumper in place and the furnace should fire with-in 30 seconds. This tells you that the t/stat is bad and should be replaced.

Let us know how you make out with the trial.
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Old 11-11-2007, 04:45 PM   #5
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Trust but verify

Quote:
Originally Posted by Condoluminum
...Propane leak detector has to be on and working to let propane get to unit to fire burner ...
I can believe Condoluminum's statement. It makes good sense, and is technically easily achievable.

Would anyone care to confirm the statement?

Thanks,
Tom
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Old 11-11-2007, 08:28 PM   #6
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I think the part about the propane leak detector has merit. Now where is it again? Is that at the bottom of the fridge with the little white button? I pressed it for a few seconds and it honked at me.

John
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Old 11-11-2007, 09:27 PM   #7
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Lewster, thanks so much. I pulled the Tstat off, removed the two wires and connected them to each other. The furnace turned on, heat came on, all was good. I re connected the T Stat unmounted and pressed on each component. The on off tab at the top of the T Stat was the problem. Once it was in better placement, the TStat worked normally. Thanks.

Here is another reason why I am so grateful for the advice. See the Border Collie in the Avatar? He has Prostate Cancer and had to go to Pullman, 300 miles from here for treatment. We use the Airstream as temporary housing for the trip. Found out the Cancer has moved to his lungs so all we can do is make his last days/weeks/month or so as happy as he has made us.

Thanks very much.


John
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Old 11-12-2007, 06:40 AM   #8
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Good Call Lew !
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Old 11-12-2007, 06:53 AM   #9
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Thanks!

John,

Sorry to hear about your pooch . It's so tough to loose a furry friend. Hope you'll be OK!
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Old 11-12-2007, 10:51 AM   #10
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I assume "propane leak detector" is the same as a "gas detection unit", which is what I have located in my Airstream just inside entrance door near the floor. Anyway, you say it has to be on and working to let prepane get to unit to fire burner. I have had my gas detection unit turned off, and my furnace continues to work. It also beeps when I turn it to the on position.
Like I say, I am not sure that my unit is what you are referring to when you say propane leak detector.
I am worried now that I may have a leak. Thanks for any advise!
Tom.
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Old 11-12-2007, 05:53 PM   #11
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Tom,

Some LP leak detectors are 'local' and work like a smoke detector.......they just make noise when they detect an LP leak or fumes. Other are wired into a gas solenoid valve just downstream from the LP tanks and will close the valve at the slightest detection of any LP, thus eliminating the possibility of a 'situation' and blocking the flow of LP to any of the appliances.

If your LP system still works with the detector off, you probably have a 'local' variety.

Quote:
Originally Posted by Sovereign86
I assume "propane leak detector" is the same as a "gas detection unit", which is what I have located in my Airstream just inside entrance door near the floor. Anyway, you say it has to be on and working to let prepane get to unit to fire burner. I have had my gas detection unit turned off, and my furnace continues to work. It also beeps when I turn it to the on position.
Like I say, I am not sure that my unit is what you are referring to when you say propane leak detector.
I am worried now that I may have a leak. Thanks for any advise!
Tom.
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Old 11-12-2007, 06:48 PM   #12
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Still looking for confirmation

Quote:
Originally Posted by lewster
...Other[s] are wired into a gas solenoid valve just downstream from the LP tanks and will close the valve at the slightest detection of any LP...
Does anyone know if Airstream wires this way?

Tom
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Old 11-21-2007, 11:57 AM   #13
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Quote:
Originally Posted by jnerges
Lewster, thanks so much. I pulled the Tstat off, removed the two wires and connected them to each other. The furnace turned on, heat came on, all was good. I re connected the T Stat unmounted and pressed on each component. The on off tab at the top of the T Stat was the problem. Once it was in better placement, the TStat worked normally. Thanks.

Here is another reason why I am so grateful for the advice. See the Border Collie in the Avatar? He has Prostate Cancer and had to go to Pullman, 300 miles from here for treatment. We use the Airstream as temporary housing for the trip. Found out the Cancer has moved to his lungs so all we can do is make his last days/weeks/month or so as happy as he has made us.

Thanks very much.


John
John, sorry to hear about your pup's condition. Hope you and he can enjoy together whatever time he has remaining.
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Old 01-19-2014, 10:37 PM   #14
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searching forums, found this thread...it appears my unit right now has this problem...I tried reseting thermostat...nothing....turned on, no fan kicks on, no furnace...no clicking....

my unit is a 21014 bunkhouse.
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