Forum Replies Created
-
Posts
-
I’m confident the reed part is working as it was before and now I’ve replaced it for good measure. That leaves 3 possibilities, the wheel is not turning fast enough or the magnet has got weak or the controller is not seeing the pulses from it.
All points to the flow meter, but surely as I’ve replaced the Reed and metered it out and can see voltage when water is flowing it seems to be working. Could it be that the wheel isn’t turning fast enough so it thinks there’s low pressure?
We do have incredibly hard water, maybe I’ll try and descale the mixing chamber, perhaps the flow meter is scaled up?Can’t be sure but this sounds like it may be the same thing and is doing the pulsed inlet, his was cured by flow meter.
https://www.ukwhitegoods.co.uk/forums/forum/public-support-forums/help-and-support/dishwasher-help-forum/870032-miele-dishwasher-stopping-as-inlet-drain-light-flashesOther people say it does react like that when the flow sensor is faulty? Only in my case I’m sure it isn’t.
So I finally got back there, I did your test albeit it slightly differently. I simply turned off the water at the mains isolator and ran the machine, you can hear the inlet valve open and then close again after 5 secs or so, the same as it does when the water is switched on.
This leads me to think it’s either something to do with the flow sensor (read switch already replaced and voltage can be measured when the water is flowing so seems to be working), the flow sensor circuit (again, voltage can be seen so not sure how it can be that) or the main board.
The engineer that visited is convinced its the flow sensor wheel, but I don’t see how it can be as a) it spins and b) when it’s spinning voltage flows through the reed switch.OK so I changed the reed switch and there was no change. I metered out the reed switch whilst the fill valve was open and can read voltage so the metering wheel is definitely turning and triggering the switch.
I’ve also checked the circulation pump is turning freely, checked the circulation pump pressure switch clicks when I blow into it (hard). I metered out various solenoids and none were open or short circuit and also made sure the flood switch clicked in and out (I didn’t measure it but I believe a fault with that causes the drain pump to run continuously).
Don’t know what else to try, the engineer is convinced it’s the mixing chamber but the only moving parts are the ball valve and the metering wheel so not sure how it could be that? It doesn’t look blocked.
Any idea what spec of Reed switch? Voltage, current rating? I work in an electronics company so may have something here but without dismantling the machine I’m not sure what type I want. Thanks for all the help.
Yes I saw in the manual it says the heater level switch is connected in series to the fill valve so if it’s tripping it will stop the flow.
Having said that I have done some more reading and found several cases of the same symptoms which were solved by a new flow meter. Maybe it looks for flow to start when the valve opens and if it doesn’t see any it closes the valve and reopens and checks again?OK thanks for your help, where should I look next? As I said the intake valve surely must be working as it switches on and off and water comes in at what would seem to be the normal rate.
What else is the machine checking for during the fill stage? Could it not be stop/starting because it isn’t getting the correct pulses from the flow meter?
The fill valve appears to be working as water comes rushing in when it opens but it then shuts after 5 seconds or so. This repeats about 5 times before the error is displayed.
I am wondering if the reed switch may be closing but with high contact resistance. The engineer is convinced the flow meter wheel is at fault, obviously a very expensive part to replace as it’s part of the fill chamber. I’m not convinced, the wheel spins very fast when water is flowing and the reed switch does register it but without using a scope it’s impossible to say it’s registering the correct pulses.
I may try soldering a new reed in to eliminate that as a suspect.
