Payne
Dehumidification Control Fault
Thermostat does not detect or control whole‑home dehumidifier or over‑cooling dehumidification feature.
Advertisements
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.
Advertisements
Possible Causes
Dehumidifier not wired to DEHUM or ACC terminals, Dehumidify feature disabled in thermostat settings, Incorrect dehumidification mode selected, Failed dehumidification relay on thermostat
How to Fix / Troubleshooting
Safety first: Turn off power to the HVAC system and dehumidifier before working on wiring.
- Check wiring: Confirm the dehumidifier control wires are connected to the correct DEHUM or accessory terminals on the thermostat or Payne control board.
- Enable feature: In the thermostat's advanced settings, enable dehumidification and set the desired humidity setpoint.
- Select correct mode: Choose whether the system should use dedicated dehumidifier equipment or over‑cooling with the AC to dehumidify.
- Test call for dehumidification: Raise the humidity setpoint to force a call and verify that the dehumidifier or AC responds.
- Replace thermostat if no output: If wiring and configuration are correct but no control signal is sent, the thermostat's dehumidification output may be defective and the thermostat should be replaced.
Advertisements
Repair Difficulty
Medium
3/5
Required Part
Payne Smart Thermostat Dehumidification Output
Check Price on Amazon
We may earn a commission from links on this page.
Advertisements