Ecobee Thermostat Reversing Valve Fault: How to Fix It

Q: What does the reversing valve fault mean on my Ecobee?

The reversing valve fault indicates that your Ecobee thermostat's O/B wire configuration doesn't match your heat pump's actual reversing valve operation, preventing proper switching between heating and cooling modes.

Q: How do I know if my heat pump uses O or B wire configuration?

Most heat pumps use O wire configuration (valve energized for cooling), but some brands like Rheem, Ruud, and older systems may use B configuration (valve energized for heating). Try toggling the setting if you're experiencing the fault.

Q: Will changing the O/B setting damage my heat pump?

No, changing the O/B setting in your Ecobee will not damage your heat pump. This setting only changes when the thermostat sends power to the reversing valve and is safe to adjust.

Q: Why does my Ecobee show reversing valve fault after installation?

This error typically appears when the installer hasn't configured the O/B wire setting to match your specific heat pump model during initial setup. It's a common configuration oversight that's easily corrected.

Q: Can I fix the reversing valve fault myself?

Yes, the reversing valve fault is usually fixed by simply toggling the O/B wire setting in your Ecobee's equipment configuration menu. No technical skills or tools are required for this software adjustment.

Abstract

The Ecobee reversing valve fault occurs when your thermostat's O/B wire orientation is incorrectly configured for your heat pump system. This error prevents proper switching between heating and cooling modes, but can typically be resolved by adjusting a simple setting in your thermostat's equipment configuration.