Lennox Furnace Error Code E201: How to Fix It

Q: What causes Lennox furnace error code E201?

Error E201 is caused by a short circuit between the thermostat R (power) wire and ground. Common causes include damaged thermostat wiring, crossed wires at connections, moisture in wire junctions, or a faulty control board.

Q: Can I reset Lennox error code E201?

E201 cannot be simply reset - the underlying short circuit must be repaired first. The error will automatically clear once the electrical fault is fixed and power is restored to the system.

Q: Is it safe to run my furnace with E201 error?

No, never operate your furnace with error E201. This electrical short circuit can damage expensive components like the control board and poses potential fire hazards. Turn off the system immediately until repairs are completed.

Q: How much does it cost to fix Lennox E201 error?

Repair costs vary depending on the cause. Simple wire repairs may cost $150-300, while control board replacement can range from $400-800 including labor. Thermostat replacement typically costs $200-500.

Q: Can a bad thermostat cause E201 error?

Yes, a faulty thermostat with internal short circuits can trigger E201 error. However, damaged thermostat wiring between the wall and furnace is a more common cause than thermostat failure itself.

Abstract

Lennox furnace error code E201 indicates a low-voltage short circuit between the thermostat's R (power) terminal and ground. This serious electrical fault prevents your furnace from operating safely and requires immediate attention to avoid potential damage to the control board or thermostat.