McQuay MWM Service Manual page 49

MCQUAY Service Guide Book
Ceiling Exposed D Series Model
Model
MCM 20/25/30/40/50D/DR
COOL DRY
(Green) (Orange) (Green)
ON /
Board
U1.5 G7 / SLM3 / Netware 3 / SLM8
FAN HEAT
Error Code
(SLM3 /
Netware 3)
(Red)
Heat LED
blinking
(SLM3 only)
E1
E2
E3
E4
E5
ON or OFF
Handset
Operation / Faulty
Indication
- Cooling mode
- Dry mode
- Fan mode
- Heating mode
Auto mode in
-
cooling operation
Auto mode in
-
heating operation
Defrost mode
Room air sensor
contact loose / short
Indoor coil sensor
contact open / short
Outdoor coil sensor
contact open / short
Compressor
overload protection
Gas leak
BLINKING
48
Diagnosis
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
Check for leakage & repair /
Top up refrigerant