McQuay M4MC - 7.2 Error Codes Diagnosis By Handset

MCQUAY Service Guide Book Diagnosis
61
Multi Split Inverter – Y Outdoor Unit
Model Board
M5MSY 20/25/30 BR -
The outdoor unit LED indicates the running condition of the system:
LED INDICATION
Description
Green Red
A 1 2 3 4
● ● ● ●
NORMAL
INSTALLATION ERROR
ANTIFREEZE (OTHER ROOMS)
● ● ● ○
HEAT SINK OVERHEAT
● ● ○ ●
IPM ERROR / IGBT ERROR
● ● ○ ○
INSUFFICIENT GAS
● ○ ● ○
AC INPUT OVER CURRENT
● ○ ○ ●
COMPRESSOR STMRT-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