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MGDB400VQ0 keeps blowing thermal cut off


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3 replies to this topic

#1 gschomburg

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Posted Today, 09:17 AM

I recently got called to repair a Maytag Bravos Gas dryer MGDB400VQ0.  This is the horizontal blower design.  I was the second company to be called to repair this dryer for a no heat condition.  I asked to see the work order left by the other company.  The work order tech comments read replaced thermal cut off and repaired tumbler felt seal.  I disassembled the dryer and tested the thermal cut off on the burner cone.  It was defective so I looked up the part number but it was different than the one that was installed by the previous tech.  He installed a thermal cut off rated for 309 degrees F when it should have been 352 degrees F.  Installed the correct part, cleaned lint trap area, reassembled, and tested.  A few days later I was back for no heat again.  This time I replaced the thermal cut off again but I also replaced the high limit thermostat which I should have done the first time but this dryer does not have a kit with both the thermal cut off and the high limit yet.  My gut feeling was there must be something else causing a decrease in air flow.  I checked the blower after seeing a service bulletin about it coming loose.  It was tight.  Since this is a belt driven blower I thought if the belt was bad/stretched it may be slipping causing a loss of air flow.  The new belt was noticeably tighter but orientation is also important.  The blower belt goes from the top of the motor pulley to the back of the blower pulley.  There are instructions that come with the belt.



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#2 Applianceman97

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Posted Today, 09:54 AM

What is your exhaust temperature?

 

SO did you you disassemble the whole lint trap and blower housing to clean out the lint? Those are notorious for plugging up with lint.

 

Also how is the exhaust vent? possible needs the duct system cleaned.

 

Have you tested or changed the cycling thermistor or thermistor? (not sure which one you have)


Kicks major Samsung booty first, asks diagnostic questions later.

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#3 gschomburg

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Posted Today, 11:20 AM

The temperature in the lint trap on high heat cycled off at 180 degrees F and on at 120 degrees F with no load.  Cycled several times on the control relay in the console.  I did disassemble the whole lint trap and cleaned the lint out all the way to the blower.  She had the local Dryer vent wizard guy out and he did clean the venting.  There was not much lint build up in the vent according to him.  He told her the dryer's exhaust was at 17 miles per hour.  Which does not make sense to me I started thinking how do I convert MPH to static vent pressure or CFM.  I did not change the thermistor because I felt it would open the thermal fuse instead of the thermal cut out and it was in range.  Strange thing on the tech sheet is the thermistor specs only go to 100 degrees F.  



#4 sh2sh2

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Posted Today, 11:33 AM

Some or these had a service flash on needing to replace the burner cone and possibly the one part of the burner for repete problems




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