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MCQUAY Service Guide Book
Ceiling Convertible E Series Inverter-X Model
Model
MCMX 15/20/25E/ER
COOL
DRY
(Green)
(Orange)
(Green)
1 time
2 times
3 times
4 times
6 times
ON
/
Board
VA3.0
FAN
HEAT
Error
Code
(SLM3)
(Red)
E1
E2
E3
E4
E6
E7
E8
ON or OFF
Handset
G17 / SLM3
Operation / Faulty
Indication
-
Cooling mode
-
Dry mode
-
Fan mode
-
Heating mode
-
Defrost mode
Indoor temperature
sensor loose / short
Outdoor
temperature sensor
loose / short
Communication
error
Compressor
overload protection
Compressor
overheat / gas leak
IPM / PFC / Partial
switching
Outdoor over current
BLINKING
57
Action
-
-
-
-
-
Check indoor coil sensor
connection / change indoor
coil sensor
Check outdoor coil sensor
connection / change outdoor
coil sensor
Check 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
Diagnosis
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