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Bosch washing machine drain pump noise. This machine is equipped with two pumps a recirculation pump and a drainage pump. Bosch washing machine spin cycle noise. Select the Drain programme.
I can reproduce the noise by setting the machine to programme 13 which is the cycle for pumping out the rinsing water. It starts about 20 seconds before it spins and when the machine stops spinning and reverts back to another part of the cycle the noise stops. If this does not work and you have already tried cleaning the drain pump please book an engineer to repair your washing machine.
Unclip the pump cover to find the black drain hose. Clean the drainage hose and the connecting piece of the siphon. Bosch Washing Machine Drain Pump Filter 00601996 601996.
In addition if the impeller is damaged warped or bent it can scape against the pump housing. The washing machine has started making a rattling noise when the water drains out and the noise seems to be coming from the drain pump. Check the pump filter to see if any obstructions are blocking it and remember a build up of lint or fluff can also cause the drainage pump to get blocked.
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Reading through postings I have found on the web the problem could be that something is stuck in the impeller of the drain. If you notice a strange noise when your washer is draining water then it is usually going to be a problem with the pump. Inspect the wash impeller for damage.