McQuay MRT - Page 46

MCQUAY Service Guide Book Diagnosis
45
Wall Mounted J Series
Model Board Handset
MWM 09/15J/JR L2GSN G17
SLEEP
(Red)
POWER
(Green/Red)
TIMER
(Orange)
Error
Code
Operation / Faulty
Indication
Action
- Cooling mode -
- Heating mode -
-
Auto mode in heating
operation
-
-
Auto mode in cooling
operation
-
- Timer On -
- Sleep mode On -
- Fan mode On -
- Dry mode On -
E1
Room air sensor contact
loose / short
Check room sensor
connection / change room
sensor
E2
Indoor coil sensor
contact open
Check indoor coil sensor
connection / change indoor
coil sensor
E3
Outdoor coil sensor
contact open
Check outdoor coil sensor
connection / change outdoor
coil sensor
E4
Compressor overload /
Indoor coil sensor short /
Outdoor coil sensor
short
If running ampere highly
increase, change the
compressor. If not, replace
the coil sensor
- Defrost operation -
E5 Gas leak
Check for leakage & repair /
Top up refrigerant
E8
Hardware error (tact
switch pin short)
Check for the tact switch pin
condition
E9
No Feedback from
indoor fan
Check indoor fan motor / fan
motor wiring
EE EEPROM defrost -
Note: The unit will not detect sensor missing when the compressor is ON.
/
ON ON/ OFF Blinking
/
/
/
/
Green
Red
Red
Green
1 time
3 times
1 time
Red
3 times
2 times
6 times
4 times
5 times