iComfort
Humidifier Control Failure
Thermostat does not detect or control whole‑home humidifier
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Safety Warning
This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.
If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.
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Possible Causes
Humidifier not wired to correct iComfort terminals, Humidifier power not present, Incorrect humidifier type selected in setup, Failed humidifier output relay on thermostat/interface
How to Fix / Troubleshooting
Safety first: Turn off power to the furnace/air handler and humidifier before working on wiring.
- Step 1 – Verify configuration: In installer setup, ensure that a humidifier is enabled and the correct type (powered/bypass) is selected.
- Step 2 – Inspect wiring: Confirm that the humidifier control wires are connected to the designated humidifier terminals on the thermostat or equipment interface module.
- Step 3 – Check humidifier power: Verify that the humidifier has its required power source (24V or 120V) and that any inline switches are on.
- Step 4 – Test output: Command humidity from the thermostat and use a multimeter to check for control voltage at the humidifier terminals.
- Step 5 – Replace control module: If the thermostat does not provide output despite correct configuration, the humidifier relay or output driver may be defective and the thermostat or interface module should be replaced.
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Repair Difficulty
Medium
3/5
Required Part
iComfort Humidifier Control Output (Thermostat/Interface)
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