Lennox HVAC Error Code E20: How to Fix It

Q: What does Lennox error code E20 mean?

E20 indicates a reversing valve fault, meaning the heat pump's reversing valve is not operating correctly, preventing the system from switching between heating and cooling.

Q: Can I still use my HVAC with error code E20?

You may still get heat or cool if the valve is stuck in one position, but you won't be able to switch modes. It's best to fix the issue to avoid strain on the system.

Q: How much does it cost to fix a Lennox reversing valve fault?

DIY coil replacement costs $20-$50 for the part. Professional repair, including valve replacement, can range from $500 to $1,500 depending on labor and refrigerant.

Q: Can a reversing valve get stuck?

Yes, debris or lack of use can cause the valve spool to stick. Tapping or cycling the system may free it, but sometimes replacement is necessary.

Q: Is error code E20 covered under warranty?

If your Lennox system is under warranty, the reversing valve coil or valve may be covered. Check your warranty terms or contact Lennox support.

Abstract

Error code E20 on your Lennox HVAC system indicates a reversing valve fault. This usually means the reversing valve is stuck in one position or has failed electrically, preventing your heat pump from switching between heating and cooling modes. This guide will help you diagnose and potentially fix the issue.