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Hi,
The machine is a G5500, which I got second hand 5 years ago. Last year there was an F14, water intake fault, that was resolved with a replacement/used heater pressure switch.Recently it stopped with a F24, heating relay contact fault, I dismantled and cleaned the relay’s contacts. It ran without issue for one cycle, so I assumed it was fixed. I wasn’t around for the following: the next cycle stopped part way and displayed “Inlet”. Next run displayed F84, Slide shutter positioning fault. Next run ran for only 2 minutes, the same process repeated a number of times and then the mains circuit RCD tripped.
In service mode, fault memory shows: F11 Drainage fault, F14 Water intake fault: heater pressure switch, F24 heater relay contact, F52 Heat pressure switch has reset during heating, F63 Slide shutter fault, F84 slide shutter positioning fault, F85 slide shutter signal change fault. I am not sure when this was last reset so some of these faults may not be related to this issue. I cleared the fault memory and no further faults have been recorded during the fault finding. Still in service mode, I have been using the component test V02:K1/1, heating relay, this immediately trips the mains circuit RCD.
I’ve gathered some more data but not sure what is correct behaviour vs component error or if the problem is elsewhere. I checked inside the circultation pump and heater pressure switch for debris, both are clean. Unplugging the outlet cables on the heater relay, no trip. Unplugging the heater in the circulation pump assembly, still trips. Unplugging either the blue or brown cable that are part of the control cable harness attached to the heater pressure switch, no trip. The circuit board must monitor the heater relay to produce F24 faults, so I assume mains voltage on these cables is correct behaviour. As the mains voltage on these cables is now causing an RCD trip I wonder if the issue is with the control board.
Any suggestions or pointers to Miele wiring schematics are more than welcome. In case it is of use to others, I’ve used this technical information for fault codes and to access the service mode.
Many thanks,
Rod
Thanks for the suggestion. I unplugged the heater from the heat relay and the RCD still trips. So while I haven’t tested the heater element that isn’t what is causing the RCD to trip.
Since posting, I have stripped out the control module and there is no visible evidence of overheating. So I’ll assume the control board isn’t damaged and that something broke just before the first RCD tripped. The description is that the machine was making the same sounds repeatedly about 2 mins into the programme and after 5-6 occurrences the RCD tripped. To narrow things down I’ll see if I can cause the RCD trip with other single component test programs and/or prevent the RCD trip by removing components from the control harness. As there were several faults related to spray arm water control sliders I wonder if the motor that moves the sliders is damaged.
as long as you are sure you have disconnected both wires from the heater then i agree its not the heater
next most common component for tripping is the motor
Dave
electrofix wrote:as long as you are sure you have disconnected both wires from the heater then i agree its not the heater
next most common component for tripping is the motor
Thanks again for the heater suggestion. I went back and restested all the components down stream from the heater relay. The problem is with the heater pressure sensor. The testing was inconsistent yesterday as the fault only occurs reliably when the body of the sensor is full of water. I think maybe something was bouncing around in the circulation pump causing the slider shutter faults and also damaging the pressure sensor. I’ve had to replace a previous circulation pump when a sliver of glass was wedged behind the impeller, which damaged the seal on the motor shaft.
Thanks again,
Rod
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