Question about Thermador C302U Electric Double Oven

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We have a Thermador C302UB Double Oven. We cannot select the Lower Oven. Normally when pressing any button on the control panel there is a "beep" to acknowledge that a button was pressed. There is no "beep" when you press the Upper/Lower control panel button and the upper oven stays selected. It appears that the Upper/Lower control panel button is not working. All of the other control panel functions seem to be working we just can't select the lower oven.

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  • robertsta345 Sep 12, 2010

    Hi,

    I removed the front control panel and disconnected all of the connectors. I did not see any obvious solder problems or an easy way to check for conductivity with a meter. I'm assuming that the problem is probably with the TouchScreen Technologies board P/N 16-10-089-02. This is the board that has the touch button that selects between the upper and lower ovens. I was very careful when I disconnected the cable assemblies and the connectors are all polarized so you cannot mix up the connectors. Anyway, after I reassembled the control panel and I turn back on the circuit breaker the clock appears and then I get an error code F:11 followed by 3 beeps. It then switches back to the clock display and then back to the F:11 display followed by the 3 beeps. It continues to cycle between the clock display and the F:11 display. Interestingly, the function key that selects between the two ovens does appear to at least be recognized now. I disassembled it again to see if there was any obvious connection problems but everything looks fine and with the polarized connectors it's pretty much impossible to mess things up. Do you know what error code F:11 means and/or have any idea to what I might have messed up? Before I removed the panel we at least had the use of the upper oven. Now we don't have either. Thanks.

  • robertsta345 Sep 12, 2010

    Hi,

    I removed the front control panel and disconnected all of the connectors. I did not see any obvious solder problems or an easy way to check for conductivity with a meter. I'm assuming that the problem is probably with the TouchScreen Technologies board P/N 16-10-089-02. This is the board that has the touch button that selects between the upper and lower ovens. I was very careful when I disconnected the cable assemblies and the connectors are all polarized so you cannot mix up the connectors. Anyway, after I reassembled the control panel and I turn back on the circuit breaker the clock appears and then I get an error code F:11 followed by 3 beeps. It then switches back to the clock display and then back to the F:11 display followed by the 3 beeps. It continues to cycle between the clock display and the F:11 display. Interestingly, the function key that selects between the two ovens does appear to at least be recognized now. I disassembled it again to see if there was any obvious connection problems but everything looks fine and with the polarized connectors it's pretty much impossible to mess things up. Do you know what error code F:11 means and/or have any idea to what I might have messed up? Before I removed the panel we at least had the use of the upper oven. Now we don't have either. Thanks.

  • robertsta345 Sep 14, 2010

    Okay, After I got the F:11 Error Code I re-removed the control panel. There was nothing obvious (Even though I was very careful I thought that maybe a pin on one of the connectors got bent) so I reinstalled it. The connectors are all polarized so it's impossible to get them mixed up. After I reinstalled it I was back to square 1 but at least I no longer had the F:11 Error Code and the top oven could be used. The wife was really upset when we went from one oven to zero.

    I did visually inspect all of the solder connections with a magnifying lens and they appear to be fine. It's very difficult to actually get a meter on them since the PCB has a coating on it. Is it possible that the cable that goes from the Left Touch Control Panel P1 connector to the Display Head P1 connector has a loose wire. The connector uses insulation displacement to make the connections.

    I didn't notice any signs of water in the control panel. I'm pretty sure that the problem is either in the Left Touch Control Board or the connection between it and the display head. The new control panel assembly is about $300.
    http://www.repairclinic.com/SSPartDetail...

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  • Master
  • 944 Answers

Hi,
The problem lies in the control and harness assembly. Bad solder on the control pin connector will cause this type of issue. you will need to solder the pin in the control panel.Some times short circuit in wire might cause this issue.So see for any damage in the wire and loose connections in the door.This is 100% soldering problem.Use multi-meter to check you are getting proper readings.Check for water marks on the control board.Some times water on the circuit board will cause short circuit and may also cause this issue.


post a comment for further assistance.
Thank you for using fixya have a nice day:-)

Posted on Sep 11, 2010

  • 2 more comments 
  • Natarajan Ramasamy
    Natarajan Ramasamy Sep 12, 2010

    F11:Serial communication error:
    Communication between the Central Control Unit (CCU) and the Motor
    Control
    Unit (MCU) cannot be sent correctly.

    Please check the connections correctly.Since there some loose contact in the wire this problem is coming.F11 error code.Just use the multimeter to check the connections.See the change in reading using it.Do continue testing so that you can easily find out the exact reason.





    Communication between the Central Control Unit (CCU) and the Motor
    Control
    Unit (MCU) cannot be sent correctly.



    Check Wire Harness connections to the MCU, the motor, and
    Central
    Control Unit (CCU)
    Check the Drive system for any worn or failed components

    Check MCU
    Check CCU

    Check Motor
    Check Wire Harness



    Replace failed component.




    If you don't have hands on please don't mess up.Thank you.

  • Natarajan Ramasamy
    Natarajan Ramasamy Sep 12, 2010

    TouchScreen Technologies board:See the copper lining on the board to have any water type of rust marks.If so it needs to be replaced.

  • Natarajan Ramasamy
    Natarajan Ramasamy Sep 14, 2010

    I have a doubt on the connection between it and the display head.How much year old is your Oven.After 3-5 years only we usually get the control board problems that will be fully defective.

  • robertsta345 Sep 14, 2010

    The oven is almost 8 years old.

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