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Old 03-02-2007, 10:47 AM   #1
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Furnace blows cold air

Hi all, we have a suburban furnace with electronic ignition. Until this morning it was working fine. This morning the blower works (blows cold air) but apparently the burner is not lighting - there is no heat either from the vents or outside at the vent/intake.

Any suggestions about what has failed?

I have had a little problem with the thermostat but I assume that if the blower is running, the thermostat is functioning (the thermostat has 2 wires to it).
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Old 03-02-2007, 11:31 AM   #2
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when mine did that, the propane tank was empty and the blower would not go off, so unplugged power and switched tanks, then plugged back in and all worked fine. hope your fix is that easy (well...easy after i figured it out!)
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Old 03-02-2007, 11:34 AM   #3
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Alas, we have propane.
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Old 03-02-2007, 11:45 AM   #4
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On occasion, in my Argosy 20' Class A, I have had to turn the thermostat down a couple time then back up a few minutes later to get it to ignite.

This the first time in a while you have turned up the thermostat?
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Old 03-02-2007, 11:52 AM   #5
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check your voltage at the furnace. If the voltage is loe the fan will not spin fast enough and the sail switch will not engage.

Mark
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Old 03-02-2007, 12:16 PM   #6
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Sail switches also fail, especially in somewhat dustier environments, and usually result in just the kind of symtom that you describe. Sail switches are relatively cheap to buy, but somewhat more difficult to install. What we've found is that the old sail switch can generally just be blown out well with compressed air and expected to live until the next time around. (Our new spare sail switch has been sitting in its original box now for several years!)

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Old 03-02-2007, 12:52 PM   #7
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Quote:
Originally Posted by guy99
Hi all, we have a suburban furnace with electronic ignition. Until this morning it was working fine. This morning the blower works (blows cold air) but apparently the burner is not lighting - there is no heat either from the vents or outside at the vent/intake.

Any suggestions about what has failed?

I have had a little problem with the thermostat but I assume that if the blower is running, the thermostat is functioning (the thermostat has 2 wires to it).
Consider yourself lucky, summer will be here soon and you will want the cool air it is providing.

Thanks Jim
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Old 03-02-2007, 01:54 PM   #8
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Quote:
Originally Posted by Jim Clark
Consider yourself lucky, summer will be here soon and you will want the cool air it is providing.

Thanks Jim
Boy, wouldn't it be nice if it worked that way
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Old 03-02-2007, 03:00 PM   #9
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Just a thought

Quote:
Originally Posted by guy99
Alas, we have propane.
I wonder if it is there & not getting lit. In an unusal move for me, I will jump right to the punch line:

Start up the furnace like you normally do, and step outside to the furnace vent. Do you smell anything other than cold air?

Tom
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Old 03-02-2007, 03:21 PM   #10
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Quote:
Originally Posted by TomW
I wonder if it is there & not getting lit. In an unusal move for me, I will jump right to the punch line:

Start up the furnace like you normally do, and step outside to the furnace vent. Do you smell anything other than cold air?

Tom
Don't smell any propane.
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Old 03-02-2007, 03:30 PM   #11
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Quote:
Originally Posted by guy99
Don't smell any propane.
And this was from the outside vent?

Tom
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Old 03-02-2007, 03:40 PM   #12
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Now, for MY stupid question, did you turn the propane on before trying to run the furnace?
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Old 03-02-2007, 03:40 PM   #13
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Quote:
Originally Posted by guy99
Hi all, we have a suburban furnace with electronic ignition...
Do you hear the electronic ignition "clicking"

Tom
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Old 03-02-2007, 04:19 PM   #14
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Quote:
Originally Posted by TomW
And this was from the outside vent?

Tom
Yes.
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