McQuay MRT - Page 71

MCQUAY Service Guide Book Diagnosis
70
Error Codes for G17 and GS01 – Inverter Y Models
Error
Codes
Error Description
Error
Codes
Error Description
00 Normal F3 Discharge pipe overheat
U0 Insufficient gas
F6
Heat exchanger overheat
U2 DC voltage out of range H0 Compressor sensor system abnormality
U4 Communication error H3 High pressure switch error
U7
Signal transmission error (on outdoor
unit PCB)
H6 Position sensor abnormality
UA Installation error H8 AC current sensor error
UF
Communication Error (indoor and
outdoor) piping and wiring
H9 Outdoor air thermistor short / open
UH Anti-freeze function in other room J1 Pressure sensor error
A1 Indoor PCB error J3
Compressor discharge pipe thermistor
short /open / misplaced
A3 Water pump error J5 Suction pipe thermistor short/ open
A5 Antifreeze J6 Outdoor heat exchanger
A6 Indoor fan motor abnormal J7
Subcooling heat exchanger thermistor
short/ open
C4
Indoor heat exchanger thermistor short/
open
J8 Liquid pipe thermistor short/ open
C9 Indoor room thermistor short/ open J9 Gas pipe thermistor abnormality
E1
Outdoor PCB error LC
Communication error (control PCB and
inverter PCB)
E3
High pressure protection
L1
Outdoor PCB error
E4
Low pressure protection
L3
Electrical box temperature rise
E5
Compressor motor lock
L4
Heat sink overheat
E6
Compressor start-up error
L5
IPM error / IGBT error
E7
Outdoor DC fan motor lock
L9
Stall prevention
E8
Ac input over current
P1
Open phase or voltage unbalance
E9
EXV error
P4
Heat sink thermistor short / open
EA
4-way valve error
PJ
Capacity setting error