Outdoor Error Code For Mdom Pcb - McQuay MDS Series Service Manual

6.4 Outdoor Error Code for MDOM PCB

Error
Description
Code
C- Communication failure
between outdoor and all
indoor
"X" indoor no. Particular
CX
indoor no
communication
6
E0 Discharge temperature
sensor malfunction
E1 Outdoor ambient
temperature sensor
malfunction
E2 Suction temperature
sensor malfunction
E3 Compressor base
temperature sensor
malfunction
E4 Coil inlet temperature
sensor malfunction
E5 Coil midlet temperature
sensor malfunction
E6 Coil outlet temperature
sensor malfunction
E7 Compressor discharge
temperature too high
(>130º C)
68

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

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

Outdoor discharge temperature sensor broken or loose

Outdoor ambient temperature sensor broken or loose

Suction temperature sensor broken or loose

Compressor base temperature sensor broken or loose

Coil inlet temperature sensor broken or loose

Coil midlet temperature sensor broken or loose

Coil outlet temperature sensor broken or loose

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
Possible Causes Page
76
73
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Service Manual SM-MDS_(ii)