Lennox HVAC Error Code E45: How to Fix It

Q: What does Error Code E45 mean on a Lennox HVAC system?

Error code E45 indicates that the compressor's Locked Rotor Amps (LRA) have been exceeded, meaning the compressor is drawing too much current. This often points to a locked rotor, a failing compressor, or electrical issues.

Q: Can I reset the Lennox E45 error code myself?

Yes, you can clear the code by turning off power to the unit for 5-10 minutes and then restoring power. However, if the underlying problem isn't fixed, the code will return.

Q: What causes a high LRA reading on a Lennox compressor?

Common causes include a faulty run capacitor, dirty condenser coils, low line voltage, a failing contactor, or a compressor with internal mechanical or electrical problems.

Q: How much does it cost to fix Lennox error code E45?

Costs vary: a capacitor replacement is $20-$50 for parts plus labor; compressor replacement can be $1,500-$3,000. If the compressor is under warranty, labor may still be costly.

Q: Is it safe to run my Lennox AC with error code E45?

No. Continuing to run the system can damage the compressor further or cause electrical hazards. You should turn off the system and troubleshoot or call a pro.

Abstract

Lennox error code E45 means your HVAC system's compressor is drawing more current than its Locked Rotor Amps (LRA) rating. This typically indicates a locked rotor or a failing compressor, often due to electrical issues or mechanical failure. Follow these steps to diagnose and resolve the problem safely.