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MCQUAY Service Guide Book
Wall Mounted G Series Inverter-X Model
Model
MWMX 10/15/20/25G/GR
SLEEP
POWER
(Red)
(Orange)
(Green/Red)
/
/
/
Red
Green
Green
Green
Green
ON
/
Board
VA2.0
TIMER
IONIZER
(SLM3)
(Green)
/
/
/
/
/
ON or OFF
Handset
G17 / SLM3
Error
Operation / Faulty
Code
Indication
-
Cooling mode
Heating mode / Standby
-
mode (only for heat
pump model)
-
Auto mode in operation
-
Timer On
-
Sleep mode On
-
Ionizer On
-
Fan mode On
-
Dry mode On
-
Defrost mode
Indoor temperature
E1
sensor loose / short
Coil temperature sensor
-
loose / short
Outdoor temperature
E2
sensor loose / short
Communication error
E3
between indoor and
outdoor
Compressor overload
E4
protection
Compressor overheat /
E6
gas leak
E7
IPM / PFC error
Outdoor total current trip
E8
/ DC peak
Indoor fan feedback
E9
error
BLINKING
55
Diagnosis
Action
-
-
-
-
-
-
-
-
-
Check indoor coil sensor
connection / change
indoor coil sensor
Check coil sensor
connection / change coil
sensor
Check outdoor coil
sensor connection /
change outdoor coil
sensor
Check the connection
wires between indoor
and outdoor
If running ampere highly
increase, change the
compressor
Check for leakage &
repair / Top up
refrigerant
Check supply voltage
and compressor phase
Check the input current
and discharge pressure
Check indoor fan motor /
fan motor wiring
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