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I have same problem with no water flow on identical humidifier but was able to fix it. Removed the inlet to the solenoid valve and found (1) a small taper mesh filter inside (2) a small diameter orifice that was clogged. Cleaned the miniature filter and used a sewing needle to open the orifice and now works perfectly.
Neither, even if the solenoid or humidistat stick, it should always drain properly. Is the unit mounted on the cold air return duct or the supply plenum? If it's mounted on the supply plenum, the water panel might be getting blown forward and spilling the water. High efficient furnaces also can leak water on the floor if its drain is restricted. If hum. is mounted on return duct make sure drain is clear by blowing through it. On Honeywell hum's I've seen the rubber hose from the solenoid valve to the distributor tray leak too, check the rubber 1/4" hose.
The first thing to check would be the filters in the house to make sure they are clean, then check for any blockage. One easy way of seeing if the airflow is good, just put your hands in front of a vent and see how its blowing. Your furnace has what you would call sensors, and if they sense the air flow is inaccurate or to hot inside the unit, the unit will run, but not light. Also, if it tries to relight to many times, the furnace will go into lock out and you have to manually reset it by cutting the power to the furnace. Its kinda hard to diagnose these sometimes over the pc, but I hope it helps.
Humidifiers usually are wired up to ONLY come on when the Heat is on and the fan running....anyother time you check it it will not be powered or wet...turn your heat on , wait till the fan comes on...then turn up your humidistat you should hear a click if its a flow through type and water should start flowing from the top...or if its tyhe drum style with the sponge...you should see it then turning...if it doesnt turn the pad/spindle may not be installed properly...if only fits one way
The furnace model is irrelevant. The important question is usually the dimensions of the opening for the filters. The most common sizes are 16"x25"x1", 20"x25"x1", 16x25x5, etcetera. There are exceptions such as specialty filters like electronic ones. I suggest using inexpensive pleated filters but you could just use filters that you cut to fit instead. Have a helpful gasfitter assist you if necessary.