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Most likely rotary switch. Because you have both air and liquid solenoid. If you only have liquid I would suspect solenoid is over pressured and can’t open.
I had a problem with led6 timers showing coin also and we determined it was interference from the coin acceptor and the electronics of the timer (led 6) Before crytopay we used led 5 and timemaster And never had this issue. We did talk with both slugbuster and Dixmor about this problem 6 years...