Thermostat does not detect or control whole‑home dehumidifier

Safety first: Turn off power to the HVAC system and dehumidifier before working on wiring.

• Step 1 – Confirm configuration: In installer setup, verify that a dehumidifier is enabled and the correct control method is selected.
• Step 2 – Inspect wiring: Ensure the dehumidifier control wires are on the correct iComfort dehumidifier terminals and that polarity is correct if required.
• Step 3 – Verify dehumidifier operation: Manually start the dehumidifier using its onboard controls (if available) to confirm it works independently.
• Step 4 – Test control signal: Command dehumidification from the thermostat and measure for control voltage at the dehumidifier terminals.
• Step 5 – Replace thermostat/interface: If no control signal is present despite correct setup, the dehumidifier output circuit may be defective and the thermostat or interface module should be replaced.