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Why won't my FM Humidifier Come On?

"FM Humidifier Not Coming On

Models affected
FM 35 – 50 KW

Symptoms
Room humidity Low, Electrode Carel Humidifier Set-UP, Humid Setup may read Current 0.0A, Conductivity 0microS/cm
Demand 100%
Actual 0%

Cause
The root cause for this issue is wiring on the back of the humidifier control board have come loose. There is no communications with humidifier and the Nome Board.

Solution
1. Check to see if the LEDs are on the humidifier board.
2. Check voltage at P73-1, with 100% demand there should be 24 volts there.
3. Check voltage at P73-3
4. Remove the board and check for loose wires.
"
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