Humidifiers and Dehumidifiers - Aprilaire 568 not turning on water.

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linger1
02-16-06, 03:40 PM
The water solenoid on my humidifier is not opening. I have cleaned the little black inline water filter and the yellow orifice is open. If I go to the test position I do not hear any click of the solenoid. With one lead disconnected, the Outdoor Temp Sensor reads 41.3 kOhm at about 35F, which seems about right according to the chart I read. I am suspecting the A50 current sensing relay because even though I have 26 VAC on the inputs to the Auto Track controller, there just appears to be 8 to 9 VAC to ground in the circuit when the blower is running. I disconnected the A50 and it reads 4.1 MegaOhms with the fan OFF and .3 MegaOhms with the fan ON.
Does that high resistance in the relay cause the low voltage in the circuit going up to the water solenoid? The resistance on the solenoid coil reads 34.7 Ohms. Is that normal or too high? Thanks for any assistance you can provide!

Jay11J
02-22-06, 07:15 AM
You have power going to the A50 relay?