I live in a pretty old house and have a Carrier furnace with an Aprilaire humidifier attached to it. The device that controls the water flow, I guess it's a solenoid, is visible on the exterior of the contraption, yet it is very rusty. It is so rusty it just looks like a block made of rust that happens to have wires going into it. This is the 4th winter so finally I decided to see if it works anyway. Turned out it worked for a few weeks at 25%. Then it started getting "warmer", approaching 20 degrees outside, awesome. So I followed the chart and increased the humidity to 35%.
Increasing the setting to 35%, I found it blows the 3 amp fuse inside the furnace.
Would replacing the solenoid fix this? Or is there any other potential cause or incompatibility between the two systems?
If I replace the solenoid, I won't need it until next winter, assuming that it warms up between now and then.