Question about Thermador 600 CFM Internal Ventilator Model - VTN620B Kitchen Hood

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Thermador range hood ventilaor motor failed

Thermador vtn620B motor stopped working after a month. started making knocking noise...now just grinds (fan moves when motor is off, nothing obstructing) This is our second motor, the first one did the EXACT same thing Help!

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  • anois Jan 26, 2009

    there is poer coming into the hood. When the vent is turned on it makes a loud BUZZ. A month ago it would knock and turn, knock and turn with some suction. Now it just buzzes and doesn't turn as the first motor did the exact same thing. Thanks for the help.

  • anois Jan 26, 2009

    there is power coming into the motor

  • anois Jan 27, 2009

    it is difficult to get to the motor shaft because the whole cage is one unit and can't be opened. any suggestions and would the motor move freely when turned off if this were the solution?

  • anois Jan 27, 2009

    I will find someone to test the voltage. It has a motor start capacitor, could the problem be there...its made in Italy (Ducati) and impossible to find in this country. The whole unit is german made embpapst (I think)

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Its better you replaced the running capacitor maybe its faulty already.

Regards:
VOTIT

Posted on Jul 07, 2009

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Hello and welcome to FixYa!,

It sounds like there may be a Power ource, Too High or too Low for the Motor to Handle, Which is Making it burn Out.

Try a different Power Source at a Higher Or Lower Voltage- After replacing the Motor!

Hope this helps --P3NGYJ03

Posted on Jan 27, 2009

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Unclogging the exhaust system Step1Remove the grease filter by sliding it out of its clips.Step.Submerge the filter in a plastic pan filled with hot, soapy water and 1/2 cup (4 fl oz/125 ml) ammonia. Let it soak for at least 15 minutes. If it's still dirty, soak it again, then rinse it thoroughly and set it aside to dry.
Step3Remove the exhaust fan. Unplug the fan, then use a screwdriver or a nut driver and socket to take out the screws that attach it to the hood.Step4Clean the fan blades with an old toothbrush dipped into the ammonia-water mixture (see Warning).Step5Clean the inside of the exhaust ductwork, using a plumber's snake with a heavy rag tied around the end. Push the snake through the ductwork. Soak the rag in the ammonia and water mixture, then run it through the ductwork. Rinse out the rag and repeat the operation until the duct appears to be clean.Step6Clean the exhaust hood that's attached to the outside of your house. Use the old toothbrush and the ammonia-water mixture to loosen the grit and grime around the flapper plate. Make sure the plate moves freely when you're done. If it sticks closed, it can prevent the exhaust hood from working.
Step7Reinstall the grease filter.
Replacing the fan motor Step1
Remove the grease filter by sliding it out of its clips.
Step2
Turn on the fan and inspect the motor. It needs to be replaced if it hums rather than turns, turns very slowly, runs for a short time then stalls, or feels very hot and won't turn.
Step3
Disconnect and remove the fan, following step 3, above.
Step4
Take the fan to an appliance store to get an exact replacement.
Step5
Install the new fan.

Posted on Jan 26, 2009

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Grinding sounds like the rotor in the motor has grounded. And if you've lost the 2nd motor in a month, how long did the first motor last?

Confirm that the unit has 120 VAC, and not 208-240 VAC or something over 120 but no more than 208-240.

If I remember correctly (friend has one), these are 1/3 HP motors, and they are pretty robust. Bumping and rubbing for a month of normal intermittent operation should not have caused premature failure.

Was the motor replaced by a tech, and if so, did he hear the noise after replacing the new motor?
Was motor current measured?
Is there a run capacitor in the electrical panel, and if so, was it replaced when the replacement motor was installed? (You always replace the run cap when replacing the motor!).
Can you twirl the motor by hand, then turn on before it stops turning, and the motor continue to pick up speed and run properly? (If so, replace run capacitor).

Posted on Jan 26, 2009

  • Mark Egan Jan 27, 2009

    Yes, motor start capacitor could be bad. And as I stated earlier, if it wasn't replaced when the last motor was replaced, shame on the person who replaced the motor. The cap could be causing th emotors to fail, and they are not easily tested to determine if they are the cause. But, they are so cheap, you always replace with the motor.

    A cap for this motor will be available in the US. Just match or exceed the voltage rating, but be sure and get as close as possible to capacitance, going lower, rather than higher, if you can not find the exact right one.

    Motors may be available for this unit in the US, but since it is manufactured in Italy, then it's very likely to be a metric built motor. Those are much harder to find in the US, and are expensive at that.


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I'd start with the motor brushes.

Posted on Jan 26, 2009

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There are many companies that make replacement motors, call a contractor's electrical supply, (check the phone book) they sell to the public, they can supply u with a higher quality motor, just bring the old one with u and they can match it up.

Posted on Jan 26, 2009

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  • Thermador Master
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If the motor started making noise, it could have lost grip on the bearing, in this case the motor will be still working.

You need to test the new motor by energizing it. If the motor works reassemple it properly, or test the wirings.

If the motor is stiff then you need to use grease on bearings.

If the motor had blown, then there is need to test the voltage from motor control board, that can be reason why you have blown the two motors.


Posted on Jan 26, 2009

  • Ginko
    Ginko Jan 28, 2009

    If the motor started, then the problem should have nothing to do with the starter capacitor.

    You can replace it the same, just in case, but I don't think this will make any difference.


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Usually Putting High Temp Grease On The Fan Motor Shaft Will Do The Trick And Make Them Last A lot Longer.

Posted on Jan 26, 2009

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Check for power in the wiring coming into the hood.

Also check for a loose wire or a defective fuse.

Posted on Jan 26, 2009

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