Argo AFSI ECO 120HL UI User manual

Please read this manual carefully before installing and using the air conditioner, and retain for
future reference.
V 09/22
SERVICE MANUAL
X3 FLOOR STANDING
AIR CONDITIONERS
R32 - WIFI
,1'22R UNIT
AFSI ECO 120HL8,
OUTDOOR UNIT
AFSI ECO 120SH3 UO

1
Display method of indoor unit
Malfunction
name AC status Possible causes
Error
code
Indicator display
Power
indicator
Cool
indicator
Heat
indicator
Flash
15
times
Malfunction of
jumper cap
The complete unit stops operation 1. Jumper cap is not installed in control panel;
2. Poor contact of jumper cap;
3. Jumper cap is damaged;
4. The tested circuit of jumper cap on control panel is abnormal.
Flash 6
times
Communication
malfunction
between indoor
unit and outdoor
unit
Cool: compressor stops
operation, while indoor fan
operates;
Heat: all loads stops operation.
See Page 10 “Communication malfunction”
Flash 5
times
IPM protection Cool/Dry: compressor stops
operation, while indoor fan
operates.
Heat: all loads stops operation.
See Page 12 “IPM protection, over-phase current of
compressor”
Malfunction of
outdoor fan/
malfunction of
DC motor
Cool/Dry: all loads stops
operation except indoor fan.
Heat: all loads stops operation.
1. Outdoor condenser, air inlet and air outlet are blocked by lth
or dirt;
2.Fan is blocked or loosened;
3.Motor or connection wire of motor is damaged;
4.Main board of outdoor unit is damaged;
(As for dual-outdoor fan, L3 indicates fan 1; LA indicates fan 2)
Flash 3
times
Overload
protection of
compressor
Cool/Dry: compressor stops
operation, while indoor fan
operates.
Heat: all loads stops operation.
1. Overload wire of compressor is loose;
2. The overload protector is damaged. Under normal
circumstances, the resistance between both ends of terminal is
less than 1ohm.
3.See Page 13 “Overload protection of compressor , High
discharge temperature protection of compressor”
Refrigerant
insufcient
protection, cut-
off protection of
refrigerant
Cool: compressor and outdoor
fan stops operation, while indoor
fan operates;
Heat: Compressor, outdoor fan
and indoor fan stops operation.
1. Is system cooling under high humidity environment, thus
temperature difference of heat transfer is small;
2. Check whether the big valve and small valve of outdoor unit
are opened completely;
3. Is the temperature sensor of evaporator of indoor unit loose?
4. Is the temperature sensor of condenser of outdoor unit
loose?
5. Is the capillary or the electronic expansion valve blocked?
6. Is refrigerant leaking?
Flash
once
Indoor ambient
temperature
sensor is open/
short-circuited
Cool/Dry: indoor fan operates,
while compressor and outdoor fan
stops operation;
Heat: all loads stops operation.
1. Temperature sensor is not well connected;
2. Temperature sensor is damaged
(refer to Page 33 “Table 1”)
3. Main board of indoor unit is damaged.
Flash
twice
Indoor
evaporator
temperature
sensor is open/
short-circuited
Cool/Dry: indoor fan operates,
while compressor and outdoor fan
stops operation;
Heat: all loads stops operation.
1. Temperature sensor is not well connected;
2. Temperature sensor is damaged
(refer to Page 33 “Table 2”)
3. Main board of indoor unit is damaged.
Flash
11
times
No feedback
from indoor
unit’s motor
The complete unit stops operation 1. Is the fan blocked?
2. Is the motor terminal loose?
3. Is the connection wire of motor damaged?
4. Is the motor damaged?
5. Is the main board of indoor unit damaged?
Indoor unit and
outdoor can be
matched with
each other
Heat: compressor, outdoor unit
and indoor fan stops operation.
Capacity of indoor unit and outdoor unit can’t be matched.
Malfunction of
jumper cap of
outdoor unit
Heat: all loads are stopped;
other modes: outdoor unit stops
operation.
Jumper cap of outdoor unit hasn’t been installed.
Flash
22
times
Gas valve
temperature
sensor is ON /
short-circuited
1. Temperature sensor is not well connected or damaged; (refer
to Page 33 “Table 2”)
2. The wire of temperature sensor is damaged, causing short
circuit to copper pipe or outer casing;
3. Main board of outdoor unit is damaged.
Error Code List
Applicable model: split type and oor standing unit

