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Dales-Electronic
Dales-Electronic, Home Appliance Technician
Category: Appliance
Satisfied Customers: 1464
Experience:  I am a Home Appliance / Refrigeration Technician of 25yrs+ with my own business and for multi-brand national companies.
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Bosch dishwasher classiXX. Intermittently doesn't drain

Resolved Question:

Bosch dishwasher classiXX. Intermittently doesn't drain either 20min from - or at end of cycle. Impeller moves freely, no debris around impeller, flexi drain pipe not blocked, house drain not blocked. Plastic 'flap' near impeller moves freely. Motor works on bench test.
What else could it be?
Submitted: 11 months ago.
Category: Appliance
Expert:  Dales-Electronic replied 11 months ago.

Have you checked that the pump is actually receiving power? If not disconnect the pump wires and with a multimeter check if power is being supplied to the pump during the end of cycle pump our or initially on start up of the program (first few seconds) - Ian

Customer: replied 11 months ago.
No, having now assumed that an input condition is the issue, maybe a sensor is preventing the pump to be commanded to drive??
What sensors/blocked air pipes might there be - to stop a vacuum being created if this could be a factor?
Expert:  Dales-Electronic replied 11 months ago.

It is much more likely to be the power cables to the pump, the pump itself or the main pcb that is at fault. If as mentioned earier you start the appliance the pump will pump for the first few seconds, certainly within the first ten after start up irrespective of sensor input.

Customer: replied 11 months ago.
ok, with that in mind, I have 'stretched' the relevant pump conductors within the loom around the door hinge whilst completing a continuity check - none appear broken. I have wired a simple neon across the pump terminals in order to remotely view when the pump is energised. It runs (light on) at start for around 10 seconds when m/c started a rinse and on this occasion emptied the m/c at the end. I will monitor the neon and advise further.
Expert:  Dales-Electronic replied 11 months ago.

OK I await you observations.

Customer: replied 11 months ago.
The dishwasher has worked all week - until this morning!! The display indicated 49min left and the water was not pumped out. On a positive note, my slave neon was on indicating 230V across the pump terminals. It has since worked this afternoon. I will order and replace the pump.
Expert:  Dales-Electronic replied 11 months ago.

OK would you at this point rate the information given sofar, once done all further questions are free of charge. I would if I were you check the actual voltage across the pump connectors. A neon will work from about 80volts upwards - the pump however will only rotate from about 180volts upwards.

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