Resideo Humidity Control Misconfiguration or Sensor Error

Thermostat does not control humidity as expected (too humid or too dry)

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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

Incorrect humidity setpoints, Disabled dehumidification/humidification features, Faulty internal humidity sensor, Miswired humidifier/dehumidifier terminals

How to Fix / Troubleshooting

Safety first: Turn off power to HVAC equipment before adjusting any accessory wiring.

Steps to troubleshoot:

  • 1. Verify humidity settings: On the thermostat, check that humidity control is enabled and setpoints are reasonable (e.g., 40–50% RH).
  • 2. Compare humidity readings: Use a separate hygrometer to compare with the thermostat's humidity reading. Adjust calibration if available.
  • 3. Check accessory wiring: Ensure humidifier and dehumidifier wires are connected to the correct terminals (HUM, DHUM, etc.) per the Resideo wiring diagram.
  • 4. Confirm equipment operation: Manually call for humidification or dehumidification and verify that the connected equipment runs.

When to call a professional: If humidity equipment does not respond or readings are far off, a technician should inspect sensors and accessory wiring.

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Repair Difficulty

Medium 3/5

Required Part

Thermostat Humidity Sensor or Humidifier/Dehumidifier Control Circuit
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