McQuay MMC User Manual

MCQUAY Service Guide Book Diagnosis
46
Ceiling Cassette A / B / C Series Model
Model Board Handset
MCK 20/25/30/40/50A/AR U1.5 G7 / SLM3 / Netware 3 / SLM8
MCK 15/20/25B/BR U1.5 G7 / SLM3 / Netware 3 / SLM8
MCK 10/15/20C/CR U1.5 G7 / SLM3 / Netware 3 / SLM8
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 -
Heat LED
blinking
(SLM3 only)
Frost prevention
mode
-
E4
Compressor
overload
protection
If running ampere highly
increase, change the
compressor
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
E1/E2/E3
Room / indoor /
outdoor coil
sensor contact
loose / short
Check room/indoor/
outdoor coil sensor
connection / change
room/indoor/outdoor
sensor
/
ON ON or OFF BLINKING
/
Once every 3s
3 times
ever
y
3s
Twice every 3s
Continuously
4 times
every 3s

McQuay MMC Specifications

General

Brand	McQuay
Model	MMC
Category	Air Conditioner
Language	English