Hello
I have been trying to repair an old (11 years) dishwasher, it is a Miele G1040.
The symptoms are that it starts, drains the old water, intakes clean water, and starts the jets. The jets operate for about 10 seconds. Then they stop. This start/stop of the jets continues approximately 10 times. Then it flashes all 3 orange lights, drains out the water, and stops.
I have done some more fault diagnosis and repair but the problem still exists
1) Firstly I removed and repaired the water pressure valve which had water inside, cleaned it and resealed it, made sure it works (by blowing on it while testing with the multimeter) and you can actually hear it click when the circulation pump goes.
2) Secondly I removed and repaired the heater relay, it was all blackened and carbonised inside, I brushed the contacts clean, it's like new. Its coil is fine and you can also hear it/feel it activating.
3) I removed and tested the water temperature NTC, it works as described, around 13K Ohm at 23C and goes down with temperature increase.
4) I measured the water heater element, it is 24R, at 240V it would draw 10A, therefore 2.4KW, exactly as stated on the plate
5) During the "fault", when the water jets operate, 6 seconds in, the computer tries to activate the heater, you can hear/feel the relay going, and you can see an intake of current (up to 10A), but it is momentary, it cuts out almost immediately, the water jets operate for another 3 seconds and then the "stop/start" cycle ends. It does this around 10 times before giving up.
It seems to me the machine is fine, it goes through its normal steps, and when it comes to heating the water, it tries, there is a flash of incoming current, but for some reason it stops almost immediately.
There may be another sensor which the machine consults and it forces it to cut out. I have not seen any on the diagram however.
Any help appreciated.