intermittent blower fan


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Old 06-26-13, 06:13 AM
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intermittent blower fan

I have a York furnace. Recently the fan (when either the heat, air conditioning or just the fan is on) will run for a period, a thumping sound occurs and the fan shuts off temporarily, approximately 5 sec. This could occur once within a run or 2-3 times within a run. The fan then continues to work fine until the cycle ends. The amber light on the front of the furnace continues to flash normally indicating the furnace operation is fine.
 
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Old 06-27-13, 01:35 AM
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Welcome to the forums.

The orange light on the front is basically indicating the burner operation is normal. It doesn't really monitor the motor for actual fan motor issues.

I can not think of why the motor would start thumping unless it's a belt driven model and it's time for a belt. Have you taken off the blower door and made a visual inspection ?
 
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Old 06-27-13, 04:28 PM
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Is it a Variable Speed blower?.............................
 
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Old 06-28-13, 08:33 PM
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yes blower is a variable speed
 
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Old 06-28-13, 08:38 PM
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yes we checked out the area where the fan resides, vacuumed the fan, not sure if it is belt driven. I will need to check this out. I should have said the furnace makes a groaning(not thumping) noise prior to the blower shutting off.
 
 

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