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MCQUAY Service Guide Book
Ceiling Cassette A/C Series Inverter-X Model
Model
MCKX 20/25A/AR
MCKX 10/15/20C/CR
POWER
TIMER
SLEEP
(Green)
(Orange)
1 time
2 times
3 times
4 times
5 times
6 times
ON
/
Board
VA3.0
VA3.0
HEAT
Error
Code
(SLM3)
(Red)
(Red)
-
-
-
-
-
E1
E2
E3
E4
E5
E6
E7
E8
ON or OFF
Handset
G17 / SLM3
G17 / SLM3
Operation / Faulty
Indication
Cooling mode
Timer On
Sleep mode On
Heating mode
Defrost mode
Indoor temperature
sensor loose / short
Outdoor temperature
sensor loose / short
Communication error
Compressor overload
protection
Pump fault
Compressor overheat /
gas leak
IPM / PFC / Partial
switching
Outdoor over current
BLINKING
56
Diagnosis
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
Clear the clogging at drain
pipe. If pump is not
working, change the pump
Check for leakage & repair
/ Top up refrigerant
Check supply voltage and
compressor phase
Check the input current
and discharge pressure
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