53 High Pressure Cutout Switch Off Error

Thermo King Alarm Code

Description	Corrective Action
High Pressure Cutout Switch Off Error (Check Alarm) Occurs during Pretrip (PTI) test only. Compressor does not stop during high pressure cutout switch test. Indicates: Faulty compressor contactor or control circuit Low refrigerant charge Defective high pressure cutout switch Strong winds causing cooling of condenser coil in low ambient conditions	Check discharge and suction pressure gauge readings and check refrigerant charge. Enter Manual Function Test menu. Start the following components together: compressor 100%, compressor and evaporator fans (high). Discharge pressure should increase and compressor should stop at 2250 kPa, 22.5 bar, 326 psig (high pressure cutout switch opens).