Either 120 VAC or 24 VAC . You are reading 5.5 VAC ? Can you get to the wires going to the solenoid , detach them and check the voltage on them , not connected to the solenoid ? I am guessing it should be 24 VAC . If so , I am guessing the moving part that is moved by the electromagnetic field of the coil , is " stuck " . This will cause the coil to draw higher than normal amperage , possibly dropping the the voltage .
If the voltage in the wires , no load , is significantly below 24 VAC , then there may be a problem with the device switching the circuit to the solenoid , causing higher than normal internal resistance ( perhaps burned / oxidized contacts
) .
Originally Posted By: SHOZ
If it's 5.5v with it unplugged from the solenoid the problem is the wiring or power supply.. 5.5V with it plugged in would mean the solenoid is bad.
Yep . Kind of what I was trying to say .
If the water is vert hard , like ours . The sliding part of the water valve , that is caused to move by the magnetic field of the coil , may be stuck . Might or might not be able to repair it . Perhaps soak the valve mechanism in vinegar or citric acid ?
Would still be curious as to what the amperage is .