Lennox
Zoning Control Misoperation
Thermostat fails to control zoning properly; some zones do not heat/cool as commanded.
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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 zone configuration in Lennox thermostat, Miswired zone dampers to Lennox zone panel, Failed damper actuator, Faulty Lennox zone control board
How to Fix / Troubleshooting
Safety warning: Turn off power to the HVAC and zone panel before working on dampers or wiring.
- 1. Verify zone setup:
- Check the thermostat's zone configuration and ensure each zone is correctly named and assigned.
- 2. Inspect damper wiring:
- At the Lennox zone panel, confirm each damper is wired to the correct zone terminals.
- 3. Observe damper operation:
- Command each zone ON/OFF and listen or feel for damper movement in the ductwork.
- 4. Replace failed dampers or zone board as needed:
- If a damper does not move when powered, replace the actuator; if multiple zones misbehave, suspect the zone control board.
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Repair Difficulty
Hard
4/5
Required Part
Lennox Zone Damper Actuator
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