Lennox HVAC Error Code E18: How to Fix It

Q: What causes Lennox error code E18?

Error E18 is triggered when the outdoor fan motor's RPM is outside the normal range, often due to a faulty motor, bad capacitor, blocked fan, or electrical issue.

Q: Can I reset Lennox error code E18?

Sometimes turning off the system at the thermostat and disconnecting power for 5 minutes can clear the error if it was a temporary glitch. If the underlying issue remains, the error will return.

Q: How much does it cost to fix Lennox error E18?

DIY repair costs range from $10 for a capacitor to $150 for a fan motor. Professional service typically costs $150-$400 depending on the cause and labor.

Q: Is it safe to run my HVAC with error code E18?

No, operating the system with an E18 error may cause further damage to the compressor or other components. It's best to shut down the unit and address the issue promptly.

Q: What is the lifespan of a Lennox outdoor fan motor?

With proper maintenance, fan motors typically last 10-15 years. Factors like dust, electrical surges, and lack of lubrication can shorten lifespan.

Abstract

Lennox error code E18 indicates a problem with the outdoor fan motor's RPM (revolutions per minute). This usually means the fan motor is not running at the correct speed or has stopped entirely, which can cause the system to shut down to prevent damage.