McQuay MWM Service Manual page 64

MCQUAY Service Guide Book
Netware 3C / SLM 9 – Inverter Y Models (Except
5WMY-J/JR)
Error
Faulty Indication
Code
Normal
00
Indoor PCB error
A1
Drain pump fault
A3
Antifreeze(Cooling) / Heat exchanger
A5
overheat(Heating)
Indoor fan motor fault
A6
Electrical air cleaner fault
AH
Indoor heat exchanger (1) thermistor
C4
short/open
Indoor heat exchanger (2) thermistor
C5
short/open
Louver limit switch error
C7
Indoor room thermistor short/open
C9
Outdoor PCB error
E1
High pressure protection
E3
Low pressure protection
E4
Compressor motor lock/compressor
E5
overloaded
Compressor start-up error
E6
Outdoor DC fan motor lock
E7
Ac input over current
E8
EXV error
E9
4 way valve error
EA
Discharge pipe overheat
F3
Heat exchanger overheat
F6
Compressor sensor system error
HO
High pressure switch error
H3
Compressor feedback detection error
H6
Fan motor overloaded/over current/sensor
H7
fault
AC current sensor error
H8
Error
Faulty Indication
Code
Outdoor air thermistor short/open
H9
Pressure sensor error
J1
Compressor discharge pipe thermistor
J3
short/open/misplaced
Suction pipe thermistor short/open
J5
Outdoor heat exchanger thermistor
J6
short/open
Sub cooling heat exchanger thermistor
J7
short/open
Liquid pipe thermistor short/open
J8
Gas pipe thermistor short/open
J9
Inverter outdoor PCB error
L1
Outdoor control box overheat
L3
Heat sink overheat
L4
IPM error/IGBT error
L5
Electrical thermal switch
L8
Stall prevention
L9
Communication error (outdoor PCB &
LC
inverter PCB)
Open phase or voltage unbalance
P1
Heat sink thermistor short/open
P4
Capacity setting error
PJ
Insufficient gas
U0
DC voltage out of range
U2
Communication error
U4
Communication error (outdoor PCB & IPM
U7
PCB)
Installation error
UA
Piping & wiring installation mismatch/wrong
UF
wiring/insufficient gas
Anti freeze (other rooms)
UH
63
Diagnosis