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The solenoid is rated between 6v to 12v according to what's written on the top, so easy enough to test just connect to a car battery. If it's ok it will click. Assuming the solenoid is ok it sounds like a fault in the wiring from the control box to the solenoid, or an internal fault in the solenoid control circuit on the control board, as it only happens when that part of the circuit is used.
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