MrCool DIY-MULTI4-36HP230C User Manual

 Troubleshooting 23 
2.Field Maintenance
Possible causes of trouble
Power failure
Blown fuse or varistor
Loose connections
Shorted or broken wires
Safety device opens
Faulty thermostat / room temperature sensor
Wrong setting place of temperature sensor
Faulty transformer
Shorted or open capacitor
Faulty magnetic contactor for compressor
Faulty magnetic contactor for fan
Low voltage
Faulty stepping motor
Shorted or grounded compressor
Shorted or grounded fan motor
Unit will not start ☆ ☆ ☆ ☆ ☆ ☆
Compressor will not start but fans run ☆ ☆ ☆ ☆ ☆
Compressor and condenser (outdoor) fan will not start ☆ ☆ ☆
Evaporator (indoor) fan will not start ☆ ☆ ☆ ☆
Condenser (Outdoor) fan will not start ☆ ☆ ☆ ☆ ☆
Unit runs, but shortly stops ☆ ☆
Compressor short-cycles due to overload ☆ ☆
High discharge pressure
Low discharge pressure
High suction pressure
Low suction pressure
Unit runs continuously but insufficient cooling
Too cool ☆ ☆
Compressor is noisy
Horizontal louver can not revolve ☆ ☆ ☆
Test method / remedy
Test voltage
Inspect fuse type & size
Inspect connections - tighten
Test circuits with tester
Test continuity of safety device
Test continuity of thermostat / sensor & wiring
Place the temperature sensor at the central of the air inlet grille
Check control circuit with tester
Check capacitor with tester
Test continuity of coil & contacts
Test continuity of coil & contacts
Test voltage
Replace the stepping motor
Check resistance with multimeter
Check resistance with multimeter
Electrical Circuit

MrCool DIY-MULTI4-36HP230C Specifications

General

Brand	MrCool
Model	DIY-MULTI4-36HP230C
Category	Air Conditioner
Language	English