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Miele G641 Plus Stops with INlet/Drain lamp on

7 posts in this topic

UNit is Miele G641Plus Dishwasher.

Drain/Inlet lamps lights soon after first drain and fill cycle.

Circulation pump removed and checked ok. Drain pump OK.  Sometimes the unit will complete its wash program, other times it just stops. The error code stored in the electronic has been F05 (Water drainage failure/ heater level switch) or F07 (Too few pulses at flow meter / end of water intake). However the water has NEVER failed to drain and the sump has never be too low on water. If I watch the cycle progress and it fails it's when the solenoid Valve (Y5) in the water inlet mixer is in operation. I dont understand why sometimes it operates during the first part of the program and other times it does not. The electronic has been set to "without softener".

Also I dont understand why the valve Y5 is in operation after the water inlet has stopped.

Its driving me insane. Just now it completed a wash program on the second attempt. I mean the first run stopped about 3 minutes into it. Then you just stop and start again by switching it off and it runs from beginning and completes the wash.

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Sounds like a finicky heater level switch (mounted to front of sump) - may also be a problem with the turbine in the water flow meter - how hard is your water ?

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Thanks for the reply.

whats the best method of checking the heater level switch?

Just replace it?

 

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No - use the control diagnostics, but the motor starts briefly during fill to trip the switch, if the water fill is too slow, it will fail to colse and log an error - once the machine is done filling, how much water is inside, could be as simple as a clogged inlet screen in the waterproof

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HI thanks again for the reply,

I have previously checked the the inlet screen in the waterproof. The water level appears correct compared to what I remember.

So you are saying the circulation pump starts breifly during the fill cycle to operate the heater level switch and if not enough water is available the switch will not operate and the machine will stop. Is that correct?

Would a variable water supply i.e. pressure changes perhaps cause something like this?

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Possibly, the unit fills for a short time and starts the pump momentarily - the control is looking for a trip from the heater level switch, it then completes filling and starts pump - if the control did not see a trip during the brief start it will register a fault. Heater level failures are somewhat common as they actually become clogged with gunk - if you are using the machine with the softener disabled and have hard water, this contributes to the cause

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Hey man,

Many thanks for the info. The machine has worked fine the last three wash cycles.

So I have no idea now. I'll just order a switch and wait for the next failure.

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