High range clutch solenoid or its wiring failed open or shorted to ground
Aux 4th remote valve LEVER potentiometer is failed in the Armrest Controller
Cab sensor open or shorted to power
Engine Controller Failure - Hardware Failure
High range clutch solenoid or its wiring failed open or shorted to ground
Partial frosting and sweating of lines combined with poor cooling, fan belt slipping, loss of refrigerant, restricted or clogged liquid line or expansion valve malfunctioning.