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Bosch Dryer Tripped TCO

Koi Guy

Entry posted by Koi Guy in Field Repairs

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Went to a call for a Bosch electric dryer not heating. I did the standard checks, including checking the air flow at the outlet on the house. It was ‘pretty good’ using my calibrated hand. I disassembled heater assembly, expecting a tripped TCO (thermal cut out), and surely enough it was tripped. So we had an overheating at some point.

Next I checked the heater thermistor, it was near spec and while it had some lint on it, it wasn’t excessive, so I didn’t think that was an issue. Hmmm. Let’s look at the heater. Ah ha!

Found it! A massive build up of fine cotton lint within the coils of the heater ribbon. Took apart heater canister to expose the heater ribbon, got the air blower out and blew out most of it. I used a fine flat head screwdriver and manually picked out the remaining.

If I hadn’t pulled off the heat assembly to inspect it, I wouldn’t have seen the blockage.

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5 Comments

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Sam R

Sam R

Posted

Hey thank you for sharing this! Good encouragement to be thorough.

Ronny01

Ronny01

Posted

Thank you for sharing 

Oles Safonov

Oles Safonov

Posted

Thank you! quick question. will lint on the heating element itself create overheating hence TCO tripping, or is it an airflow restriction that causes overheat?

longbeachbull562

longbeachbull562

Posted

Man good find. And thanks for the info!

goliad

goliad

Posted

Thanks for sharing the interesting repair problem.  I am curious if the TCO, (I am assuming it is the 2nd photo) is in a tripped position?   Also, what is the rectangular black object in photo 3?  Did you have to remove the outside panels to get to the heater?  Were you able to keep it sitting on the what appears to be the washer?  Or did you take it to the floor?  It appears to have two separate heater elements? Do they have different functions? The last photo looks like a fire just waiting to happen.  Any ideas why  the lint is so great inside the heater? The customer not cleaning the lint filter? 

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