McQuay MWM Service Manual page 47

MCQUAY Service Guide Book
Ceiling Cassette A / B / C Series Model
Model
MCK 20/25/30/40/50A/AR
MCK 15/20/25B/BR
MCK 10/15/20C/CR
POWER TIMER
(Green) (Orange)
Continuously
Once every 3s
Twice every 3s
3 times
every 3s
4 times
every 3s
ON /
Board
U1.5 G7 / SLM3 / Netware 3 / SLM8
U1.5 G7 / SLM3 / Netware 3 / SLM8
U1.5 G7 / SLM3 / Netware 3 / SLM8
SLEEP HEAT
Error Code
Netware 3)
(Red) (Red)
Heat LED
/
(SLM3 only)
E1/E2/E3
ON or OFF
Handset
Operation /
(SLM3 /
Faulty Indication
- Cooling mode
- Timer On
- Sleep mode On
- Heating mode
Frost prevention
blinking
mode
Compressor
E4 overload
protection
E6 Pump fault
E5 Gas leak
Room / indoor /
outdoor coil
sensor contact
loose / short
BLINKING
46
Diagnosis
Action
-
-
-
-
-
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
Check room/indoor/
outdoor coil sensor
connection / change
room/indoor/outdoor
sensor