MCQUAY Service Guide Book Diagnosis
43
Wall Mounted F Series Heat Pump
Model Board Handset
MWM 10/15/20/25FR, 301R U1.5 G7 / SLM3 / Netware 3 / SLM8
MWM 07/10/15/20/25FR, 311/301R L2EF G7
COLD
(Green)
DRY
(Orange)
FAN
(Green)
HEAT
(Red)
SLEEP
(Red)
Error Code
(SLM3 /
Netware 3)
Operation /
Faulty
Indication
Action
- Cooling mode -
- Dry mode -
- Fan mode -
- Heating mode -
-
Auto mode in
heating
operation
-
-
Auto mode in
cooling
operation
-
Heat LED
blinking
(SLM3 only)
Defrost mode -
E1
Room air
sensor contact
loose / short
Check room sensor
connection / change
room sensor
E2
Indoor coil
sensor contact
loose / short
Check indoor coil
sensor connection /
change indoor coil
sensor
E3
Outdoor coil
sensor contact
loose / short
Check outdoor coil
sensor connection /
change outdoor coil
sensor
E4
Compressor
overload
protection
If running ampere
highly increase, change
the compressor
E5 Gas leak
Check for leakage &
repair / Top up
refrigerant
If the system is in auto or sleep mode, switch to heat or cool mode and turn OFF the
sleep function, turn OFF the power supply to reset the system, wait for 3 minutes and
ON the system again.*
If the system is in cool or heat mode (with the sleep function OFF), the sensor may
have contact problem, compressor overload protection trip or gas leak.*
Note: * Only applicable for L2EF Board.
/ ON ON or OFF BLINKING
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