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This dryer blew a thermal fuse shortly after it was moved to a new house. relocated the exhaust vent 3

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Old 04-22-2011, 10:54 AM
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Cool dryer blowing thermal fuses
Brand: Whirlpool   Age: 1 - 5 years   

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This dryer blew a thermal fuse shortly after it was moved to a new house. relocated the exhaust vent 3 different times and blew thermal fuse shortly after each time. we have checked for shorted heater element. checked thermistor and resistance was within specs. I think the dryer has a heat control problem and I am inclined to replace the control module and thermistor, but I was hoping for another opinion before i coughed up 200 bucks for the parts. Any ideas. thanks for any help!!


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Old 04-22-2011, 11:53 AM
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Originally Posted by dlynns47 View Post
This dryer blew a thermal fuse shortly after it was moved to a new house. relocated the exhaust vent 3 different times and blew thermal fuse shortly after each time. we have checked for shorted heater element. checked thermistor and resistance was within specs. I think the dryer has a heat control problem and I am inclined to replace the control module and thermistor, but I was hoping for another opinion before i coughed up 200 bucks for the parts. Any ideas. thanks for any help!!




Dlynns,

Have you checked the lint filter and housing and blower interior, for a lint build up or clog ?

You stated you've relocated the exhaust vent 3 times, is it as short and straight as possible, and clean all the way out to and including the vent hood ?

I don't think you'll need either of the parts you mentioned, the thermal fuse operates on temperature. you may have a shorted element oe wire, causing an overheating situation, but the thermal fuse is doing it's job.

We could have been more helpful, if you had supplied a model number for your dryer, but this should be helpful.

Thanks,

Good Luck
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Old 04-23-2011, 10:35 AM
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The entire vent assembly from the blower housing to the outside wall has been disassembled and scrubbed clean and we have tried to relocate the flex hose twice and then replaced it with a rectangular close clearance assembly that was sold by Lowe's to address close clearance airflow restrictions.

I understand that the thermanl fuse is designed to blow when the temp goes over 195f but if the the temp control portion of the electric control module and the thermistor is doing thier job, the temp should never go that high in the fisrt place. In high temp mode, the temp is supposed to be regulated to 155f.

In my limited experiance, I have seen dryers with the vent hose clogged completely up that didn't blow the thermal fuse, they just never got the clothes dry because the heat cycled off so often.

This is a Whirlpool Duet Model # GEW9250PL1
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Old 04-25-2011, 09:22 AM
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Originally Posted by dlynns47 View Post
The entire vent assembly from the blower housing to the outside wall has been disassembled and scrubbed clean and we have tried to relocate the flex hose twice and then replaced it with a rectangular close clearance assembly that was sold by Lowe's to address close clearance airflow restrictions.
I understand that the thermanl fuse is designed to blow when the temp goes over 195f but if the the temp control portion of the electric control module and the thermistor is doing thier job, the temp should never go that high in the fisrt place. In high temp mode, the temp is supposed to be regulated to 155f.

In my limited experiance, I have seen dryers with the vent hose clogged completely up that didn't blow the thermal fuse, they just never got the clothes dry because the heat cycled off so often.

This is a Whirlpool Duet Model # GEW9250PL1
Dlynns,

OK then,

Check for thermistor resistance,at the control board, check across the wires at the P2/5(red/wht stripe) to P2/6(blk), it should be read at 10,000 ohms resistance at room temperature, it is a negative coefficient fuse so the resistance will decrease as the temperatuure increases, your element should be approximately 8 to 12 ohms resistance across the element terminals and an open circuit(infinite resistance) from each terminal to the case or chassis ground.

If those all check within range, replace the control board,

Part number: AP3775548

Part number: AP3775548


Since you have some experience at this, you will be doing these checks with the dryer vent disconnected from the dryer.

Good Luck,
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