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My understanding is that the rear wash is activated by reversing the polarity of the impeller, which in turn moves the rubber "valve" blocking the outlet to the front jets, operating the front wash is vice versa. I've changed both pumps and swapped them with each other and the fault is still...

I've come to the same conclusion, life's too short.

In an attempt to close out the thread with a conclusion. The saga so far, after changing the pumps for new and still experiencing what appeared to be completely random washing i.e rear washing when selecting front and vice versa and even sometimes working correctly. I came to the conclusion...

Yes, lol indeed! So frustrating! Could an intermittent short in the switch be the problem?

Last year front and rear washers stopped working, I followed the guide on here and repaired the pumps, they worked, but not brilliantly. I was probably a bit shy in trimming the rubber valve. Last week or so the rear wash worked intermittently then refused to work altogether. My assumption was...