Hello.. I have measured 55volts across W and C on the Furnace. Is this normal? I noticed that the problem goes away if i disconnect W. (The problem is that a correctly wired Aprilaire 500 with digital control is causing the furnace to run constantly).
Should W have voltage on it while the furnace isn't running?
W reads 55volts at the furnace but only 24volts at the humidifier end. Is this right?
FYI when i disconnected W, the humifier--with the Blower Activation Feature enabled--properly ran the furnace blower-only during the test cycle. With W connected, the humidifier properly tests and works but the furnace won't shut off.
Thank you, Dan