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Old 05-08-2010, 07:11 PM   #1
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furnace blows cold air only

Not sure why but all we're getting is cold air, have plenty of propane and all other thinga gas work fine.......Any ideas?
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Old 05-08-2010, 07:29 PM   #2
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Is it a Suburban furnace?
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Old 05-08-2010, 07:39 PM   #3
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If you have recently had the gas line off the tanks you may have a slug of air in the line to the heater. All the other appliances will purge themselves but the pilot line on the furnace is very small. What I do under this condition is crack the gas line at the heater till you smell gas. Tighten the line and retry to light the heater.

if this fails you may have a bad sail switch or control board but my money is on the gas.
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Old 05-08-2010, 07:59 PM   #4
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I don't think it's air in the line... The furnace was working great this morning....
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Old 05-08-2010, 08:04 PM   #5
Full Timers/Diesel power.
 
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Quote:
Originally Posted by 99Limited34 View Post
I don't think it's air in the line... The furnace was working great this morning....
Is it a Suburban? Wait a minute, I already asked that question.
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Old 05-08-2010, 08:12 PM   #6
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I have no idea if it's a Suburban or whatever.......It's whatever they put in a 99 34' limited....How can you tell?
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Old 05-08-2010, 08:29 PM   #7
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Did not mean to get your dander up, just a innocent question. Take a look at the furnace, you should see some kind of i.d. there that would help us help you.
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Old 05-08-2010, 08:39 PM   #8
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My dander isn't up at all......It's a hydro flame, made by Atwood.....
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Old 05-08-2010, 09:13 PM   #9
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After the furnace has set for a while.

(1) Raise thermostat arm until the anticipator clicks
(2) Blower should come on for 30sec-1min to purge gas
(3) Listen for ignitor to spark
(4) Allow 1 minute for heat to warm the air

If no heat after a minute or so

(5) Take the wood cover off the front of furnace cabinet
(6) Put an electric heater blowing on the front of the heater for a half hour or so. Especially if it has been cool & damp.
(7) Go back and try the start procedure.

If if ignites after warming the unit, I would suspect the electronic board needs to be changed.
If it does not ignite, I would suspect the gas control valve.

Either part is $100 or more & $75-100 to have a service man change out.


I have been throught this process with a suburban 30 that is a littlle older than yours but, I should have just installed a new furnace at the beginning.
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Old 05-08-2010, 09:17 PM   #10
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do you have gas at the stove burners?
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Old 05-08-2010, 09:48 PM   #11
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I do have gas at the stove burners and the water heater works as well on gas
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Old 05-08-2010, 09:49 PM   #12
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Quote:
Originally Posted by wingfoot321 View Post
After the furnace has set for a while.

(1) Raise thermostat arm until the anticipator clicks
(2) Blower should come on for 30sec-1min to purge gas
(3) Listen for ignitor to spark
(4) Allow 1 minute for heat to warm the air

If no heat after a minute or so

(5) Take the wood cover off the front of furnace cabinet
(6) Put an electric heater blowing on the front of the heater for a half hour or so. Especially if it has been cool & damp.
(7) Go back and try the start procedure.

If if ignites after warming the unit, I would suspect the electronic board needs to be changed.
If it does not ignite, I would suspect the gas control valve.

Either part is $100 or more & $75-100 to have a service man change out.


I have been throught this process with a suburban 30 that is a littlle older than yours but, I should have just installed a new furnace at the beginning.
Thanks for the reply, I'll give this a try tomorrow.....
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