McQuay MWM Service Manual page 71

MCQUAY Service Guide Book
Error Codes for G17 and GS01 – Inverter Y Models
Error
Error Description
Codes
Normal
00
Insufficient gas
U0
DC voltage out of range
U2
Communication error
U4
Signal transmission error (on outdoor
U7
unit PCB)
Installation error
UA
Communication Error (indoor and
UF
outdoor) piping and wiring
Anti-freeze function in other room
UH
Indoor PCB error
A1
Water pump error
A3
Antifreeze
A5
Indoor fan motor abnormal
A6
Indoor heat exchanger thermistor short/
C4
open
Indoor room thermistor short/ open
C9
Outdoor PCB error
E1
High pressure protection
E3
Low pressure protection
E4
Compressor motor lock
E5
Compressor start-up error
E6
Outdoor DC fan motor lock
E7
Ac input over current
E8
EXV error
E9
4-way valve error
EA
Error
Codes
Discharge pipe overheat
F3
Heat exchanger overheat
F6
Compressor sensor system abnormality
H0
High pressure switch error
H3
Position sensor abnormality
H6
AC current sensor error
H8
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
J6
Subcooling heat exchanger thermistor
J7
short/ open
Liquid pipe thermistor short/ open
J8
Gas pipe thermistor abnormality
J9
Communication error (control PCB and
LC
inverter PCB)
Outdoor PCB error
L1
Electrical box temperature rise
L3
Heat sink overheat
L4
IPM error / IGBT error
L5
Stall prevention
L9
Open phase or voltage unbalance
P1
Heat sink thermistor short / open
P4
Capacity setting error
PJ
70
Error Description
Diagnosis