Bosch wtmc3521 dryer will not heat. Runs, but no

This may help. Notice that the high limit thermostat has a red button.

Bosch Dryer Doesn Heat

Check your igniter, if that does not get hot enough it will not open the gas valve. If it does not glow at all check for voltage if voltage is present 120vdc replace igniter.

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http://www.partselect.com/dryer+dryer-wont-tumble+repair.htm

Hi,

If you are having problems with your gas dryer not heating the most common problem is that the ignitor goes bad. Even though it glows sometimes it is still not working properly.

if you dryer is gas check out this gas no heat tip....

If you have an electric dryer, you can have many different things that can go wrong causing the dryer not to heat.

check out this electric no heat tip...

heatman101

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the thermostats at the element have to be replaced, they burn out prematurely if the condensor unit is not cleaned on a regular basis.

Probably the heater element has failed, it would probably be better to think of replacing the dryer at 10 years old, as Bosch spares are very expensive.
Hope this helps you to make a decision as to what to do.

Most likely it is the thermal switch that is located near the heating elements. This switch is the device that regulates the temperature. When it goes bad, it remains open usually. Short of a burned heating element wire, this is probably it. The only other thing it could be is the switch on the end of the motor. This switch turns on the heating element only if the motor runs. Check that too. Good luck.

Sounds like a blown thermostat, usually caused by venting problem. If you live in a condo maybe there is a lint screen in the wall that you're not checking

yes it needs a new control and its pretty easy to replace

I just had the same problem, motor runs but no heat. I had a fun time figuring out how take the front panel off, hint the rubber seal comes off easily. It looks like mine tripped the resettable over heat sensor. So far so good.