Question about Thermador 30", 36", 42", 48", 54" Wall Hoods, PH

2 Answers

My customer has a Thermador H26HQS range hood. When the fan motor became noisy, he obtained an identical replacement for the motor, which I installed. After installing it I noticed that the speed control didn't work. (I did not check at the time whether it worked with the old motor.) I thought that maybe the speed control was faulty, so I ordered a new one and installed it, but that didn't fix the problem. We then tested the old motor with the new speed control, and there was no speed control with that arrangement either! I checked the 10 MFD motor capacitor with my capacitor tester, and it tested O.K. Furthermore, with the capacitor out of the circuit neither the old nor the new motor will self start, so that tells me the capacitor is functioning at least to that extent. This is all very puzzling. Any idea what can be keeping the speed control switch from controlling the speed of the motor?

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  • Dave Brast Jul 08, 2010

    My customer has a Thermador H26HQS range hood. When the fan motor became noisy, he obtained an identical replacement for the motor, which I installed. The new motor is quieter, but after installing it I noticed that the speed control didn't work. I thought that maybe the speed control was faulty, so I ordered a new one and installed it, but that didn't fix the problem. We then tested the old motor with the new speed control, and there was no speed control with that arrangement either!

    I checked the 10 MFD motor capacitor with my capacitor tester, and it tested O.K. Furthermore, with the capacitor out of the circuit neither the old nor the new motor will self start, so that tells me the capacitor is functioning at least to that extent.

    The motor speed control switch is Thermador part number 19-11-915-01 (which crosses over to Bosch 414430) and it's operated by a knob. You turn the knob and it clicks on, and then you rotate clockwise for slower speed - when it's working. Right now the only thing that happens is that it turns the motor on at high speed. Further clockwise rotation does not change the speed.

    Keep in mind that neither the old nor the new speed control switch will control the speed of the new motor, and the old switch will not control the speed of either the old nor the new motor. The only combination we don't know about is the old switch with the old motor.

    This is all very puzzling. Any idea what can be keeping the speed control switch from controlling the speed of the motor?

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Wow, this is a situation, for sure. If the motor has a 3 wire system, the ground could be connected to the middle winding, and then both speeds would be the same. I would really check the wiring to the motor, as well as the switch. That's all I can think of, unless there is a crazy short, somehow.

Posted on Jul 08, 2010

  • Dave Brast Aug 17, 2010

    I found out what the problem was. When I replaced the blower motor, I couldn't be sure which blower wheel went on which end of the shaft, so I made a guess based on the shape of the vanes. I guessed wrong. If you switch the blower wheels, then there's not enough drag on the motor and that prevents the speed control from having any effect.

    What told me that this was the problem was looking at the blower wheel on the forced-air furnace at my house. I observed the configuration of the vanes on it and then turned it on to see which way it rotates. When I did that, it was obvious that I had the blower wheels on my customer's range hood reversed. Live and learn.

    Thought you'd like to know.

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The speed module is very simple: a triac with some extra components to modulate it, it's build exactly the same as the one from a vacuum. That speed module is controlled from the touch screen - are you sure the touch screen is operational? That's relatively easy to test - just put a potentiometer where the control signal goes and see if moving the potentiometer changes the speed.

Posted on Jul 07, 2010

  • Dave Brast Jul 08, 2010

    Good try, but this range hood (Thermador model H36HQS) has no touch screen. The motor speed control switch is Thermador part number 19-11-915-01 (which crosses over to Bosch 414430) and it's operated by a knob. You turn it and it clicks on, and then you rotate clockwise for slower speed - when it's working. Right now the only thing that happens is that it turns the motor on at high speed. Further clockwise rotation does not change the speed.

    Any idea what could be going on?



  • Azrael SRL Jul 08, 2010

    So which model is it:  H26HQS or  H36HQS , because i never heard of a Thermidor model called like that and i can't find it in their site.
    Never mind, it has a mechanical switch to control the module - have you checked the switch ? By rotating it you should be able to measure a change in the resistance (in kiloohms) that is controlling the module. Just put an AVO meter to its plots and check that - most likely the switch is internally shorted and should be replaced.


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