GMV DC Inverter VRF
65
7.2 Error Indication
NOTE!
For specific unit fault and maintenance, please refer to the engineering debugging and after-sales
maintenance manual of DC inverter VRF unit.
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Content
Content
Indoor
Auxiliary heating protection
L4
Abnormal power supply for wired
controller
L5 Freeze prevention protection
L6 Mode conflict L7 No main IDU
L8 Power supply is insufficient L9
For single control over multiple
units, number of IDU is
inconsistent (HBS network)
LA
For single control over multiple
units, IDU series is inconsistent
LH Alarm due to bad air quality
LC
IDU is not matching with outdoor
unit
LL Malfunction of water flow switch
LE
Rotation speed of EC DC water
pump is abnormal
LF Malfunction of shunt valve setting
LJ
Setting of functional DIP switch
code is wrong
LP
Zero-crossing malfunction of PG
motor
LU
Indoor unit’s branch is not
inconsistent for one-to-more unit of
heat recovery system
Lb
For single control over multiple
units, IDU is inconsistent
(reheating-dehumidifying system)
d1 Indoor PCB is poor d2
Malfunction of lower water
temperature sensor of water tank
d3
Malfunction of ambient temperature
sensor
d4
Malfunction of entry-tube
temperature sensor
d5
Malfunction of mid-tube
temperature sensor
d6
Malfunction of exit-tube
temperature sensor
d7 Malfunction of humidity sensor d8
Malfunction of water temperature
sensor
Malfunction of jumper cap
Web address of IDU is abnormal
dH PCB of wired controller is abnormal dC
Setting capacity of DIP switch code
is abnormal
dL
Malfunction of air outlet
temperature sensor
dE Malfunction of indoor CO
2
sensor
dF
Malfunction of upper water
temperature sensor of water tank
dJ
Malfunction of backwater
temperature sensor
dP
Malfunction of inlet tube
temperature sensor of generator
dU
Malfunction of drainage pipe
temperature sensor of generator
db Debugging status dd
Malfunction of solar power
temperature sensor
dn Malfunction of swing parts dy
Malfunction of water temperature
sensor
y1
Malfunction of entry-tube
temperature sensor 2
y2
Malfunction of exit-tube
temperature sensor 2
y7
Malfunction of fresh air inlet
temperature sensor
y8 Malfunction of IDU’s air box sensor
yA Malfunction of IFD o1
Low-voltage protection of IDU’s
bus bar
o2
High-voltage protection of IDU’s
bus bar
o3 IPM module protection of IDU
Over-current protection of IDU
o6
Malfunction of current detection
circuit of IDU
o7 Desynchronizing protection of IDU
o8
Communication malfunction of
IDU’s driver
o9
Communication malfunction of
IDU’s main control
oA
Drive IPM high temperature
protection of IDU
ob
Malfunction of drive temperature
sensor of IDU
oC Malfunction of charging loop of IDU o0 Other malfunction of drive
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