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Drain pump runs continuously. Nothing else happens!

Hi Bosch s10m1b - rotary control - drain pump runs continously. It does pump out OK, no blockage etc. Turning the knob slowly all the way round makes no difference. Any ideas, please?

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  • adrian932 May 17, 2009

    OK, I found out by searching other people's fixes! Tip the appliance backwards approx 45 degrees to drain the sump - the sump is in the bottom of the dishwasher and catches any leaked water. When the sump is full, the drain pump runs continuously and the machine will not work. I guess there must be a seal leaking, but at least I have the answer to the symptom! This seems to hold good for many makes and models, from what I can see on the net...

    Adrian.

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Water had accumulated in the sump - a plastic tray at the bottom of the dishwasher which catches any leaked water. This operates a float switch which makes the drain pump run all the time. The fix was to tilt the dishwasher backwards to drain away the water. It isn't filling up again, so I'm not sure where the water came from, but I'll keep an eye on it!

Posted on May 18, 2009

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Posted on Jan 02, 2017

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Hi - this is a strange one - I could be wrong here but I think that theres two likely possibilities for you - first is the motor controller board could be faulty - it may have a short on the switch ic for the drain pump - the other is there maybe an air lock or blockage to the pressure tube - remove the display panel to access the clear tube - unclip it & blow into towards the bowl to see if theres a blockage.

You say as soon as the start switch is pushed the pump runs continously? or does it come on as soon as the power button is pushed? either way I think the controller maybe faulty - haven't come across aything like this one before...

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Hello I have a Bosch dishwasher model no:


Hello Zub,

It's most likely a fault with the control module or the drain pump. Please follow these instructions to detemine the likely cause of the fault and, therefore, what to do next:

1. Turn the programme selector to any wash cycle but don't press start.
2. Open the door and pull out the lower rack
3. If the washer is dry, pour roughly a pint of water into the sump in the bottom of the washer
4. Locate the float (the mushroom) and lift it . . .

belectric_178.jpg
When the float is fully lifted (about 3/4 of an inch) the drain pump should start and drain any water from the washer. This activates the anti-flood safety feature and the pump should continue to run as long as the float is lifted. The power supply to the drain pump bypasses the controller so this is the best way to determine if the drain pump is faulty.

If the water drains when you lift the float . . .

The drain pump is working but it's not receiving the signal to start from the controller during a wash cycle. It may be a wiring problem, but more likely that your control module will likely need to be repaired or replaced. These cost about £100 - if you replace it yourself.

If you can hear the pump humming but water does not drain when you lift the float . . .

There may be a blockage somewhere or the pump impeller may have jammed or broken away from the driveshaft. Try lifting and dropping the float rapidly about 10-20 times. Repeated stop/start signals to the pump motor can free a stuck impeller.

If nothing happens when you lift the float . . .

There is either no power to the pump motor or, more likely, the pump motor has failed. You will need to test the motor to determine whether or not it needs to be replaced. You will need a Torx T20 screwdriver or screwdriver bit to remove the kickplate under the door and an ohm / multi-meter to test the motor.

The drain pump motor should give a resistance reading of between 110 and 260 ohms across the live/hot and neutral/common terminals if the motor is good. In most cases, the reading is about 160-170 ohms.

I'd suggest testing the drain pump using the float as detailed above, then let me know the results. I'm happy to provide further assistance once the likely cause of the fault has been determined.

Hope this helps.

Regards,
BElectric

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Does it also sound like the board is clicking? Your drain pump is bad. The control board is sending power to the drain pump, but the power is not being returned back to the control board to complete the circuit. I actually just diagnose this same exact machine about a week ago. lets just say it took me a while to figure it out.
Remove the cover at the bottom right of the dryer covering drain pump access area. Remove the hex head screw, and slide the bottom panel to the right and remove panel. Disconnect the power going to the drain pump. Turn the washing machine on, Should do the same thing you described above. Using a multimeter, check the power in the plug that you disconnected from the drain pump. Should read 120v. I' betting it will.
St your multimeter to check for resistance or better yet continuity. Touch each lead to the 2 pins on the drain pump. If there is no continuity or no resistance reading, then the drain pump is bad and needs to be changed. Once changed, your washing machine will run like new again.
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Hi,

The reason the drain pump continously runs is because it is trying to remove any water too avoid any further flood as there is a flood in the base of the unit which activates the float switch and constantly activates the drain pump until the water has gone. Isolate the unit at the power switch and remove the bottom panel under the door panel. Dry up the water as best possible with a towel. Run the unit again and check for any water leaks. You may just have over sudded the unit with too much detergent. Only use 2 teaspoons of powder. To start with while testing don't use any detergent. Good luck

Hope this helps.

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The first thing to check is the drain system. Check the drain hose at the back, and the drain pump. The drain pump can be tested advancing the cycle to drain. It can also be tested by a technician, energizing the pump directly.
The pump can be accessed removing the small service panel in front of the washer. Access to pump is located on lower right hand corner in front.
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