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BOSCH DRYER M WTMC3521UC/05

no ignition

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8 replies to this topic

#1 tommytech

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Posted 12 February 2013 - 11:27 AM

just replaced a sensor on this dryer and tested it ,checked ok flame on ,no problems. finished reassembly and pushed back into final position and tested again-no go. ignitor glows,drum turns ,slight smell of gas but no ignition. vent is clear,lint filter is clean.tested belt switch. no help from tech sheet and no codes shown. any ideas? thanks

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#2 Samurai Appliance Repair Man

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Posted 13 February 2013 - 07:13 AM

just replaced a sensor on this dryer and tested it ,checked ok flame on ,no problems. finished reassembly 

 

 

What part of the reassembly were you at when the dryer tested good?



#3 tommytech

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Posted 13 February 2013 - 10:51 AM

drum was out,i had the pulley wedged with a block of wood to keep belt switch closed. im thinking the secondary coil on gas valve def,or the sensor on bulkhead under where the lint filter slides in.it also did ignite fully assembled,but did not ignite at all in its final position. the vent is about 15 ft long and is clean.

#4 Samurai Appliance Repair Man

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Posted 13 February 2013 - 11:17 AM

it also did ignite fully assembled,but did not ignite at all in its final position. the vent is about 15 ft long and is clean.


Does sound suspiciously like valve coils with what I call "thermal fatigue." That's where they'll work correctly the first time or few but then stop working when they heat up. It's a common phenomenon with dishwasher valve coils, too- FFTKAT.

The coils are inexpensive enough that its worth going ahead and replacing them.

#5 tommytech

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Posted 13 February 2013 - 12:32 PM

thank you sir

#6 Scottthewolf

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Posted 13 February 2013 - 10:57 PM

Just order this because Bosch doesn't sell just the coils separately:

 

http://www.repaircli...oid/279834/3479


Scott Wolf

#7 tommytech

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Posted 14 February 2013 - 07:06 AM

thanks scott,i will update when i install parts

#8 tommytech

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Posted 12 March 2013 - 07:49 AM

ok customer got back from vacay,went out to replace gas coils and dryer fired right up-the first time. after that no go.after much muttering offensive cuss words i found that the ignitor that i had installed previously had a couple hairline cracks in it. when it was cool,no problem,worked just fine. once warmed by heater it would not work  until it cooled off again.



#9 Samurai Appliance Repair Man

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Posted 12 March 2013 - 08:04 AM

Good find! That one took real kidneys. Domo for posting what you found. That gives us all a heads up on what to look for in these situations.




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