McQuay Air Conditioner Error Codes DTCs

See also: McQuay Air Conditioner Service Manuals

For models: MDB 150/200/250 / 300/350/400/500 BR

E01 - manual restart required

E02 - increased temperature of compressor 1 (overload)

E03 - increased temperature of compressor 2 (overload)

E04 - increased temperature of compressor 3 (overload)

E05 - increased temperature of compressor 4 (overload)

E06 - activation of the compressor high pressure switch 1 / thermal contact operation

E07 - activation of the high pressure switch of compressor 2 / activation of thermal contact

E08 - activation of compressor high pressure switch 3 / activation of thermal contact

E09 - activation of compressor high pressure switch 4 / thermal contact operation

E10 - activation of compressor pressure switch 1 / refrigerant shortage / abnormal outdoor temperature

E11 - activation of compressor pressure switch 2 / refrigerant shortage / abnormal outdoor temperature

E12 - activation of compressor pressure switch 3 / refrigerant shortage / abnormal outdoor temperature

E13 - activation of compressor pressure switch 4 / refrigerant shortage / abnormal outdoor temperature

E14 - shorted room temperature sensor

E15 - open room temperature sensor

E16 - evaporator temperature sensor 1 shorted

E17 - evaporator temperature sensor 2 shorted

E18 - evaporator temperature sensor 3 shorted

E19 - evaporator temperature sensor 4 shorted

E20 - evaporator temperature sensor 1 open

E21 - evaporator temperature sensor 2 open

E22 - evaporator temperature sensor 3 open

E23 - evaporator temperature sensor 4 open

E24 - capacitor temperature sensor 1 shorted

E25 - capacitor temperature sensor 2 shorted

E26 - capacitor temperature sensor 3 shorted

E27 - shorted capacitor temperature sensor 4

E28 - Capacitor 1 temperature sensor open

E29 - open capacitor temperature sensor 2

E30 - capacitor temperature sensor 3 open

E31 - open capacitor temperature sensor 4

E32 - compressor defrost cycle 1 is activated

E33 - compressor 2 defrost cycle activated

E34 - compressor 3 defrost cycle activated

E35 - Compressor 4 defrost cycle activated

Full description of error codes in the McQuay service manual 

For models:

• MCK 20-50 A / AR
• MCM 20-50 D / DR
• MCC 10-60 C / CR

E1 - the room temperature sensor is closed or torn off

E2 - evaporator heat exchanger temperature sensor is closed or broken

E3 - closed or torn off the temperature sensor of the condenser heat exchanger

E4 - compressor overload

E5 - refrigerant (freon) leak

E6 - defective pump (pump)