McQuay MWM09J Manual page 68

MWM-J_(ii)
LED Indoor Lights: Normal Operation and Fault Conditions for Cooling / Heat Pump Unit

1
COOL/HEAT
(GREEN/RED)
Green
Red
Red
Green
1 time
3 times
2 times
1 time
Red
3 times
6 times
4 times
5 times
ON
Note: The unit will not detect sensor missing when the compressor is ON.
Error Normal Operation / Fault Indi-
Code cation
- Cool mode
- Heat mode
- Auto mode in Heating operation
- Auto mode in Cooling operation
- Time on
- Sleep mode on
- Fan mode on
- Dry mode on
Room air sensor contact loose
Blink E1
/ short
Blink E3 Outdoor coil sensor open
Blink E2 Indoor coil sensor open
Compressor overload / indoor
Blink E4 coil sensor short /
outdoor coil sensor short
- Defrost operation
Blink E5 Gas leak
Hardware error (tact switch pin
Blink E8
short)
Blink E9 No feedback from indoor fan
Blink
EEPROM defrost
EE
ON or OFF
Action
-
-
-
-
-
-
-
-
Check room sensor connection /
change room air sensor
Check outdoor coil sensor
connection / change outdoor coil
sensor
Check indoor coil sensor
connection / change indoor coil
sensor
If running ampere highly increase,
change the compressor. If not,
replace the coil sensor.
-
Top up refrigerant / check for
leakage
Contact your distributor
Contact your distributor
Contact your distributor
Blinking
Troubleshooting
66