Natural gas powered furnace fan does not shut off

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Old 11-26-14, 02:03 PM
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Natural gas powered furnace fan does not shut off

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I have this Payne furnace and the fan does not shut off between heating cycles. If I turn the thermostat off the fan continues to run. I can shut it off at the breaker. If I turn on the fan at the breaker and then turn on the thermostat, the fan does shut off while the gas ignites and heats up. Once the furnace is at temperature the fan comes on but never shuts off. I called Payne but they were absolutely no help at all. They suggested calling an hvac tech. I have also looked all over and there are no identifying marks or model numbers beyond the Payne logo. Is there anyone familiar with this type of unit or this type of problem that can suggest a course of action that I can take to repair this?
 
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Old 11-26-14, 02:09 PM
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Welcome to the forum!! It makes it difficult without a model number. More than likely you have a stuck fan time delay relay. Some of those units use a fan control like the one in the attached photos. If you remove the panel where the control wiring is located and post some photos it will assist in trying to determine which part controls the fan.
 
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Last edited by firedawgsatx; 11-26-14 at 03:04 PM. Reason: Added photo
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Old 11-26-14, 03:45 PM
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Thanks for the prompt reply. Here is a picture of what you seemed to describe. The writing on this states "Delayed Response Valve" with a model # 1/2 A641.
It says it is "NEC class 2 circuits, 24 volts, .4 amp. Does this seem like the thing to replace in your opinion?
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Old 11-26-14, 03:53 PM
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That is the gas valve in the photo. With power shut off, locate the blower and follow the wires from it to see where they connect.
 
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Old 11-26-14, 04:09 PM
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I found this nestled in the heat exchanger. Does this seem to be the culprit?
 
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Old 11-26-14, 04:20 PM
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That looks like it is the limit switch. The blower relay should have the thermostat wires attached to it.
 
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