2
Display method of indoor unit
Malfunction
name AC status Possible causes
Error
code
Indicator display
Power
indicator
Cool
indicator
Heat
indicator
Flash
19
times
Liquid valve
temperature
sensor is ON /
short-circuited
1. Temperature sensor is not well connected or damaged; (refer
to Page 33 “Table 2”)
2. The wire of temperature sensor is damaged, causing short
circuit to copper pipe or outer casing;
3. Main board of outdoor unit is damaged.
Flash
once
High pressure
protection of
system
Cool/Dry: all loads stops
operation except indoor fan;
Heat: all loads stops operation.
1. Heat exchange of outdoor unit is too dirty, or it blocked the
air inlet/outlet;
2. Ambient temperature is too high;
3. Is power voltage normal; (three-phase unit)
4. Refrigerant is too much.
5. Wiring of high pressure switch is loose or high pressure
switch is damaged;
6. The internal system is blocked; (dirt blockage, ice blockage,
oil blockage, angle valve is not completely opened)
7. Main board of outdoor unit is damaged;
Flash 3
times
Low pressure/
low system
pressure
protection/
compressor
low pressure
protection
Cool: compressor, outdoor fan
and indoor fan stop operation;
Heat: compressor and outdoor
fan stop operation at rst. About
1min later, indoor fan stops
operation; 2mins later, the 4-way
valve stop operation.
1. Low pressure switch is damaged;
2. Refrigerant inside the system is insufcient.
Flash 4
times
High discharge
temperature
protection of
compressor
Cool/Dry: compressor and
outdoor fan stops operation, while
indoor fan operates;
Heat: all loads stops operation.
See Page 13 “Overload protection of compressor , High
discharge temperature protection of compressor”
Fixed speed unit:
1. System abnormality; (e.g.: blockage)
2. Rotate speed of outdoor motor is abnormal; (cooling)
3. Outdoor air inlet is abnormal; (cooling)
4. System is normal, but the resistance of compressor
exhausting temperature sensor is abnormal or poorly
connected.
Flash 5
times
AC overcurrent
protection
Cool/Dry: compressor and
outdoor fan stops operation, while
indoor fan operates;
Heat: all loads stops operation.
1. Power voltage is unstable;
2. Power voltage is too low;
3. System load is too high, which leads to high current;
4. Heat exchange of indoor unit is too dirty, or it blocked the air
inlet/outlet;
5. Fan motor operation is abnormal; the fan speed is too low or
not functioning;
6. Compressor is blocked;
7. The internal system is blocked; (dirt blockage, ice blockage,
oil blockage, angle valve is not completely opened)
8. Main board of outdoor unit is damaged.
See Page 24 “AC overcurrent protection”
Flash 7
times
Mode shock/
sysmte mode
shock
Load of indoor unit stops
operation (indoor fan, E-heater,
swing)
Malfunction of one-to-more system; there may be two indoor
units which has set the shock mode, such as one is cooling
and the other is heating.
Flash 8
times
High
temperature
prevention
protection
Cool: compressor stops operation
while indoor fan operates;
Heat: all loads stops operation.
See Page 17 “High temperature prevention protection; high
power; system isabnormal”
Flash
15
times
Malfunction of
EEPROM
Cool/Dry: compressor stops
operation, while indoor fan
operates;
Heat: all loads stops operation.
Main board of outdoor unit is damaged.
Flash
once
Flash
once
Refrigerant-
recovery mode
Cool/Dry: compressor and
outdoor fan stops operation, while
indoor fan operates.
Refrigerant recovery. The maintenance personnel operate it
when he is maintaining the unit.
Flash 3
times
Outdoor
ambient
temperature
is open/short-
circuited
Cool/Dry: compressor and
outdoor fan stop operation, while
indoor fan operates;
Heat: all loads stops operation.
1. Temperature sensor is not connected well or damaged; (refer
to Page 33 “Table 1”)
2.Temperature sensor wire of outdoor unit is damaged; short
circuit between the temperature sensor and copper pipe or
outer case
3.Main board of outdoor unit is damaged;
Flash 4
times
Outdoor
condenser
temperature
sensor is open/
short-circuited
Cool/Dry: compressor and
outdoor fan stop operation, while
indoor fan operates;
Heat: after operating for 3mins,
all loads stops operation.
1. Temperature sensor is not connected well or damaged; (refer
to Page 33 “Table 2”)
2. Temperature sensor wire of outdoor unit is damaged; short
circuit between the temperature sensor and copper pipe or
outer case;
3. Main board of outdoor unit is damaged.

