McQuay MDS Series User Manual

68 Service Manual SM-MDS_(ii)
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
76
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
E0
Discharge temperature
sensor malfunction
 Outdoor discharge temperature sensor broken or loose
73
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
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
6

McQuay MDS Series Specifications

General

Brand	McQuay
Model	MDS Series
Category	Compressor
Language	English