Question about Bosch Dishwashers
When i select program it fills with water and then just hums. when reset it pumps water out and then fills again but just hums. I have taken the bottom out and there is no blokages. The pump at the bottom is turning (I take it that this is the same pump that cleans the dishes as does drain the water out)
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Posted on Jan 02, 2017
Most dishwasher have a check valve at the pump to prevent water from backing into the dishwasher. If the pump is electric there is a rubber flat that may be gone or not working properly. If that is the case you need to replace the pump. If the pump is part of the motor assembly then the pump and motor will need to be replaced. One other thing to make sure of is that you have the drain hose looped to the top od the dishwasher and then to the disposal conection. Its called a drain loop and all dishwashers should have it. Good Luck
Posted on Jul 12, 2007
If the washer is not used regularly the shaft can stick to the seals and prevent the motor from spinning. This happens quite regularly for me if I don't use the washer often. You can just take off the bottom panel - after shutting off power to the dishwasher - and access the motor. you should see some fins and then just try to spin the motor by hand. It usually takes about 90 degrees of rotation before the motor breaks free from the seal. You'll have to fight through the spring-like resistance created by the seal-shaft adhesion. After it breaks free the motor spins freely and you should be all set to go. I haven't found a more permanent fix for this other than running the dishwasher more regularly.
Posted on Feb 09, 2008
try removing pump some models can be serviced fron inside well of machine glass can stop the pump from turning
clean out water and remove filters find a screw in base of well remove and remove pump housing check with torch to see if any obstuctions there if not see if the impellor moves around when turned and make shure that the pump is not worn out
Posted on Feb 24, 2008
If you are still trying to sort out this issue try the following.
From what you say then it is most likely the aqua sensor on the side of the dishwasher. The gurgling sounds that you hear are likely the drain pump running and the un-drainable water sloshing in the sump.
Verify that there is actually water going to the dishwasher( Basic step but often overlooked)
Next the inlet valve will have to be checked. This is the part where the water line from the house connects to the dishwasher, under the toe/kick panel. Remove power from the dishwasher. Disconnect the dishwasher electrical connections (2 wires) to the inlet valve and connect it (carefully to 110 V power) using a jumper wire. With 110V power the valve should open and water will flow into the dishwasher, if not then the fault is in the inlet valve.
If this checks fine then the fault is likely in the aqua sensor...
On the outer left side (viewed from front) there is a panel, Behind this panel there is a small clear(of light blue) plastic mechanism with hoses and wires attached( There is usually a yellow disk at the top about 6cm in diameter) this is a float and sensor assembly there is tells the control the water level and works as an emergency drain if there is an issue. There will be a red stick protruding downward to the base and a Styrofoam float on which the stick rests. This is a pan overflow sensor if the stick is too high the unit will go into drain and cut off the fill valve power. The yellow disk is a diaphragm which senses water height. This unit can become stuck with wear and hard water.
Posted on Jul 28, 2008
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