Plot thickens! I have done a bit more investigation and peered down the hole in the sump unit that feeds the top spray arm. There appears to be a shutter valve arrangement. I fiddled a little bit to see if it moved - it did a little. Then I put the fittings back in and switched on the machine...
I have just posted a similar problem with my Bosch Excell Dishwasher too (6 years old). I have tried quite a few things. I suspect it may be too much friction caused by wear on the surface between the spray arm and the hub that locks it in place, however I am not sure. I think I am going to...
Please can anyone help. The top spray arm is not rotating in my dishwasher. Became aware when dishes were not cleaned and were covered in a gritty deposit. Fills and pumps out with no problem.
Plot thickens! I have done a bit more investigation and peered down the hole in the sump unit that...