Gree CM100N1320, Service Manual

Page: 137 / 276

GREE GMV5 INDOOR UNIT SERVICE MANUAL
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 CO
2
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
1.2 Exception Analyzing and Troubleshooting
1.2.1
“d1” Indoor circuit board error
Error display: IDU wired controller and IDU receive light board will display
Error judgment condition and method:
Check if the reading of address chip and memory chip of IDU mainboard is normal. If the data of
address chip and memory chip cannot be read, it is abnormal
Possible reason:
■Address chip is abnormal
■Memory chip is abnormal. Replace main control board directly
Troubleshooting:
Replace main control board directly
1.2.2
“d3” Ambient temperature sensor error
Error display: IDU wired controller and IDU receive light board will display
Error judgment condition and method:
Sample the AD value of temperature sensor through temperature sensor detecting circuit and judge
the range of AD value, If the sampling AD value exceeds upper limit and lower limit in 5 seconds
continuously, report the error