Zanussi DWS 939 Dishwasher

Dose not empty after wash cycle. If the program rotary switch is turned it can start an empty function. The motor is new as the previous one seized up due to seals leaking.
Most of the comments about this kind of fault refer to the end impeller blades being damaged, but this is a brand new motor assembly.
Could this be due to a contact problem in the rotary program switch ?

Not had much luck with Zanussi dishwashers.

Comments appreciated ASAP

Regards flounder

You can get more specific help with your model if you post the product (PNC) number

Most dishwashers have 2 pumps, one for circulation and one for draining.

When you switch on the machine initially does the drain pump operate (it should do)

Thank you Leccy

This is a single motor combined pump, circulation and on the end of the unit the drain out pump.
On first swithing on there is a pump out function.
A significant point is that the control knob, if turned to the Red end of cycle wedge, will mostly pump out energetically.
This suggests that the pump blades are OK. The motor assembly is new.

Therefore I am thinking that it is a switch contact problem. Any suggestions on this would be appreciated.

Thanks again flounder.

This is very frustating !

We thought all water was pumped out the other day. But when the door was opened there was a stink

The water level was just under the bottom filter and was filthy ...

Still think the switch is faulty

Can anybody advise how to get at the switch ?

Can this be adjusted ... micro switches etc.

I think the door latch is a bit tricky.

Help appreciated.

Regards flounder

As Leccy said...you need to post the machine PNC number. There are 6 - 7 different variants of the DWS 939.

Just look at the date !
Put up with this intermitant draining problem all this time ..

After the bearing and seal packed up on the pump it was replaced recently.

Ihe impeler blades on the old pump were in good condition.

I thought the new pump would solve the problem .. But the intermitant draining is back.

Output drainage is clear. But i wondered if the vertical drain tube could be to high.

Advice appreciated

flounder

Just done a drain test, again, and checked the outflow of the machine.
The pump out was powerful and had a head well over the height of the drain pipe.

The input to the drain has a “splitter” Y connection and is fed from the washing machine one side and the dishwasher the other. There was a tiny bit of scum inside which I removed.

So! After this minor service we are back to wait and see; if the machine empties.

Being intermittent it is very irritating.
Therefore, if the fault is still there suspicion is back to the program switch.

If anybody out there has any experience of program switch faults, or any other ideas, I would appreciate some advice.

flounder

Here we go again !

After weeks of working OK .. back to no pump out.

Now with egg on face. Another theory bit the dust.

Convinced that the problem was due to an intermittent micro switch I replaced the Timer at great expense.
It worked fine, cracked it ! brownie points ! for three weeks !

BUT now back to intermittency … fails to pump out, at end of green wedge, after final rinse, just before the heat cycle, red wedge.
The heating period ends, water in bottom

Rinse and hold .. OK

I desperately need a circuit diagram for this model, and any suggestions appreciated.

Zanussi DSW 939 Type 911N81-2F
Prod No 911883002
S No. 82900111

Regards
flounder

Hi Leccy

If youn are still there. I cirtainly am, and still have this intermitant pump out.

We were advised to have tthe Timer replaced, at great expence. A few days latter Wife said "It's not emptied !!

Some details :-

Zanussi DWS 939
Prod No. 911883002
Type 911N81-2F
SNo. 82900111

Intermittent pump out.
New motor. Very good pump out head when testing.
New Timer.
Foul water left in bottom, most occasions.
I am a retired elec’ engineer and fed up paying out to experts!.
Desperately need a circuit diagram to fix this myself. And good advice.
Regards

rsvp asap

Ihave posted this also on fixya. No reply

Hope you are able to help with this

Leccy758 said:

You can get more specific help with your model if you post the product (PNC) number

Most dishwashers have 2 pumps, one for circulation and one for draining.

When you switch on the machine initially does the drain pump operate (it should do)

Click to expand...

The saga continues :-

This problem has fooled me since it seemed intermittent.
We complained about the terrible stink although the rotors and water circulation while washing was quite powerful.
Just found service invoices going back to 2002.!!!! the single motor was replaced by Zanussi service under guarantee. I did suggest that I doubted that it was a motor problem.
Local experts insisted that the a timer microswitch was the fault so it was replaced
There are two of us in the house most of the time so the DW not loaded with many dishes, so the replacement seemed to have fixed it. Then a period of non-use and it might stand unused for say a week, then the smell. I found quite a lot of foul water left under the tray. But if only a few dishes had been washed regularly the smell was not apparent. So it was not fixed !
After all this time I did a “coffee test” mixing a very strong instant type, selecting the usual B program, listening for the water fill to start, then pouring in the coffee as a marker. Went to bed.
Next morning I found quite a dark liquid in the base of the DW. Yet the program has two rinses.
Opening and closing the door while pumping out I was surprised to see large rotor activity with copious water being circulated in the DW. I could hear some drain output.
My conclusion is that the pump out head pressure is being bypassed, and being a timed function, it literally runs out of time. The end product left in the DW is a left over of the last rinses. The two rinses being partly diluted with fresh mains input.
There is always going to be a residue old foul water.
What is the answer ? I have posted on “justanswer”.. No answer !
The Zanussi build is very good BUT it dose not work.
This SOB has a design fault IMHO. If I don’t solve this within a week it’s off to the TIP
Unless I get some good tips here

Regards flounder