MCQUAY Service Guide Book
Diagnosis
57
Ceiling Convertible E Series Inverter-X Model
Model
Board Handset
MCMX 15/20/25E/ER
VA3.0
G17 / SLM3
COOL
(Green)
DRY
(Orange)
FAN
(Green)
HEAT
(Red)
Error
Code
(SLM3)
Operation / Faulty
Indication
Action
- Cooling
mode
-
- Dry
mode
-
- Fan
mode
-
- Heating
mode
-
- Defrost
mode
-
E1
Indoor temperature
sensor loose / short
Check indoor coil sensor
connection / change indoor
coil sensor
E2
Outdoor
temperature sensor
loose / short
Check outdoor coil sensor
connection / change outdoor
coil sensor
E3
Communication
error
Check connection wires
between indoor and outdoor
E4
Compressor
overload protection
If running ampere highly
increase, change the
compressor
E6
Compressor
overheat / gas leak
Check for leakage & repair /
Top up refrigerant
E7
IPM / PFC / Partial
switching
Check supply voltage and
compressor phase
E8
Outdoor over current
Check the input current and
discharge pressure
/
ON
ON or OFF
BLINKING
1 time
2 times
3 times
4 times
6 times
Содержание 5MDS
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