McQuay MWM Service Manual page 48

MCQUAY Service Guide Book
Ceiling Cassette A / B / C/ E Series Model
Model
MCK 20/25/30/40/50A/AR
MCK 15/20/25B/BR
MCK 10/15/20C/CR
MCK 20/25/28/40/50E/ER
POWER TIMER
(Green) (Orange)
1 time
2 times
3 times
1 time
2 times
3 times
5 times
6 times
ON /
Board
L208A
L208A
L208A GS01 / G17 / SLM3 / Netware 3 / SLM8
L208A
SLEEP HEAT
Error Code
Netware 3)
(Red) (Red)
ON or OFF
Handset
G17 / SLM3 / Netware 3 / SLM8
G17 / SLM3 / Netware 3 / SLM8
GS01 / G17
Operation / Faulty
(SLM3 /
Indication
- Cooling mode
- Timer On
- Sleep mode On
- Heating mode
Auto mode in
-
cooling operation
Auto mode in
-
heating operation
Room air sensor
E1
contact loose / short
Indoor coil sensor
E2
contact open
Outdoor coil sensor
E3
contact open
Compressor
overload protection /
E4 Indoor coil sensor
short / Outdoor coil
sensor short
E6 Pump fault
E5 Gas leak
Outdoor coil sensor
E7
exist (MS model)
Hardware error (tact
E8
switch pin short)
BLINKING
47
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. If not,
replace the coil sensor
Clear the clogging at
drain pipe. If pump is not
working, change the
pump
Check for leakage &
repair / Top up refrigerant
Remove outdoor coil
sensor
Replace the tact switch
control board