Reversing Valve

The reversing valve is what allows a heat pump to switch between heating and cooling mode. It redirects the flow of refrigerant so the system can either absorb heat from outside (heating) or dump heat outside (cooling). When a reversing valve fails, your system might blow room-temperature air, get stuck in one mode, or not respond to mode changes on the remote. It's a repair that requires a licensed technician — not something to troubleshoot yourself. If your mini split is cooling fine but won't heat (or vice versa), the reversing valve is one of the first things a tech will check.