Lennox Furnace Error Code E202: How to Fix It

Q: What causes Lennox error code E202?

Error code E202 is caused by a short circuit in the thermostat G wire circuit, often due to damaged wiring, loose connections, pinched wires, or a faulty control board.

Q: Can I reset Lennox error code E202?

You can try resetting by turning off power for 5 minutes and restarting, but E202 typically requires fixing the underlying wiring issue before the error will clear permanently.

Q: Is error code E202 dangerous?

Yes, E202 indicates an electrical short circuit which can damage the control board and create safety hazards. The furnace should not be operated until the issue is resolved.

Q: How much does it cost to fix Lennox error E202?

Repair costs range from $100-200 for simple wiring repairs to $300-600 if the control board needs replacement, depending on your location and service provider.

Abstract

Lennox furnace error code E202 indicates a short circuit in the low-voltage thermostat (G) circuit, which controls the blower fan. This serious electrical issue can prevent your furnace from operating properly and requires immediate attention to avoid damage to the control board.