Low pressure switch open for cumulative 60 seconds (no consecutive requirement)
Decelerator (STD cab) Position potentiometer voltage is too low
Master clutch is not calibrated
Aux 3rd Raise solenoid failed open or short circuit.
Low pressure switch open for > 1 minute
Master clutch is not calibrated
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.