Update.
Measured the resistence between pin 2and3 from the watervalves to pin
23 and 21 in the white connector from the control unit. Both wires are oké. So the wires are able to deliver the minus to make the valves close. The problem must be in the control unit or further back. I removed and opened the unit to find it in the condition you might expect. Looks clean exept for the two big resistors. The surrounding there turned into a darkened brown. They are known to become very hot. But everything looks oké. I know it means nothing but there are no cracks or loos contacts. I measured the pins 21 and 23 from the outside to the inside connections on the cirquitboard but also they are oké.
I now know the correct specifications of my control unit so I go and find me a spare one.
Does anyone knows if the two resistors are related to the behaviour of the watervalves?
Keep you posted.
Henk.
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