McQuay MWM Service Manual page 62

MCQUAY Service Guide Book
Multi Split Inverter – Y Outdoor Unit
Model
M5MSY 20/25/30 BR
The outdoor unit LED indicates the running condition of the system:
LED INDICATION
Green Red
A 1 2 3
● ● ●
● ● ●
● ● ○
● ● ○
● ○ ●
● ○ ○
● ○ ○
○ ● ●
○ ● ●
○ ● ○
○ ● ○
○ ● ○
○ ○ ●
○ ○ ●
○ ○ ○
○ ○ ○
Blinks
●
Off
○
On
Board
-
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
○
Description
61
Diagnosis