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Hi, I replaced the triac and the supply voltage has become 220v. Nevertheless except for first test cycle the error came out again. Then I measured the voltage coming out from the switch which should be 220v when closed and zero when open. With my surprise the voltage was around 180v when open. Then I checked again the microswitch (a CHERRY CB1). The resistance was zero when close but not infinite when open. My error was to measure the first time by a 2M ohm full scale instrument instead using a 20M ohm full scale I detected a 19M ohm resistance. In consequence the triac was always conducting. I disassembled the switch clean the casing, warmed up it and the resistance became infinite. I checked it on the machine and it was fine, but the next day the problem with the switch came back. At this point I replaced the flow controller (price 35 EUR – 30 GBP) and this solved the issue. Then the source of the problem was the cherry CB1 microswitch.
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