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Old 12-07-2008, 03:40 PM   #1
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Ruud Furn Clunk


My Ruud Furnace clunks just before the main blower turns on. Sometime the clunk a de clunk, clunk is prettey bad. Sounds like a solinoid not working properly. Any suggestions where to look?
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Old 12-07-2008, 04:01 PM   #2
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Ruud Furn Clunk


Sounds just like a bad U-joint on a car. In other words, a loose coupling or setscrew.
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Old 12-07-2008, 04:47 PM   #3
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Ruud Furn Clunk


No not like car U joint more like electrical solenoid not fully actuating. Is there a temp sensor that may be malfunctioning?
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Old 12-07-2008, 06:17 PM   #4
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Ruud Furn Clunk


Maybe a relay mount is loose.
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Old 12-07-2008, 06:35 PM   #5
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Ruud Furn Clunk


Maybe a humidifier solenoid.
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Old 12-08-2008, 08:37 AM   #6
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Ruud Furn Clunk


Or it could be the main gas control. There are two valves that have to open simultaneously.
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Old 12-08-2008, 07:16 PM   #7
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Ruud Furn Clunk


Thanks all for the diagnoses. I will check for the min. gas press. valve. That sounds more like what It could be.
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Old 12-08-2008, 09:15 PM   #8
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