ActronAir Reversing Valve Solenoid Coil R410A 7W 1m Cable switches the reversing valve between cooling and heating mode on compatible ActronAir R410A split ducted and wall split systems. A failed solenoid coil leaves the reversing valve stuck in cooling or heating mode -- switching mode at the wall controller produces no response. Isolate power and recover all refrigerant before replacing any refrigerant circuit valve components.