So the furnace Skuttle humidifier is bone dry. I assumed the solenoid water valve was done after 18 years as was the sister-in-laws which I fixed. When replacing the solenoid valve I checked the 24V power to the solenoid with the furnace running and - nope - no power. There is water but no power. Dismantling reveals that the 24V comes off the Heil furnace circuit board - $150 for the replacement board. Anyone else experience this? I'm not looking forward to replacing that $150 board. I could install a sail switch and and external 24V power supply for considerably less but this is a p*sser.