D.C. Inverter Multi-variable Modular
54
7 Error Indication
Inquiry method of malfunction display: combine division number and content number to check the
corresponding malfunction.
For example, division number L and content number 4 together means power supply over-current
protection.
Content
symbol
Distinguish
symbol
Indoor fan Protection
Auxiliary heating
protection
Water overflow
protection
Overcurrent protection Free prevention
protection
Malfunction of ambient
temperature sensor
Indoor PCB is poor
Indoor
Outdoor
High-pressure
protection
Low-pressure
protection
High discharge tempe
-rature protection of
compressor
High discharge tempe
-rature protection of
compressor 1
Malfunction of dis
-charge temperature
sensor of compressor 1
Malfunction of low-
pressure sensor
Malfunction of high-
pressure sensor
Main board of outdoor
unit is poor
Other module
protection
Overcurrent protection
of compressor 1
Overcurrent protection
of compressor 2
Overcurrent protection
of compressor 3
Overcurrent protection
of compressor 4
Overcurrent protection
of compressor 5
Malfunction of condenser
temperature sensor
Malfunction of condenser
temperature sensor
Malfunction of defrosting
temperature sensor 2
Malfunction of defrosting
temperature sensor 1
Malfunction of outdoor
ambient temperature
sensor
Malfunction of driving
board of compressor
(unified)
Driving board of com
-pressor operates
abnormally
Voltage protection of
driving board
of compressor
Reset protection of
driving module of
compressor
Overcurrent protection
of inverter compressor
Overcu rrent protec tion
of inverter fan
Reset protection of
driving module of fan
Voltage protection of
driving board
of fan
Driving board of fan
operates abnormally
Malfunction of driving
board of fan(unified)
Debugging
Preheat time of
compressor is
insufficient
Communication malfunction
between indoor unit and
outdoor unit, indoor unit’s
wires controller
Wrong setting of out
-door unit’s capacity
code/jumper cap
Communication malfunction
between main control and
inverter compressor driver
Phase sequence
protection of power
Communication malfunction
between main control and
inverter fan driver
Refrigerant-lacking
protection
Malfunction of
lacking of indoor
unit
Wrong address for
driving board of
compressor
Project series No.
of indoor unit is
shocking
Oil-return
Limit setting for max.
capacity/output
capacity
Defrosting
Ref riger ant -recov ery
oper ation of
after-sal es
Debugging of unit
SE operation
setting of system
Status
Malfunction of IDU
(unified)
Malfunction of indoor
coil inlet temperature
sensor
Malfunction of indoor
mid-coil temperature
sensor
Malfunction of
ODU (unified)
Low discharge
temperature protection
Alarm because the
air quality is bad
PCB of wired contro
-lle r is abnormal
Curren t senso r of com
-presso r 1 is abnormal
Clock of system
is abnormal
High-voltag e protection
of compresso r’s driv e
DC bus bar
High-voltage pro tection
of fan’ s drive DC bus bar
Rated capacity
is too high
Heating
Heating only unit
Content
symbol
Distinguish
symbol
Mode conflictN
o master IDU
Webside address of
indoor unit is abnormal
Malfunction of
jumper cap
Malfunction of water
temperature sensor
Malfunction of
humidity sensor
Indoor
Outdoor
High discharge tempe
-rature protection of
compressor 2
High discharge tempe
-rature protection of
compressor 3
High discharge tempe
-rature protection of
compressor 4
High discharge tempe
-rature protection of
compressor 5
High discharge tempe
-rature protection of
compressor 6
Malfunction of dis
-charge temperature
sensor of compressor 6
Malfunction of dis
-charge temperature
sensor of compressor 5
Malfunction of dis
-charge temperature
sensor of compressor 4
Malfunction of dis
-charge temperature
sensor of compressor 3
Malfunction of dis
-charge temperature
sensor of compressor 2
Overcurrent protection
of compressor 6
High pressure ration
protection of system
Low pressure ration
protection of system
Freeze prevention
protection of system
Malfunction of oil-
return humidity sensor
Malfunction of heat
exchanger tempera
-ture sensor
Malfunction of outdoor
humidity sensor
Malfunction of suction
temperature sensor 2
Malfunction of suction
temperature sensor 1
Drive IPM module
protection of
compressor
Malfunction of drive
temperature sensor
of compressor
Drive IPM module
protection of compressor
Desyn chroni zing
prot ectio n of inverte r
com pressor
Desy nchroni zing
protection of invert er
fan
Drive IPM modul e
protection of fan
Malf unction of driv e
tempe ratur e sensor
of fan
Drive IPM module
protection of fan
Debugging
Alarm because valve
is abnormal
Alarm because number
of outdoor unit is
inconsistent
Malfunction of pipeline
for indoor unit
Emergency statu s
of compressor
Malfunction of pipe
-line for outdoor unit
Emergenc y status
of fan
Emergenc y status
of module
; i
ndoor
unit can’ t display
Hea t pump unit
Vacuum pump mode
Inquiry of parameters
Inquir y of malfunc
-tion of unit
Quie t mode setting
Heat pump
function setting
Inquiry of project series
number of indoor unit
Status
Lack of power supply
For single control over
multiple units, IDU no.
is not correct.
For single control over
multiple units, IDU
series is not correct
Malfunction of indoor
coil temperature
sensor
4-
flow protection
way valve back
