Download McQuay MWSS Troubleshooting guide

MCQUAY Service Guide Book
Diagnosis
Wall Mounted G Series Inverter-X Model
Model
MWMX 10/15/20/25G/GR
SLEEP
Board
VA2.0
POWER
TIMER
(Green/Red)
(Orange)
Handset
G17 / SLM3
IONIZER
(Green)
Error
Code
(SLM3)
/
/
-
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
-
(Red)
Red
E1
Green
Green
E2
Outdoor temperature
sensor loose / short
E3
Communication error
between indoor and
outdoor
E4
Compressor overload
protection
E6
Compressor overheat /
gas leak
E7
IPM / PFC error
E8
E9
Green
ON
/
ON or OFF
Indoor temperature
sensor loose / short
Coil temperature sensor
loose / short
-
Green
Operation / Faulty
Indication
Outdoor total current trip
/ DC peak
Indoor fan feedback
error
BLINKING
55
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