Author Topic: Bosch Dryer won't run more than couple of seconds.  (Read 1247 times)

Offline tgoods

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Bosch Dryer won't run more than couple of seconds.
« on: October 17, 2011, 02:17:02 PM »
I don't get a chance to work on many Bosch dryers.  WTMC3321US/03.  No matter where you set it, it shows 20 minutes on the display.  Press start and it will only run for a couple of seconds. I tested both thermistors and they seemed to be within spec. It is intermittent and was running properly when I left.  What do you think, the control board or one of the thermistors? Schematic.

Offline tgoods

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Re: Bosch Dryer won't run more than couple of seconds.
« Reply #1 on: October 24, 2011, 10:57:24 PM »
Went back with both thermistors and the control board today.  It was actually working worse than the first time I looked at it so it was much easier to diagnose.  I could jiggle the cycle selector knob and get the display to flicker between the correct time and 20 minutes.  I pulled out the control board and resoldered all the selector switch connections.  Put it back together and now it works great.  Saved my customer the cost of a $300 control board so, needless to say, they were very happy.

Offline AJ

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Re: Bosch Dryer won't run more than couple of seconds.
« Reply #2 on: October 24, 2011, 10:59:10 PM »
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Offline krazytech

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Re: Bosch Dryer won't run more than couple of seconds.
« Reply #3 on: October 24, 2011, 11:10:29 PM »
Cool. where the connectors loose or burnt? did you add solder or just heat them up and let the old solder flow?
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Offline JWWebster

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Re: Bosch Dryer won't run more than couple of seconds.
« Reply #4 on: October 24, 2011, 11:42:59 PM »
Can you post some photos? Never even seen a Bosch appliance.
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Offline tgoods

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Re: Bosch Dryer won't run more than couple of seconds.
« Reply #5 on: October 25, 2011, 12:30:21 AM »
There were 9 connections and all but one were redundant. So I'm sure the one lone one was the cracked joint. I lost my magnifying glass so I couldn't tell by looking at it.  I used a soldering iron and added a little extra solder.  I've heard of using a heat gun to reflow the solder, haven't tried that myself.  No pics, sorry.

Offline krazytech

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Re: Bosch Dryer won't run more than couple of seconds.
« Reply #6 on: October 25, 2011, 07:53:10 PM »
I had a Frigidaire dryer that was doing the same thing.. Removed to control and the main relay was melted. Replaced the control and it's all good.
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