McQuay MWM Service Manual page 44

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