Zanussi DW907 stops early in cycle

[belgarboy]

Hi,
When I start my dishwasher, it fills OK then starts to wash. After about 2 minutes it stops. It’ll sit there all day and do nothing. The heater element checks out OK (about 23 ohms). I was going to check the float switch next but it’s hard to access and it has 4 wires coming from it; I expected 2. Before I do this does anyone have any ideas as to the problem? When I manually click around the timer it starts washing again and then drains OK. Not having a wiring diagram is a killer. Can anybody help?
Many thanks

[MrCookie]

Re: Zanussi DW907 stops early in cycle

Syphon tubes possibly, remove the metal filter, just to the right and foward of the lower spray arm connection is a clearish plastic cap with one philips screw (non magnetic in it, remove this DO NOT drop screw you may not be able to retrieve it, remove the plastic u bend tubes and flush through with hot water, refit and keep fingers crossed 😉

Simon

[belgarboy]

Re: Zanussi DW907 stops early in cycle

Thanks Simon, I removed the 2 blue tubes plus the cranked tube and removed no end of crud. Replaced everything but it still doesn’t work. It looks pretty horrible in there generally though. For good measure I also removed and cleaned the horseshoe shaped tube and the mounting spigots that sit underneath the blue tubes, but still no luck. Any more ideas?
many thanks
Peter

[MrCookie]

Re: Zanussi DW907 stops early in cycle

Hi
What happens if you click it on one notch on timer, does it do this for rinse as well as wash, it’s not anti flood as that will constantly run drain pump, heater failure or over heat stat failing will just cause m/c to constantly wash without moving on, does the dispenser open.

Simon

[belgarboy]

Re: Zanussi DW907 stops early in cycle

Hi again Simon,
I ran it through on the rinse cycle. Here is what happened. The washer filled OK and then washed for about a minute. Then it started taking in yet more water to the point where the washer started to leak around the door because the machine was actually filling up! So I clicked the timer around until I found the drain.

On the main wash, the washer wouldn’t take it any water this time. It seems to have a mind of its own. Now I’m really puzzled.

Thanks very much for any help you can give

Regards
Peter

[Simon46]

Re: Zanussi DW907 stops early in cycle

Alll explained Here
http://www.ukwhitegoods.co.uk/modules.p … ge&pid=104

S.

[belgarboy]

Re: Zanussi DW907 stops early in cycle

Hi again Simon,
many thanks for the help. Cleaned the blue tubes and the horseshoe shaped tube under the machine. Still no luck. Removed a 2 chamber plastic affair (one of the chambers is where the salt goes in). The salt chamber is very clean, the other is 60{e5d1b7155a01ef1f3b9c9968eaba33524ee81600d00d4be2b4d93ac2e58cec2d} filled with muck. Is this the IWMS? It’s impossible to flush clean. There is a switch mounted on it – is this the air activated switch referred to in the article? If so all this muck is probably somehow causing it not to operate correctly.

If all this sounds reasonable then I will try and find a new part. What do you think?

Once again, many thanks for all your help
Regards
Peter

[Penguin45]

Re: Zanussi DW907 stops early in cycle

Your machine is a “blue tubes” machine – it does not have an IWMS. The pot full of muck is the water softener unit and plays no direct part in the fill process – put it back and leave it alone.

The tubes are used to displace air into firstly the pressure switch. This is what the short tube does. The longer tube diverts air into the pneumatic shut off on the fill valve, in the event of the pressure switch failing or becoming blocked. If the machine now overfills to flooding, neither system is working and you must have an air leak sonewhere.

Penguin45.

[belgarboy]

Re: Zanussi DW907 stops early in cycle

Thanks for the reply. I re-assembled the machine and tried a rinse cycle. It fills to the correct level now and washes but then stops. Manually clicking it on one notch resumes the cycle. When I tried on a hot wash though, it wouldn’t even fill. Any more thoughts?
Thanks
Peter

[Penguin45]

Re: Zanussi DW907 stops early in cycle

Yes, it’s probably shutting off on the pnematic shut-off on the fill valve. The next step is the machine waiting for the water level to register on the pressure switch.

If you listen carefully, you may well be able to hear the fill valve humming.

Penguin45.

[belgarboy]

Re: Zanussi DW907 stops early in cycle

Yes, I can hear the fill valve humming. What do you think I should do next?
Regards & thanks
Peter

[Penguin45]

Re: Zanussi DW907 stops early in cycle

That proves that the “long” tube side of the system is working. The “short” tube is not. So, system not cleaned out properly, air leak, level switch not working are the possibilities.

Stay safe, power off when you go back in.

Penguin45.

PS: You have put the tubes back the right way round……………….

[belgarboy]

Re: Zanussi DW907 stops early in cycle

Checked the tubes again. They are thoroughly clean. It seems not possible to put them back wrongly as they are handed. So we are down to an air leak or a faulty level switch. Finding an air leak would be next to impossible I’m guessing?….so I’d like to check out the level switch. Could you tell me where it’s located and how I can check it out?
Thanks, Peter

[Penguin45]

Re: Zanussi DW907 stops early in cycle

Follow the skinny hoses from the front of the sump moulding – one goes to the valve, one goes to the pressure switch.

Penguin45.

[Simon46]

Re: Zanussi DW907 stops early in cycle

Check there isnt water in one of the tubes.

S.

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