
McQuay Service Guide Book
74
Multi Split Inverter – Y Outdoor Unit
Model Board Handset
5MSY 025/030 BR
G17
Error code diagnosis by Outdoor 7-segment Display
The outdoor unit LED indicates the running condition of the system:
LED INDICATION
Green Red
A 1 2 3 4
Description
NORMAL
INSTALLATION ERROR
ANTIFREEZE (OTHER ROOMS)
HEAT SINK OVERHEAT
IPM ERROR / IGBT ERROR
INSUFFICIENT GAS
AC INPUT OVER CURRENT
COMPRESSOR START-UP ERROR
COMMUNICATION ERROR (OUTDOOR CONTROL PCB AND IPM
PCB)
4 WAY VALVE ERROR
DC VOLTAGE OUT OF RANGE
COMPRESSOR MOTOR LOCK / COMPRESSOR OVERLOADED
DISCHARGE PIPE OVERHEAT
ANTIFREEZE (COOLING) / HEAT EXCHANGER OVERHEAT
(HEATING)
HEAT EXCHANGER OVERHEAT
COMPRESSOR SENSOR SYSTEM ERROR
COMPRESSOR FEEDBACK DETECTION ERROR
AC CURRENT SENSOR ERROR
OUTDOOR AIR THERMISTOR SHORT/OPEN
COMPRESSOR DISCHARGE PIPE THERMISTOR SHORT / OPEN /
MISPLACED
OUTDOOR HEAT EXCHANGER THERMISTOR SHORT/ OPEN
LIQUID PIPE THERMISTOR SHORT/ OPEN
GAS PIPE THERMISTOR SHORT/OPEN
HEAT SINK THERMISTOR SHORT / OPEN
OUTDOOR CONTROL BOX OVERHEAT
OUTDOOR PCB ERROR
OUTDOOR DC FAN MOTOR LOCK
Blinks
Off
On
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