McQuay MWM Service Manual page 53

MCQUAY Service Guide Book
Water Source Split Unit – Ceiling Cassette A / B / C
Series Model
Model
M5CKWS 20/25/30/40/50AR
M5CKWS 10/15/20CR
POWER TIMER
(Green) (Orange)
1 time
2 times
3 times
1 time
2 times
3 times
ON /
Board
LWS2.0
LWS2.0
HEAT
Error Code
(SLM3 /
Netware 3)
(Red)
-
-
-
-
-
E1
E2
E3
E4
E6
E5
ON or OFF
Handset
G17 / SLM3 / Netware 3 / SLM8
G17 / SLM3 / Netware 3 / SLM8
Operation / Faulty
Indication
Cooling mode
Timer On
Heating mode
Auto mode in cooling
operation
Auto mode in heating
operation
Room air sensor
contact loose / short
Indoor coil sensor
contact loose / open
Outdoor coil sensor
contact loose / open
Compressor overload
protection
Pump fault
Gas leak
BLINKING
52
Action
-
-
-
-
-
Check room sensor connection
/ change room sensor
Check indoor coil sensor
connection / change indoor coil
sensor
Check outdoor coil sensor
connection / change outdoor
coil sensor
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
Diagnosis