I have a Honeywell House humidifier HE 225A-1006. As soon as the heat turns on water begins flowing through the filter even though I have the humidistat turned to off. If I turn the humidtsta toabout 55% I hear a click and if I bring the humidistat to off it does not matter the water continues to flow. If heat is truned off the water stops flowing. Could this be a bad solenoid valve. Part # 32001639-002.
Turning the heat on immediately causes the water to start flowing again. Its as if the solenoid is stuck in the open position and allows water to flow as soon as the heat is truned on. It worked good fro 2 years until I started it up this season.
In order of probability:
1) (incorrect wiring) Make sure that humidistat is in SERIES wired with the furnace.
2) (shorted wires) Check that two wires to humidistat are not touching...use your glasses if you need them!
3) (bad humidistat) disconnect the humidistat and put an ohmmeter accoss the two terminals when it is turned on you should read 0 ohms, and when off it should read infinate ohms, if not pass both these tests, you need new humidistat.
That is it, there are no other possibilites!
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