McQuay MWM Service Manual page 55

MCQUAY Service Guide Book
Wall Mounted F Heatpump Inverter-X Model
Model
MWMX 10/15FR
COOL/DRY HEAT
/
(Green) (Red)
ON /
Board
VA2.0
STAND-
BY/FAN TIMER
(Orange) (Orange)
/
/
/
/
ON or OFF
Handset
G17 / SLM3
Error
Operation / Faulty
Code
Indication
(SLM3)
-- Cooling mode
-- Dry mode
Stand-by / Fan
--
mode
-- Heating mode
-- Auto mode
-- Defrost mode
Indoor temperature
E1 sensors contact
loose / short
Outdoor
E2 temperature sensor
contact loose / short
Communication
E3 error between
indoor and outdoor
Compressor
E4
overload protection
Gas leak /
E6 compressor
overheat
Inverter error / PFC
E7
error
Outdoor total
E8 current trip / DC
peak
Indoor fan feedback
E9
error
BLINKING
54
Diagnosis
Action
-
-
-
-
-
-
Check indoor coil sensor
connection / change indoor
coil sensor
Check outdoor coil sensor
connection / change
outdoor coil sensor
Check connection wires
between indoor and
outdoor
If running ampere highly
increase, change the
compressor
Check for leakage & repair
/ Top up refrigerant
Check supply voltage and
compressor phase
Check the input current
and discharge pressure
Check indoor fan motor /
fan motor wiring