York gas furnace P3USD12N08001B
Posted 11 December 2006 - 06:16 PM
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Posted 14 December 2006 - 07:25 PM
There could be several reason why this is happening. It would be helpful to know approx how long the cycle period is, on/off. Do you C the spark ignition control board (or box), and do you C the wire going to the spark ignitor? Usually it's a orange wire, heavy insulation. Looks like the spark plug wire of your car. Is it easy for you to C the burner manifold? (where the flame is)
Make sure the unit is off when you look around (unplug it). If you C the spark ignitor can you see another probe (flame sensor), most likely, (but not always) mounted on the opposite end of the burner manifold. It will also have a wire coming from it and going back to the control board.
If you have a flame sensor, first thing you want to do is inspect the wire. Make sure its not cracked, broken, etc, and attached securly at both ends.If that checks out what you want to do is get a telescoping inspection mirror-auto supply store. With the unit running-this isn't dangerous- use the mirror to C how much of this sensor is in the flame, with the unit running. C if the flame is being blown away from this sensor.
At least 1/4-1/2 inch of the probe should be exposed to the flame. Make sure it is not touching the metal of the burner manifold. Watch it untill the cycling starts. I've seen these probes heat up and bend due to the heat and short to metal of the manifold.
In some furnaces the spark ignitor also doubles as the flame sensor. If you only have one insulated wire, then thats your furnace. You need to do the same checks as above.
You may have a high temperature limit switch thats opening up if the cycle rate is like 5 minutes. Do you believe that you have a good amount of air coming out of your vents or is it just so-so? Some of the older furnaces used a fan belt to connect the fan motor to the blower. If its loose then your not moving enough air and the limit is tripping.
Make a couple of checks if you can get to the blower section and burner sections and let us know what you C. Just be careful!!!
Hope this helps:)
Posted 15 December 2006 - 05:19 AM
I'll keep these replies in my home maintenance file in case of future problems. Thanks again!
Posted 16 December 2006 - 06:32 AM
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