McQuay MMC User Manual

MCQUAY Service Guide Book Diagnosis
47
Ceiling Cassette A / B / C/ E Series Model
Model Board Handset
MCK 20/25/30/40/50A/AR L208A G17 / SLM3 / Netware 3 / SLM8
MCK 15/20/25B/BR L208A G17 / SLM3 / Netware 3 / SLM8
MCK 10/15/20C/CR L208A GS01 / G17 / SLM3 / Netware 3 / SLM8
MCK 20/25/28/40/50E/ER L208A GS01 / G17
POWER
(Green)
TIMER
(Orange)
SLEEP
(Red)
HEAT
(Red)
Error Code
(SLM3 /
Netware 3)
Operation / Faulty
Indication
Action
- Cooling mode -
- Timer On -
- Sleep mode 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 open
Check indoor coil sensor
connection / change
indoor coil sensor
E3
Outdoor coil sensor
contact open
Check outdoor coil
sensor connection /
change outdoor coil
sensor
E4
Compressor
overload protection /
Indoor coil sensor
short / Outdoor coil
sensor short
If running ampere highly
increase, change the
compressor. If not,
replace the coil sensor
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
E7
Outdoor coil sensor
exist (MS model)
Remove outdoor coil
sensor
E8
Hardware error (tact
switch pin short)
Replace the tact switch
control board
/
ON ON or OFF BLINKING
1 time
2 times
3 times
1 time
2 times
3 times
5 times
6 times

McQuay MMC Specifications

General

Brand	McQuay
Model	MMC
Category	Air Conditioner
Language	English