Gree GMV-ND45T/A-T

MULTI VRF-Ⅱ INDOOR UNIT SERVICE MANUAL EUROPEAN/LATIN AMETICA (R410A)
112
MAINTENANCE
1 Troubleshooting
1.1 Malfunction list for the wired controller
Display
code
Content
Display
code
Content
Display
code
Content
L0
Malfunction of
indoor unit
L9
Wrong number of indoor
unit for one-to-more
indoor unit
d8
Malfunction of water
temperature sensor
L1
Indoor fan
protection
LA
Wrong series for one-to-
more indoor unit
d9
Malfunction of jumper cap
L2
E-heater
protection
LH
Alarming due to bad air
quality
dA
Abnormal address for
indoor unit
L3
Water overflow
protection
LC
The indoor unit model
can’t match with outdoor
unit model
dH
Abnormal PCB for wired
controller
L4
Power supply
of wired controller
is faulted
d1
Poor indoor PCB
dC
Abnormal code-dialing
setting of capacity
L5
Freeze prevention
protection
d3
Malfunction of ambient
temperature sensor
dL
Malfunction of air
exhause temperature
sensor
L6
Mode shock
d4
Malfunction of entry tube
temperature sensor
dE
Malfunction of indoor C02
sensor
L7
No main indoor
unit
d6
Malfunction of exit tube
temperature sensor
C0
Communication
malfunction
L8
Insufficient power
supply
d7
Malfunction of humidity
sensor
AJ
Clean alarming for filter
db
Special code: engineering debugging code
2 After-sales Emergency Masures
When some unrecoverable fault occurs to one module which is connected with several others in
parallel, the following emergency measures are recommended to guarantee the heating or cooling
capacity of the indoor units and the service life of modules except the faulted one are not affected.
Step 1: set all indoor units under “Off” mode and cut off the power supply to the indoor and outdoor units.
Step 2:.shut off all cutoff valves of the faulted outdoor unit, including the cutoff valves of the liquid/gas
pipe as well as the oil balancing valve.
Step 3: cut off the air switch of the module.
Step 4: remove the communication line between the faulted module and other modules which are still
kept connected through the communication line.
Step 5: readjust the address and quantity settings on the main board of the modules except the faulted
one.
Step 6: power and restart the unit.
3 Wiring Diagram
NOTE:
This drawing is just for reference; please always refer to the electric wiring stuck to the unit for actual
wiring.