Question about Miele 36 in. KM3474 Gas Cooktop

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Miele KM 3474 stove top lights but turns off after 30 seconds

I have the 5 burner stove top KM 3474 with a right super burner which shuts off after 30 seconds. The other 4 burners ignite and remain on w/o any problem.

I have tried the following w/o any success

1). Swap burner unit from the left working super burner.
2) Cleaned the thermocouple with fine steel wool.
3). Reseated the knob.

I suspect the issue is that the thermocouple unit is not sending the correct voltage to the igniter unit so the gas is automatically cut off.

Miele tech support charges $170 (+parts) to send a technician out. There also appears to be no one local willing to touch Miele stove tops.

Miele tech support emailed me a repair manual for the KM 342 which appears to be an older version. The bottom plate of my KM 3474 has a "KM 342" label so mechanically, at least, the service manual appears to apply.

Has anyone had any success repairing a Miele stove top and getting repair parts ?

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  • mpchew Apr 04, 2011

    The issue turned out to be a bad thermocouple. The Miele customer support will send out parts but the onus is on you since there are no returns.

    I opted to a repair technician who used to be an official repairman and close to getting a Miele qualified (but non Miele employee) certification. Slight discount but still pricey. He ordered kit to replace all the thermocouples (additional $40 vs $80 for one) and took 1 hour to install them.

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Does the burner attempt to re-ignite after it goes out? If so, it's probably the therocouple. If not, it could be the burner valve. Be sure the caps and rings are correctly seated on the burners and be sure to firmly press the burner knob down to start the flame.

Posted on Feb 27, 2010

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  • advwilly Dec 25, 2010

    Yes, your advise to firmly press the burner knob down did keep the flame going and with igniter off but as soon as I release the burner knob, the flame stopped. Does this mean that thermocouple is not defective because it shuts off the igniter. Does this mean that the particular burner valve is defective or less sensitive to the thermocouple and needs adjustment. How do we fix this

  • Paul Collins
    Paul Collins Dec 26, 2010

    Here's how it works - There's a magnetic bushing

  • Paul Collins
    Paul Collins Dec 26, 2010

    Here's how it works. There's a magnetic bushing and coil insde the burner valve that holds the valve open once the signal from the thermocouple is recognized. Pressing down on the knob bypasses this bushing and allows the gas to flow for igniton. You may have a bad thermocouple or burner valve, but I would check to see if the body of the thermocouple is grounded to the hob - a spillover could cause a bad ground.

  • advwilly Jan 04, 2011

    The thermocouple is connected to the main board and also directly to the magnet (actuator) unit inside the gas valve. I opened the gas valve and checked the magnet (actuator) unit and noticed that the default position of the magnet actuator is closed. If I connect the the thermocouple directly to the magnet actuator bypassing the circuit board, the igniter will work but I won't get a flame since the magnet actuator shuts off the gas. It seems that the main board sends signal to the magnet actuator to open the gas during igniting and then the after 30 seconds, the thermocouple takes over to maintain signal to the magnet actuator. IS THIS TRUE???? My second question is how do we test the thermocouple and the magnet actuator? What if the magnet actuator does not allow slight fluctuation in thermocouple signals? Now, If the igniter shuts off after burner had a flame, the thermocouple should be OK right? Can I assume that it is the magnet actuator that is faulty? Appreciate your expertise and help...thanks

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How about the reverse, the burner lights, the ignitor clicks off but starts attempting reignite again even though flame is on. Any probable solutions to this problem??

Posted on Apr 04, 2011

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