To test solenoid, apply 24V directly to the terminals as see if water flows through it. Alternativly, turn everything on, ensure that there is 24 volts accross the solenoid wires, if you show 24Volts and no water, solenoid is bad. To test you will need to set your meter to AC Volts. If you have a separate black transformer supplying the 24 volts, hook that directly to the solenoid. You may also be getting the 24Volts from your furnace circuit board, if that is the case you will see two terminals usually marked HUMIDIFIER on the furnace circuit board (you will need to open your furnace usually 4 screws or so.) There is 24 volts there WHEN THE HEAT IS ON , run two new wires from those terminals to the solinoid and see if it passes water cuz that is when those terminals have voltage. Best way is with a meter though and if you have 24 volts at the solenoid AND no water, it is bad. If NO VOLTS, then could be the the humidistat or a disconnected wire somewhere in the path.
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To test solenoid, apply 24V directly to the terminals as see if water flows through it. Alternativly, turn everything on, ensure that there is 24 volts accross the solenoid wires, if you show 24Volts and no water, solenoid is bad. To test you will need to set your meter to AC Volts.
If you have a separate black transformer supplying the 24 volts, hook that directly to the solenoid. You may also be getting the 24Volts from your furnace circuit board, if that is the case you will see two terminals usually marked HUMIDIFIER on the furnace circuit board (you will need to open your furnace usually 4 screws or so.) There is 24 volts there WHEN THE HEAT IS ON , run two new wires from those terminals to the solinoid and see if it passes water cuz that is when those terminals have voltage. Best way is with a meter though and if you have 24 volts at the solenoid AND no water, it is bad. If NO VOLTS, then could be the the humidistat or a disconnected wire somewhere in the path.