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Bosch dishwasher drain pump cycling on off
Model Number: SHX43C05UC/50 Brand: Bosch Age: 5 - 10 years
I'm having a strange issue with my Bosch dishwasher, model number SHX43C05UC/50.
It has always worked fine since I moved into this home about 4 years ago. Yesterday when I tried to push the ON button to turn it on, nothing happened. Normally, the wash selection (regular, power scrub...) light will turn on. I checked the circuit breaker, and then verified 120 V at the dishwasher terminal block (junction box).
At that time (yesterday), I also noticed the sump was filled with fairly clean water. I cannot say whether this is normal... I have never really paid attention before.
Fast forward to this afternoon... My wife heard a clicking noise about once a second coming from the dishwasher. She pushed the ON/OFF button, and it stopped. When I got home from work, I verified that the dishwasher was turning the DRAIN PUMP on and off about once a second, whenever the ON/OFF switch was latched in the ON position. It will now do this with or without the dishwasher door closed. I was able to remove a protective cover in the sump from above the DRAIN PUMP IMPELLER. I can feel the DRAIN PUMP IMPELLER turning... stopping... turning.. stopping.... as I hear the controller relay clicking.
Strange thing is the dishwasher is not turning on any of the lights when I push the ON/OFF button. I would think that if it is turned on, and senses a condition causing it to cycle the drain pump on and off, I would get some sort of indication...
I don't know much about dishwashers, but I am guessing the controller is sensing water in the sump, turning on the drain pump, and then maybe sensing an abnormal condition (float switch? pressure switch?) and decides to immediately turn off the pump. Either that or maybe the pump is faulty? But I can hear a relay in the controller cycling the pump on and off....
By the way, I did check the drain hose connection to my garbage disposal under the sink and it looks fine. I have not pulled the dishwasher out to check the dishwasher-end of the drain hose...
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