Miele W504 - fills, tumbles, then drains then fills then drains constantly.

[PhillipJeans]

Hi. I'm stumped. I've done lots of repairs on this washing machine but this one has got me. Miele W504 fills, tumbles, drains then fills then drains. It then stays in this fill-drain cycle forever more There is some clicking from the water path control valve but this was cleaned and lightly lubricated with silicone grease recently. Some wear to the plastic gear teeth but not excessive. No fault code or light. Inlet filter is clean. Outlet hose is not submerged causing siphon effect. Inlet water flow rate good. Discharge pump and hoses and suds box at back all clear and clean. New inlet water valve. Not sure where to look next.

Any suggestions welcome.

Phillip

 

[Wayners]

Controler just starts again in a loop. Maybe that needs replacing although I'd expect an error code

 

[jj4091]

Does it work ok in spin or drain and spin only mode or is it the same in all modes

 

[PhillipJeans]

Does it work ok in spin or drain and spin only mode or is it the same in all modes

I can't check now annoyingly. I''ve just had the front off to ensure that everything was definately clear and see also that the water path selector was working but now when I switch it on, it just keeps draining even though it's empty. I left it for 20 mins to see if it would stop but didn't. It's like it's no stuck in part of a cycle and doesn't know what it's doing.

 

[PhillipJeans]

Does it work ok in spin or drain and spin only mode or is it the same in all modes

Does it work ok in spin or drain and spin only mode or is it the same in all modes

I can't check now annoyingly. I've just had the front off to ensure that everything was definately clear and see also that the water path selector was working but now when I switch it on, it just keeps draining even though it's empty. I left it for 20 mins to see if it would stop but didn't. It's like it's no stuck in part of a cycle and doesn't know what it's doing.

 

[PhillipJeans]

Controler just starts again in a loop. Maybe that needs replacing although I'd expect an error code

Thanks. The W504 Premier model doesn't have fault codes. Just lights, but on this occasion there are no fault lights.

 

[Wayners]

Just saying this. You may already know..
Lights can be a fault code. Some lights on and some off can be looked up online.

Also there are engineer program modes. Machine runs through everything in about 5 or 10 minutes and stops when he gets trouble. I've not had much luck in finding these engineer running codes online. You get them by pushing buttons in certain order...

 

[PhillipJeans]

So the original fault has gone into second place and the new fault it 'check drain light' and the drain pump runs continuously. This may have been something to do with me cancelling it mid way through whatever cycle it was stuck on previously, and then dissassembling the water control path valve to sheck it wasn't stuck. So perhaps the machine doesn't know what part of what cycle it was on. I've tried switching it off, then turning the dial to finish, then back on again. This does not clear the drain fault.

 

[jj4091]

https://www.diynot.com/diy/threads/miele-premier-500-w504.359923/ this post shows how to put a Miele into diagnostic mode in one of the threads. Not the same model as yours but possibly the same procedure. Once in that mode you should be able to test various functions and possibly reset the machine. The only other thing I wondered if you had checked was the pressure switch.

 

[PhillipJeans]

https://www.diynot.com/diy/threads/miele-premier-500-w504.359923/ this post shows how to put a Miele into diagnostic mode in one of the threads. Not the same model as yours but possibly the same procedure. Once in that mode you should be able to test various functions and possibly reset the machine. The only other thing I wondered if you had checked was the pressure switch.

Thank you. I will definitely try this. I presume the pressure switch is in the 'mother board' as there is a plastic recepticle at the bottom front of the drum with a hose connecting it to what could be a transducer soldered directly on the back of the board. I did check the hose and plastic moulding for blockagaes and there were none. If the pressure transducer has gone (if that is indeed what it is) then it's either a new board or I risk unsoldering what is there, testing it then either replace it or solder it back on. I didn't see another pressure switch looking object in there unless I missed it.

 

[PhillipJeans]

Thank you. I will definitely try this. I presume the pressure switch is in the 'mother board' as there is a plastic recepticle at the bottom front of the drum with a hose connecting it to what could be a transducer soldered directly on the back of the board. I did check the hose and plastic moulding for blockagaes and there were none. If the pressure transducer has gone (if that is indeed what it is) then it's either a new board or I risk unsoldering what is there, testing it then either replace it or solder it back on. I didn't see another pressure switch looking object in there unless I missed it.

Sadly this service mode doesn't appear to work. It's either becuase it's still confused or becuase it's the wrong combination of buttons for this model. I've just checked the inlet water valve (replaced a couple of weeks ago) is now broken showing open circuit. What could cause this to fail so quickly unless it's just a poor quality part from Fixpart?

Phillip

 

[jj4091]

Sorry I can’t suggest anything else but your symptoms do sound like a pcb failure Perhaps calling Miele might help