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My Bosch WTL 5500 dryer had blown a fuse, and now it does not heat up.

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  • pekka_roine Mar 20, 2011

    Thank you. Either the heater element was partially 'burned out' or at least clogged. Now waiting for the new heater element.

  • pekka_roine Mar 22, 2011

    I have now replaced the heater element with a brand new spare. Initially, it briefly was glowing, but now it stays cold. Is it therefore the thermostat? It that the piece sliding on the drum surface? Any way to short or test the thermostat?

  • pekka_roine Mar 22, 2011

    Seems the high limit thermostat had opened when I tested the heating element after installation. I reset the high limit, and, now the dryer appears to work OK, at least initially. Thank you.

  • pekka_roine Mar 23, 2011

    After installing the new heating unit (and resetting the open high limit thermostat attached to it), the dryer initially worked. However, the first 'real' drying load appears to have again released the high limit thermostat, as no hot air is produced. I guess I now need to proceed to check if anything obstructs the airflow, leading to overheating. The condenser has been regularly rinsed, thou.

    Could the temperature regulator, located under the door, be faulty, leading to overheating?

  • pekka_roine Apr 16, 2011

    I now have a new temperature regulator for the dryer. How do remove the old regulator and its seal from the door frame?

  • pekka_roine Apr 16, 2011

    I now have a new temperature regulator for the dryer. How do remove the old regulator and its seal from the door frame?

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  • 72 Answers

If the dryer blew a fuse, it sounds like the heating element has gone, and drew enough current to take out the fuse.

If this is not the case, the thermostat may have burned out, which it can do if the condensor is not regularly cleaned.

Good luck!

Posted on Mar 17, 2011

  • Marc Uhrey
    Marc Uhrey Mar 22, 2011

    The thermostat should be located on or near the drum, and should have two wires connecting to it. In order to test the thermostat, you will need an ohmmeter, which measures resistance. You must temporarily remove the two wires connected to the thermostat and connect the two ohmmeter leads to the thermostat connecters. If the thermostat is good, you should be able to see the resistance change if you apply heat to the thermostat, such as with a hair dryer. You may have to change ranges on the ohmeter to see a reading other than "1." which indicates that the measured resistance is higher than the selected range. Most digital multimeters have resistance ranges of 200 ohms, 2000, 20K, 200K, and 2000K. If you do not see readings other than "1." on any of the ranges, this indicates the thermostat has an open circuit (no internal connection) and should be replaced.
    Good luck!

  • Marc Uhrey
    Marc Uhrey Mar 23, 2011

    Checking for obstructions would be wise, and shoud be done regularly.
    You said that no heat is produced, however, so it doesn't appear that overheating is an issue. The temperature regulator may prevent the dryer from heating, however. It's difficult to diagnose problems without being able to see the appliance and its symptoms.
    At this point, you may want to consider getting in touch with Bosch Customer Service to find out their recommendations, if you haven't already.

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