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SYMPTOM
Humidifier operates only in “Test/Reset” mode
• If outdoor temperature is greater than 60°F or less than
-30°F, the Humidifier Control will only operate in the
“Test/Reset” mode (for 1 minute).
• If the humidity level in the home is higher than the
Humidifier Control knob setting, the Humidifier Control will
not operate the humidifier.
TROUBLESHOOTING PROCEDURE
• Measure the resistance of the Outdoor Temperature Sensor
by removing the leads from the Humidifier Control terminals
and measuring the resistance across the wires with an
ohmmeter. Confirm the reading with the temperature in
Table 1
. (For Manual Operation, verify that the resistance
across the leads of the Manual Mode Resistor Case is
between 44K and 48K ohms). Reconnect the ODT leads.
If the resistance value does not match the temperature
value, replace the Outdoor Temperature Sensor.
• Make sure that the Outdoor Temperature Sensor is mounted
completely outside the house on the North, East or West
side of the house and out of direct sunlight. (Automatic
Mode Only)
• Make sure that the Outdoor Temperature Sensor is located
at least 3 feet away from all exhaust vents. (Automatic
Mode Only)
• If Outdoor Temperature Sensor is mounted in the fresh
air intake duct, make sure that the sensor is no more than
3 feet from the outside wall. (Automatic Mode Only)
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
• 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.
