Is it normal or abnormal? Any solution?
I has the same problem with my HE360 unit. The unit was in fact miswired. The head unit red wires were connected directly to the blue solenoid wires, and activated the solenoid without any signal from the humidistat. As soon as the unit is plugged inn, the water starts running without any signal to the unit. If your unit is miswired, the soleniod blue wires need to be cut and connected to the red crimp connectors.
I had the same problem with my Honeywell HE 265. I ordered part number 32001639-002 from simplyplumbing.com and fixed it today. The solenoid is the same for the HE 220. You'll need a torx screwdriver and a 5/8" wrench. Doesn't matter how you re-attach the electricals, they're DC.
No turn the furnace switch off (the light switch near furnace, if water continues replace solenoid valve. Afterward you adjust to a slow trickle when calling for humidity, anymore is wasted water.
Unless you are using a current sensing relay or sail switch, you need to get the humidifier power from the blower motor supply so it only operates when the blower is on.
Since you can manually control the humidifier, there is not a fault with the solonoid.
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