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Author Topic: Furnace blower works, but no heat  (Read 1046 times)

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Offline rt749

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Furnace blower works, but no heat
« on: September 28, 2012, 01:50:08 PM »
1997 Coleman Fleetwood Bayport.  Owned it for a year.  Slowly working on getting all of the parts and pieces to work right.

I need some more help!  Since I installed my new converter and new battery I can get the furnace blower to work, but no heat.  There is a pilot that I assumed was for the refrigerator.  I can light it, but don't see anything that resembles a furnace burner.
We are planning to try winter camping, but I think the furnace will be a real necessity.

Thanks for any help you can give me.
1997 Coleman Fleetwood Bayport
2012 Buick Enclave

Offline Unstable_Tripod

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Re: Furnace blower works, but no heat
« Reply #1 on: September 28, 2012, 02:07:33 PM »
Neither the furnace nor the fridge have pilot lights.  You are probably lighting a pilot light for the water heater.  Or, you may be lighting the propane flame for the fridge.  That isn't a pilot light because it does not ignite a bigger flame.  It is the entire heat source for the fridge when on the propane option.

The furnace has an electronic igniter.  First, be sure the propane is on and that the lines have been bled of air by running the stove for a few minutes.  Second, be sure the On/Off switch on the thermostat (different lever than the temerpature setting lever) is set to On.  Third, check under the metal furnace grille to see if there is a reset switch and if so, be sure it is set to On.  If all of these things are OK and it still won't light, check the sail switch.   
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Offline Team cmk

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Re: Furnace blower works, but no heat
« Reply #2 on: September 28, 2012, 02:10:23 PM »
UT - I'm curious, where is/what is a sail switch.
Thanks
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Offline Unstable_Tripod

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Re: Furnace blower works, but no heat
« Reply #3 on: September 28, 2012, 02:38:15 PM »
Inside the furnace housing.  The air from the fan moves it to make an electrical contact.  Without this contact the gas valve will not open.  It is a safety system.

HERE is an example of one on ebay.
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Offline mnebinger

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Furnace blower works, but no heat
« Reply #4 on: September 28, 2012, 02:39:27 PM »
A sail switch is used to turn the propane on inside the furnace.

Here's how it works:
1. Thermostat calls for heat.
2. Blower fan comes on.
3. Once the sail switch is "blown" by the air flow of the blower fan, the electronic igniter starts clicking and the gas valve opens. Then you here a whoosh as the burner lights.
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Offline rt749

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Re: Furnace blower works, but no heat
« Reply #5 on: September 28, 2012, 03:27:07 PM »
Thanks Unstable!  It must be the pilot for the refrig, because I don't have a water heater.

I seem to be on the right track and will try the other things you suggested.  Still not really sure where the sail switch is, but I think I have seen all of the other things you mentioned. I can't find a word in my owner's manual about the furnace.
1997 Coleman Fleetwood Bayport
2012 Buick Enclave

Offline freenaz

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Re: Furnace blower works, but no heat
« Reply #6 on: September 28, 2012, 04:03:09 PM »
The furnace probable has its own manual and won't be in the owners manual.
Make sure the thermostat is on and set high enough to start the furnace.
[PU] 1997 Santa Fe [TV] 2007 GMC Yukon [8D]
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Offline smit1088

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Re: Furnace blower works, but no heat
« Reply #7 on: October 01, 2012, 10:24:56 AM »
Make sure your polarity to the furnace (and the rest of the camper) is correct.  If the battery is hooked up backwards (Black is positive and white is negative on Coleman factory harness) the fan will run backwards and never let the sail switch turn the gas on.
I know this from a cold evening.
Good luck.
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Offline rt749

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Re: Furnace blower works, but no heat
« Reply #8 on: October 01, 2012, 12:33:01 PM »
Thank you for all of your suggestions!  I hope I am closing in on this. 

Furnace switch is ON.
Thermostat turned all the way up
Propane on and lines bled by running stove
Furnace blower comes on and blows strongly, but no heat
I hear a sound which I think may be the burner trying to light, but nothing happens.

Battery is disconnected in an attempt to make the low voltage alarm quit beeping, but no luck there.

Sail Switch?  There is also a 5 amp fuse in there?

1997 Coleman Fleetwood Bayport
2012 Buick Enclave

Offline bupkis

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Re: Furnace blower works, but no heat
« Reply #9 on: October 01, 2012, 12:54:18 PM »
Lots of possible causes.
see page 28, then 22-28
http://bryantrv.com/docs2/docs/hflameservice.pdf

I believe I'd check for voltage at the gas valve while it is attempting to light.

Don't believe it is recommended but have read that folks give their furnace a whack from time to time!!!
"All we want are the facts, ma'am"
'07 Chevy Colorado 3.7L I5

Offline rt749

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Re: Furnace blower works, but no heat
« Reply #10 on: October 01, 2012, 04:12:21 PM »
Thank you so much for the link to the manual.  I am not there yet but feeling more positive that I can get to a warm place!
1997 Coleman Fleetwood Bayport
2012 Buick Enclave

Offline freenaz

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Re: Furnace blower works, but no heat
« Reply #11 on: October 03, 2012, 09:47:45 AM »
"Battery is disconnected in an attempt to make the low voltage alarm quit beeping, but no luck there."

Are you referring to the LP detector as the low voltage alarm? If so then the furnace will not light because it is detecting LP. The LP detector could have a bad or dirty sensor.
[PU] 1997 Santa Fe [TV] 2007 GMC Yukon [8D]
2011 nights camped -  30
2012 nights camped -  25

Offline rt749

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Re: Furnace blower works, but no heat
« Reply #12 on: October 03, 2012, 07:59:20 PM »
Reasonably certain now (finally) that the lp detector was bad.  I have removed it and will replace.  I could not smell any LP, but that may be the only logical solution.  Removing it resolved the beeping!  I have not yet tried the furnace.

Thanks for your suggestions.  I will let you all know when (if?) I get it resolved.

:-)

1997 Coleman Fleetwood Bayport
2012 Buick Enclave

Offline ChocoChock01

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Re: Furnace blower works, but no heat
« Reply #13 on: January 22, 2013, 12:21:12 PM »
Inside the furnace housing.  The air from the fan moves it to make an electrical contact.  Without this contact the gas valve will not open.  It is a safety system.

HERE is an example of one on ebay.



Is there a test for either the Sail Switch or the Igniter to narrow down the defective item?

Offline bupkis

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Re: Furnace blower works, but no heat
« Reply #14 on: January 22, 2013, 12:46:34 PM »

Is there a test for either the Sail Switch or the Igniter to narrow down the defective item?


I'll suggest a volt meter to probe the gas vale at the appropriate time. If the gas vale is getting power then the relay, sail and limit switch 'passed'. The gas valve's solenoid coils resistance can be measured.

Various service manuals
http://bryantrv.com/docs.html#furnace
"All we want are the facts, ma'am"
'07 Chevy Colorado 3.7L I5

 


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