Service manual

68 Service Manual SM-MDS_(i)
6.4 Outdoor Error Code for MDOM PCB
Error
Code
Description Possible Causes Page
C- Communication failure
between outdoor and all
indoor
• Indoor and outdoor communication wire broken
• Indoor and outdoor communication wire loose
• Indoor and outdoor communication wire A and B reversed
• Communication wire too long, should less than 1000m
• Outdoor PCB not power on
• Indoor and outdoor jump wire not correct, still on update status
• Last indoor unit terminal resistance of communication wire not short-circuit
• Indoor and outdoor PCB program not compatible
• Indoor and outdoor PCB abnormal
CX “X” indoor no. Particular
indoor no
communication
• Indoor “X” and outdoor communication wire broken
• Indoor “X” and outdoor communication wire loose
• Indoor “X” and outdoor communication wire A B reverse
• Indoor “X” and outdoor jump wire not correct, still on update status
• Indoor “X” and outdoor PCB program not compatible
• Indoor “X” and outdoor PCB abnormal
76
E0 Discharge temperature
sensor malfunction
• Outdoor discharge temperature sensor broken or loose
E1 Outdoor ambient
temperature sensor
malfunction
• Outdoor ambient temperature sensor broken or loose
E2 Suction temperature
sensor malfunction
• Suction temperature sensor broken or loose
E3 Compressor base
temperature sensor
malfunction
• Compressor base temperature sensor broken or loose
E4 Coil inlet temperature
sensor malfunction
• Coil inlet temperature sensor broken or loose
E5 Coil midlet temperature
sensor malfunction
• Coil midlet temperature sensor broken or loose
E6 Coil outlet temperature
sensor malfunction
• Coil outlet temperature sensor broken or loose
73
E7 Compressor discharge
temperature too high
(>130ºC)
• Outdoor motor broken (cooling)
• Outdoor circulation air short-circuit (cooling)
• Outdoor heat exchanger too dirty (cooling)
• Outdoor EXV not on properly (heating)
• Indoor EXV not on properly (heating)
• Refrigerant leakage or insufficient
• Outdoor service valve/ball valve not open
78
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