DC Inverter Multi VRF System User Manual
23
7 Error Indication
Inquiry method of error indication: combine division symbol and content symbol to check the
corresponding error.
For example: division symbol L and content symbol 4 together means over-current protection.
Content symbol
Division symbol
0
1
2
3
4
5
Indoor
L
Malfunction of
IDU (uniform)
Protection of
indoor fan
Auxiliary heating
protection
Water-full
protection
Over-current
protection
Freeze
prevention
protection
d
Indoor PCB is
poor
Malfunction
of ambient
temperature
sensor
Malfunction
of entry-tube
temperature
sensor
Malfunction
of middle
temperature
sensor
Outdoor
E
Malfunction of
ODU (uniform)
High-pressure
protection
Discharge low-
temperature
protection
Low-pressure
protection
High discharge
temperature
protection of
compressor
High discharge
temperature
protection of
compressor 1
F
Main board of
ODU is poor
Malfunction of
high-pressure
sensor
Malfunction of
low-pressure
sensor
Malfunction
of discharge
temperature
sensor of
compressor 1
J
Over-current
protection of
compressor 1
b
Malfunction of
outdoor ambient
temperature
sensor
Malfunction
of defrosting
temperature
sensor 1
Malfunction
of liquid
temperature
sensor of sub-
cooler
Malfunction of
gas temperature
sensor of sub-
cooler
P
malfunction of
driving board
of compressor
(uniform)
Driving board
of compressor
operates
abnormally
(uniform)
Voltage
protection of
driving board
power of
compressor
(uniform)
Reset protection
of driving
module of
compressor
Drive PFC
protection of
compressor
Over-current
protection
of inverter
compressor
H
Malfunction of
driving board of
fan (uniform)
Driving board
of fan operates
abnormally
(uniform)
Voltage
protection of
driving board
power of fan
(uniform)
Reset protection
of driving
module of fan
Drive PFC
protection of fan
Over-current
protection of
inverter fan
Debugging
U
Preheat time of
compressor is
insufficient
Wrong setting of
ODU’s capacity
code/jumper cap
Refrigerant-
lacking
protection
Wrong address
for driving board
of compressor
C
Communication
malfunction
between IDU,
ODU and IDU’s
wired controller
Communication
malfunction
between
main control
and inverter
compressor
driver
Communication
malfunction
between main
control and
inverter fan
driver
Malfunction of
lack of IDU
Alarm because
project code
of IDU is
inconsistent
Status
A
Unit waiting for
debugging
Inquiry of
compressor
operation
parameters
Refrigerant
recovery
operation of
after-sales
Defrosting
Oil-return
Online test
n
SE operation
setting of system
Setting of
defrosting cycle
K1
Setting of upper
limit of IDU/
ODU capacity
distribution ratio
Limit setting for
max. capacity/
output capacity
