Miele W838 washing machine on/off switch not latching
- Thread starter Nigelfr
- Start date
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Pcb's don't have mechanical components.
You need a new switch module http://www.partmaster.co.uk/cgi-bin/search.pl?query=4764930&frmSFinder_headerSubmit=Search
Find a Miele supplier in France & quote the part number in the link.
I meant that I was surprised to find that there is nothing that holds the on switch in place once you've pressed it. I've pressed it many times, but now I can't remember whether it stays in or whether it just makes contact and then returns to it's initial position.
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So how does the machine stay on once you press and releasethe switch? Does it operate a rely? Or is it an electronic sort of latch on one of the pcbs?
In which case, how can I be sure that replacing the switch at almost £100 will solve the problem?
In which case, how can I be sure that replacing the switch at almost £100 will solve the problem?
Yes same machine: and since then the dishwasher that was on top of it has played up too!
I don't hold the on switch in long enough for the rinse light to come on. BTW cf the long "flashing rinse light thread" I checked the 6.3A fuse on the circuit board and it's OK.
I don't hold the on switch in long enough for the rinse light to come on. BTW cf the long "flashing rinse light thread" I checked the 6.3A fuse on the circuit board and it's OK.
Here's the RS page where both the relays under refernce RT114012 are to be found: http://uk.rs-online.com/web/c/?searchTerm=rt114012&sra=oss
Any idea which one I need?
In the worse case, I'll buy 2 of each and take one apart to compare with the original.
Any idea which one I need?
In the worse case, I'll buy 2 of each and take one apart to compare with the original.
I decided to test the relay on the board and it seemed to work OK. 9v across the coil and it clicked and the output contacts showed continuity. Take the 9v away and it went back to it's initial state. So that made me realise that it wasn't a latching relay, so there must be some latch on the switch.
Out it came again and I noticed a small yellow bit of plastic on the side which slide out. Turned it over to find that it had a series of grooves. There is also a pin protruding from the switch that must run in the grooves.
What I think happens is that as you press in the switch, the pin slides in the grooves and rests in a notch, holding the contacts of the switch in place with the contacts on the pcb. When you press again, the pin slides out of the notch and the contacts are free to return to the off position.
However, this is only a guess, as there doesn't appear to be a notch where I expect one to be. I think it may have been worn smooth, so I've fashioned a replacement out of some aluminium foil and Araldited it in place. I'm writing this while it sets, so will report back later.
Out it came again and I noticed a small yellow bit of plastic on the side which slide out. Turned it over to find that it had a series of grooves. There is also a pin protruding from the switch that must run in the grooves.
What I think happens is that as you press in the switch, the pin slides in the grooves and rests in a notch, holding the contacts of the switch in place with the contacts on the pcb. When you press again, the pin slides out of the notch and the contacts are free to return to the off position.
However, this is only a guess, as there doesn't appear to be a notch where I expect one to be. I think it may have been worn smooth, so I've fashioned a replacement out of some aluminium foil and Araldited it in place. I'm writing this while it sets, so will report back later.
The only relay that gives problems on this pcb is 6k1 (the motor reversing relay), especially with a heavy/unbalanced load. One set of relay contacts gets welded shut & it pops a 6.3A radial fuse. But that has nothing to do with your issue. I still believe you need to change out the switch module...even if it is expensive.
You're right that I need a new switch: the pin that engages with the grooves in the yellow bit of plastic is so short that it isn't held by the Araldited notch.
So I've ordered a second hand switch. In the meantime I've taken the yellow and white knobs off and refitted the spring for the on/off switch so that it exerts less return force. That way I can hold the switch in with some duct tape whilst the secondhand switch makes its way over to me.
So I've ordered a second hand switch. In the meantime I've taken the yellow and white knobs off and refitted the spring for the on/off switch so that it exerts less return force. That way I can hold the switch in with some duct tape whilst the secondhand switch makes its way over to me.
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