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SYMPTOM
Humidifier operates constantly.
• If the humidity level in the home is less than the Humidifier
Control knob setting and there is a continuous fan call or
heat call (depending on setup), the Humidifier Control will
operate the humidifier until the humidity level is higher than
the Humidifier Control knob setting.
TROUBLESHOOTING PROCEDURE
• Set Blower Activation switch to OFF.
• In the “Test/Reset” mode, verify that the humidifier turns off
after 1 minute.
• Check the Outdoor Temperature Sensor resistance and
location, as instructed on the previous page.
• Rotate the Humidifier Control knob counterclockwise to the
“Off” position, and observe whether the humidifier turns
off. If the humidifier still operates in the “Off” position,
perform the following:
1. Check the wiring diagram for correct Humidifier Control
Installation.
2. Remove the wires from the “H” terminals on the
Humidifier Control. If the humidifier continues to operate,
replace the solenoid valve.
SYMPTOM
Humidifier or Humidifier Control “chatters” or clicks On and
Off rapidly.
TROUBLESHOOTING PROCEDURE
• Check for steady 22 VAC to 30 VAC across the “R” and “C”
terminals of the Humidifier Control with a voltmeter.
• Check, with a voltmeter, that the HVAC signal across the
“W” and “C” and “G and C” terminals of the Humidifier
Control is a steady 22 VAC to 30 VAC.
• Make sure that the Outdoor Temperature Sensor wiring is
not running alongside other wires carrying high voltage
(120 VAC or higher). (Automatic Mode Only)
SYMPTOM
Humidifier blower does not activate during Blower Activation
Test.
TROUBLESHOOTING PROCEDURE
• Set the Blower Activation Switch to “ON”.
• Check wiring diagrams for correct Humidifier Control
installation.