Original message
| acetrebo
 |  "improper blower operation"
, posted Fri 25 Jan 16:03  
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I have a ruud 80 plus furnace that has a problem. here is the deal...
Exhaust fan turns on. The pilot kicks on, and burners ignite. Burns for a minute or so.
But, the blower does not kick on.
When high temp is reached, burners turn off, and blower kicks on and cools system down.
Then cycle repeats. Burners come back on, overheats, and shut off. Blower kicks on and cools it down, and cycle repeats.
What do I need to replace to fix this?
Thanks in advance for any advice.
acetrebo
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Replies:
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| bwjordan
| "Re(1):improper blower operation" , posted Sat 26 Jan 10:30
It depends on the age of your furnace and the components used. It sounds like a control board or fan cycle switch. Older furnaces used a fan cycle switch. With newer furnaces the control board has a diagnostic light. The diagnostic will not tell you which part you need to replace but it can hint to what is happening. While your furnace is cycling like this does the fan and gas valve ever run together? If it is exactly the way I think you describe it: ignition - fan - ignition - fan then you have a control problem.
Brandon Jordan
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