Troubleshooting guide

45
Ducted Blower B/D/ER Series Model – Multi Compressors
Rooftop Packaged Air Conditioner – Multi Compressors
Model Board Handset
SB 150B2/BR2 – 600B4/BR4 SQ2.0 SQ-LCD
SB 125D2 – 500D4 SQ2.0 SQ-LCD
SB 125ER2 – 600ER4 SQ2.0 SQ-LCD
RT 150 – 420A/AR SQ2.0 SQ-LCD
Error Code
When the system is on and an error occurs, the ON/OFF LED on the LCD panel will blink and an error
code is shown. When the system is off and there is a thermistor error, the ON/OFF LED is off but the error
code is still displayed. Each error code represents different message as below:
Error
Code
Faulty Indication
Error
Code
Faulty Indication
E01 Require manual reset (possible causes) E19 Indoor coil sensor 4 short
E02
Compressor 1 high temperature
(overload)
E20 Indoor coil sensor 1 open
E03
Compressor 2 high temperature
(overload)
E21 Indoor coil sensor 2 open
E04
Compressor 3 high temperature
(overload)
E22 Indoor coil sensor 3 open
E05
Compressor 4 high temperature
(overload)
E23 Indoor coil sensor 4 open
E06
Compressor 1 high pressure trip /
contact open
E24 Outdoor coil sensor 1 short
E07
Compressor 2 high pressure trip /
contact open
E25 Outdoor coil sensor 2 short
E08
Compressor 3 high pressure trip /
contact open
E26 Outdoor coil sensor 3 short
E09
Compressor 4 high pressure trip /
contact open
E27 Outdoor coil sensor 4 short
E10
Compressor 1 trip / low refrigerant /
outdoor abnormal
E28 Outdoor coil sensor 1 open
E11
Compressor 2 trip / low refrigerant /
outdoor abnormal
E29 Outdoor coil sensor 2 open
E12
Compressor 3 trip / low refrigerant /
outdoor abnormal
E30 Outdoor coil sensor 3 open
E13
Compressor 4 trip / low refrigerant /
outdoor abnormal
E31 Outdoor coil sensor 4 open
E14 Room sensor short E32 Compressor 1 de-ice
E15 Room sensor open E33 Compressor 2 de-ice
E16 Indoor coil sensor 1 short E34 Compressor 3 de-ice
E17 Indoor coil sensor 2 short E35 Compressor 4 de-ice
E18 Indoor coil sensor 3 short