Lennox HVAC Error Code E15: How to Fix It

Q: What does error code E15 mean on a Lennox HVAC system?

Error code E15 indicates the inverter drive has exceeded its maximum safe temperature. This can be due to poor airflow, dirty coils, a faulty condenser fan motor, or a defective inverter.

Q: Can I reset the E15 error code myself?

Yes, you can reset the error by turning off power to the unit at the breaker for at least 30 minutes. If the underlying issue is not resolved, the error will return.

Q: How do I clean the condenser coils?

Turn off power, remove debris, and spray a gentle stream of water from the inside out. Use a commercial coil cleaner for heavy buildup. Avoid high pressure that can damage fins.

Q: How much does it cost to fix a Lennox E15 error?

If it's just a dirty coil or filter replacement, the cost is minimal (coil cleaner, filters). If the inverter needs replacement, parts and labor can range from $500 to $1,500+.

Q: What tools do I need to diagnose Lennox error E15?

You'll need a multimeter to test the fan motor and inverter, a garden hose to clean coils, and basic hand tools to access components.

Abstract

Lennox error code E15 indicates that the inverter drive on your HVAC system has exceeded its safe operating temperature. This can be caused by poor airflow, a faulty inverter, or a failing condenser fan motor. Follow the steps below to diagnose and fix the problem.