McQuay MWM - Water Source Split Diagnosis: Ceiling Cassette A;B;C Series

MCQUAY Service Guide Book Diagnosis
52
Water Source Split Unit – Ceiling Cassette A / B / C
Series Model
Model Board Handset
M5CKWS 20/25/30/40/50AR LWS2.0 G17 / SLM3 / Netware 3 / SLM8
M5CKWS 10/15/20CR LWS2.0 G17 / SLM3 / Netware 3 / SLM8
POWER
(Green)
TIMER
(Orange)
HEAT
(Red)
Error Code
(SLM3 /
Netware 3)
Operation / Faulty
Indication
Action
- Cooling mode -
- Timer On -
- Heating mode -
-
Auto mode in cooling
operation
-
-
Auto mode in heating
operation
-
E1
Room air sensor
contact loose / short
Check room sensor connection
/ change room sensor
E2
Indoor coil sensor
contact loose / open
Check indoor coil sensor
connection / change indoor coil
sensor
E3
Outdoor coil sensor
contact loose / open
Check outdoor coil sensor
connection / change outdoor
coil sensor
E4
Compressor overload
protection
If running ampere highly
increase, change the
compressor
E6 Pump fault
Clear the clogging at drain
pipe. If pump is not working,
change the pump
E5 Gas leak
Check for leakage & repair /
Top up refrigerant
/
ON ON or OFF BLINKING
1 time
2 times
3 times
1 time
2 times
3 times