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Hi Oh helpful people.
My Washing machine had started leaving powder residue on clothes 2 weeks ago, and yesterday the main motor failed to run at all.
After a trawl through the FAQs and previous posts I decided to check:
The belt – no problem there.
The brushes, plenty of life left in those.
The water level on wash – barely entered the drum – so I proceeded to check the pressure switch – it’s got 4 contacts, 2 of which are Normally closed and they open OK if I blow down the pipe.
There was a penny coin stuck in the filter, but the drain pump still works fine with no appreciable play.Questions:
Is the pressure switch supposed to have a closing contact too?
If the machine fails to fill properly will it just sit there waiting for more water , because the programme seems to complete without the drum turning at all.
Is there a way to reset the programme on these machines?PS I did disconnect the plug first.
PPS I have also just checked the motor windings – all OK.
Re: Bosch WFL 2260 first powder marks, now no spin.
Taking a wild guess here! make sure the water inlet valve(s) operate OK.
some machines use several valves and will still fill even with one defective. Often, a machine will have a preset time for an action and will then carry on regardless. sometimes, they’ll pause the timer until something else is completed…the pressure-switch can interact here!Blowing down a pressure-switch is likely to damage it….they are sensitive to a few inches of water-pressure- I’d guess you are talking ounces pressure, rather than pounds 😯
Use a multi-meter on Ohms scale to check the contacts….. somehow, the machine needs to detect water-level, to one or more pre-defined levels. it then needs to “tell” the machine to stop filling and start washing……also, you don’t want it to spin before it’s drained out most of the water. so, I think it’s safe to say that there will be a selection of normally open, normally closed and changeover contacts.
Not all are necessarily used,as one type may fit several different machines!
Generally, you will NOT get any technical info. from the makers or their agents….sorry, but repairs for us amateurs is often a long,steep learning-curve.I’m not a whitegoods engineer, so don’t take this as gospel.
Re: Bosch WFL 2260 first powder marks, now no spin.
Thanks Steve (a cockney in Oldham?),
I was gentle with the pressure switch, blowing down the pipe just sufficiently to operate the switch, without sealing my mouth over it (don’t you just love the taste of detergent)
I have also taken the processor board out now and checked it for tracking/burns – nothing obvious.When filling for a wash I can hear the drum filling and then the pressure switch cuts in to tell it’s got to the correct? level, then I hear the relays operating as for a normal wash so I think the pressure switch is working properly.
I suspect that since there are 3 relays, one of them may be duff. I think one of them must supply the motor, one must be for reversing it, and one for spin.
I’m a bit cautious of checking the motor voltage is being applied, it’s been a while since I worked with live mains circuits, I moved over to PC engineering 20 years ago.
I may just get a replacement relay from Maplin and change each one in turn, they look like basic 12volt changeover types.Re: Bosch WFL 2260 first powder marks, now no spin.
I meant to say, that some machines have more than one fill-valve and if the one feeding the soap-drawer is faulty, or you’re getting low pressure to it, this can mean the soap nott getting washed down properly.
M ay be worth blowing DOWN the tube to the pressure-switch…..gunge can plug it and cause intermittent problems.
You obviously know what you’re about, but this site DOES NOT APPROVE LIVE TESTING……no need to, why risk early death 😳To future readers, – unplug and wait 1/2 hour (YES you can still get a shock after it’s unplugged!)…. all normal testing can be done with a multimeterwith an Ohms scale.
Re: Bosch WFL 2260 first powder marks, now no spin.
AHA!
I think I may have found the problem.
I had previously checked the winding resistances on the motor, but on checking the motor plug that connects to the processor board, one of the windings is open circuit!
So it looks like a break in the cable or a poorly made plug….. looking for a pin to help with continuity checks…. watch this space.
‘When you have eliminated the impossible whatever remains, however improbable… Must be the truth.’ : Sherlock Holmes.
cockney steve wrote:
You obviously know what you’re about, but this site DOES NOT APPROVE LIVE TESTING……no need to, why risk early death 😳To future readers, – unplug and wait 1/2 hour (YES you can still get a shock after it’s unplugged!)…. all normal testing can be done with a multimeterwith an Ohms scale.
I was saying that I won’t be doing that!
Mains scares me, especially when combined with water and metal.
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