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Neff dishwasher - bottom tray not cleaning - rotary arm not turning

I have a NEFF dishwashsher S9J1F It's about 10 years old. The bottom tray is no longer cleaning properly eg cheese sauce saucepan looks like it has not been through a wash. I carried out some investigation. The bottom rotary arm is not turning during the wash cycle. I took it out and tested the water holes which do not appear to be clogged. It turns OK in the dishwasher when manually moved. Top tray working OK. What to check next?

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  • Claire Duncan Jan 10, 2014

    I called out a NEFF engineer to fix this.

  • Claire Duncan Jan 10, 2014

    The engineer explained that there is a gear mechanism which switches the water supply between the top and bottom water sprayers. He took out the top tray and water was coming out of the bottom rotary arm OK and it was turning.

  • Claire Duncan Jan 10, 2014

    The part which needed replacing is an "Instantaneous water heater"

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  • Neff Master
  • 34,814 Answers

If your dishwasher is 10 years old and you are facing a significant repair cost, it may be time to consider replacement.

Posted on Jan 01, 2014

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SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

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Posted on Jan 02, 2017

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SOURCE: Neff dishwasher not filling up with water

neff dishwasher will drain water goes in but the top and bottom spray do not work tablet falls in goes through cycle but will not wash. iangas

Posted on Aug 26, 2009

  • 4 Answers

SOURCE: Neff Dishwasher won't drain

I've had this problem a couple of times with my dishwasher. In both cases, the cause was a shard of broken glass that had managed to get past the filters and jam itself underneath the impellor. Hard to see, but easy to fix. First ladle out the water.
Pull off the lower rotor arm, unscrew the filter and take out the filter bowl, tray and cylindrical filter. Get as much water as you can out of the filter cavity.
Then, using a Torx-20 driver, remove the screw holding the impellor cover and lift the cover off. (this is the small bit of plastic at the left end of the filter cavity.) Check whether the impellor can rotate freely by spinning it with your finger several times - if it jams or grinds, then there's probably something jammed under it. (It may seem to be fine at first, so do check thoroughly, as any debris can move around with the water flow and only jam occasionally) You may have to use a cocktail stick or similar to poke out anything that's stuck underneath.
Glass is a particular problem, since it's almost impossible to see when there's any water around (it's easy to cut yourself too!)

Anyway, that's worked twice for me now - and I didn't have to even move the machine out of its cupboard to fix it.
Hope that helps.

Posted on Mar 14, 2008

  • 1462 Answers

SOURCE: neff dishwasher

if the arm is rotating freely when you give it a push by hand, then the problem is blockage in the jets in the arm - the arm only rotates with water coming out of angled jets at the end. take arm out, spray water in centre hole and whatever is blocking the jets should become visible. prize out with a paperclip or similiar

Posted on Aug 07, 2008

  • 1462 Answers

SOURCE: neff built in dishwasher

these arms rotate only by water jetting out of angled jets at the end. it is likely that these jets are blocked - not always obvious

Posted on Nov 10, 2008

  • 457 Answers

SOURCE: Dish washer problem

check water going into unit. disconnect to make sure there is a strong pressure going through.
check the water valve with a meter if there is continuity the valve is good. if not the valve is bad a no water water will go through. let me know if this helps

Posted on Feb 27, 2010

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