E441
Lennox
Outdoor Unit Configuration Fault
Lennox thermostat shows E441 outdoor unit configuration error; outdoor unit may not respond correctly to staging commands.
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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 outdoor unit size or type selected, Mis-set dip switches on outdoor control, Replaced board not programmed, Communication mismatch
How to Fix / Troubleshooting
Safety: Turn off power to the outdoor unit before adjusting dip switches or accessing the control board.
- 1. Confirm outdoor model selection: In the thermostat installer setup, verify the correct Lennox condenser model and capacity are selected.
- 2. Check outdoor dip switches: On the outdoor control board, verify staging, capacity, and other configuration switches match the installation manual.
- 3. Reinitialize communication: Power down both indoor and outdoor units, then power up indoor first, then outdoor, then thermostat to allow re-synchronization.
- 4. Verify board part number: Ensure any replacement outdoor control board is the correct Lennox part for your model.
When to call a pro: If configuration options are unclear or undocumented, a Lennox dealer should perform commissioning.
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Repair Difficulty
Medium
3/5
Required Part
Lennox Outdoor Control Board
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