Question about Bosch 3.81 cu ft WFMC530 1UC Nexxt 500 Plus Series Washer

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I believe the sensor for water level is bad. Tub fill or empty.

I believe the sensor for water level is bad. It won't fill water into tub nor when it gets to the drain cycle, will it stop. The pump just goes and goes and never stops. Took the cover off, the pump is clear and is turning with no restrictions. The impellers look good with no visible damage. The intact screens are clean and there is plenty of pressure. It has an E-13 (not E-03) during rinse cycle and will not proceed. Bosch 500 series

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  • cblakney853 May 16, 2010

    Thanks Jahn, for the sound conclusion on what the problem is. It took a lot of investigation on my part and patience to read through the reams of information I provided.

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You are absolutely correct if the pump continues to work even when the tub is already empty. The water level sensor is stuck in the full position making the pump work continuously until the E-13 (long drain) code flashes. During the fill cycle, the washer won't fill because the control "thinks" it is still full due to the sensor being stuck in the full position.

Posted on May 16, 2010

  • 4 more comments 
  • cblakney853 May 16, 2010

    Jahn, you said: The water level sensor is stuck in the full position making the pump work continuously until the E-13 (long drain) code flashes.
    Clem replies: Since I can't find any kind of diagram/parts list with descriptions and drawings I am guessing that the level sensor is actually in a rubber bulb at the bottom of the tank. One pipe goes to the drain pump and the upper pipe is what houses the water level sensor. The pinch'clamp has to be removed and then has to be pulled and cleaned or replaced; is that correct?

  • cblakney853 May 16, 2010

    Jahn,
    I removed and examined the air chamber where the water level sensor tub leads to. It is totally clean and unobstructed. Then it narrows it down the the sensor unit itself as possibly being bad. The tub is secure on both ends so there appears to be no air leak. It there a way to troubleshoot sensor or just replace it?

  • cblakney853 May 16, 2010

    OK Jahn, I have the washing machine put all back together. Started it on a Hot temperature cycle. The tumbler started tumbling but no water enter the tub. So two solenoids bad... don't think so. At 34 minutes into the cycle the drain pump kicked in... nothing to pump of course. Then the spin led popped on no the pump continued and the tumbler did not start spinning either. The sensor most likely says there is too much water to spin and keep pumping. So the water level tube goes up to a round object(White top w/red bottom) with multiple wires going to the control panel and also the water heater elements. So what do you that is bad the the water level control module or the main control module? As I have asked several times for... is there a wiring/service manual that I can download. Clem

  • cblakney853 May 16, 2010

    Am I doing something wrong that I am NOT getting any feedback or solutions?

  • Jahn27
    Jahn27 May 16, 2010

    My apologies for the delayed response due to time zone constraints. The white-top red-bottom round object with multiple wires where the water level tube leads to is the pressure sensor that houses the pressure switch. I see no other problem except the pressure sensor as the washer works fine except for the fact that water does not enter the machine and the pump continues to work. Water not entering the machine does not necessarily signifies a bad water valve solenoid as the control will pop up an error code indicating that water is not entering the machine should that be the case.

    The machine will not tumble at the start of the cycle if the water has not filled the tub and the pressure switch is not in the full position. With the pressure switch in the full position, power to other components such as the drive motor is activated allowing the washer to advance to the next step of the cycle. The symptoms clearly indicate that the pressure switch is indeed stuck in the full position. Otherwise, the washer will flash a water fill error code and/or the cycle will not advance and tumble.

  • Jahn27
    Jahn27 May 17, 2010

    One obvious sign that the pressure is stuck in the full position is the washer will almost instantly tumble upon starting as it will no longer fill due to the fact the pressure switch is stuck in the full position and the control "thinks" water is already present and filled the tub.

    Regarding the wiring diagram or service manual you are requesting, I regret to inform you that Bosch appliances are the ones with the rarest service manuals to find. I would be more than willing to lend it to you if I have one. But the principle of operation is the same with all other washers.

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