3
Display method of indoor unit
Malfunction
name AC status Possible causes
Error
code
Indicator display
Power
indicator
Cool
indicator
Heat
indicator
Flash 5
times
Outdoor air
discharge
temperature
is open/short-
circuited
Complete unit stops operation;
motor of sliding door is cut off
power.
1. The exhaust temperature sensor is not connected well or
damaged. (refer to Page 33 “Table 3”)
2.Temperature sensor wire of outdoor unit is damaged; short
circuit between the temperature sensor and copper pipe or
outer case
3.Main board of outdoor unit is damaged;
Malfunction of
micro switch
Cool/Dry: compressor stops
operation, while indoor fan
operates;
Heat: all loads stops operation.
1. The sliding door is blocked;
2. Malfunction of the photoelectric inspection panel of sliding
door;
Flash 4
times
System is
abnormal
Cool/Dry: all loads stops
operation except indoor fan;
Heat: all loads stops operation.
See Page 17 “High temperature prevention protection; high
power; system isabnormal”
Flash 7
times
Desynchronizing of
compressor
Cool/Dry: compressor stops
operation, while indoor fan
operates; Heat: all loads stops
operation.
See “Page 19 “Desynchronization diagnosis for compressor”
Flash 6
times
PFC protection Cool/Dry: compressor stops
operation, while indoor fan
operates; Heat: all loads stops
operation.
1. The power grid quality is bad; AC input voltage uctuates
sharply;
2. Power plug of air conditioner or wiring board or reactor is not
connected reliably;
3. Indoor and outdoor heat exchanger is too dirty, or air inlet/
outlet is blocked;
4. Main board of outdoor unit is damaged.
Flash
14
times
Demagnetization
protection of
compressor
Cool: compressor and outdoor fan
stop operation; Heat: compressor
and outdoor fan stop operation at
rst; about 1min later, indoor fan
stops operation.
1. The main board of outdoor unit is damaged;
2. Compressor is damaged;
Communication
malfunction
between indoor
unit and inspection
board
Normal operation 1. Poor connection between the indoor unit and the inspection
board.
2.The main board of indoor unit is damaged;
3. The inspection board is damaged;
Malfunction of
humidity sensor
Compressor, outdoor fan and
indoor fan stop operation;
The inspection board is damaged.
High power
protection
Cool: compressor and outdoor
fan stops operation, while indoor
fan operates.
See Page 17 “High temperature prevention protection; high
power; system isabnormal”
Flash
11
times
Start-up failed Cool/Dry: compressor stops,
while indoor fan operates; Heat:
all loads stops operation.
See Page 20 “Malfunction diagnosis for failure startup”
Lost phase Cool: compressor and outdoor fan
stop operation; Heat: compressor
and outdoor fan stop operation at
rst; about 1min later, indoor fan
stops operation.
1. The main board of outdoor unit is damaged;
2. The compressor is damaged;
3. The connection wire of compressor is not connected well.
Undened
outdoor unit
error
Cool: compressor and outdoor
fan stops operation, while indoor
fan operates; Heat: compressor,
outdoor fan and indoor fan stop
operation.
1. Outdoor ambient temperature exceeds the operation range
of unit (eg: less than-20oC or more than 60oC for cooling; more
than 30oC for heating);
2. Are wires of compressor not connected tightly?
3. Failure startup of compressor?
4. Is compressor damaged?
5. Is main board damaged?
Flash
15
times
Over-phase
current
protection of
compressor
Cool/Dry: compressor stops
operation, while indoor fan
operates; Heat: all loads stops
operation.
See “Page 13 “Overload protection of compressor , High
discharge temperature protection of compressor”
Flash
16
times
Communication
malfunction
between the
drive board and
the main board
Cool: compressor and outdoor
fan stops operation; Heat:
compressor and outdoor fan stop
at rst; about 1min later, indoor
fan stops operation;
1. The drive board is damaged;
2. The main board of outdoor unit is damaged;
3. The drive board and the main board is not connected well.
Flash
18
times
Circuit
malfunction
of module
temperature
sensor
Cool/Dry: compressor stops
operation, while indoor fan
operates; Heat: all loads stops
operation.
Replace outdoor control board

4
Display method of indoor unit
Malfunction
name AC status Possible causes
Error
code
Indicator display
Power
indicator
Cool
indicator
Heat
indicator
Flash
19
times
Module
overheating
protection
Cool: compressor stops
operation, while indoor fan
operates; Heat: all loads stops
operation.
1. Air inlet / air outlet of outdoor unit are blocked by lth or dirt;
2. Condenser of outdoor unit is blocked by lth or dirt;
3. IPM screw of main board is not tightened;
4. Main board of outdoor unit is damaged;
Malfunction
of ambient
temperature sensor
of drive board
Cool: compressor, outdoor fan
and indoor fan stop operation;
Heat: compressor and outdoor
fan stop operation at rst; about
1min later, indoor fan stops
operation.
1. The ambient temperature sensor of the drive board is not
connected well;
2. Malfunction of the ambient temperature sensor of drive
board.
Flash
11
times
DC bus voltage is
too high
Cool/Dry: compressor stops
operation, while indoor fan
operates; Heat: all loads stops
operation.
1. Measure the voltage between position L and position N on
the wiring board (XT). If it’s higher than 265 VAC, please turn
on the unit until the power voltage is decreased to the normal
range;
2. If the AC input is normal, please replace the outdoor control
board.
Flash
21
times
DC bus voltage
is too low
Cool/Dry: compressor stops
operation, while indoor fan
operates; Heat: all loads stops
operation.
1. Measure the voltage between position L and position N on
the wiring board (XT). If it’s lower than 150 VAC, please turn
on the unit until the power voltage is increased to the normal
range;
2. If the AC input is normal, please replace the outdoor control
board.
Flash
17
times
Charging
malfunction of
capacitor
Cool/Dry: compressor stops
operation, while indoor fan
operates; Heat: all loads stops
operation.
See “Page 21 “Charging malfunction of capacitor”
Malfunction of RF
module
Cool: compressor and outdoor fan
stop operation; Heat: compressor
and outdoor fan stop operation at
rst; about 1min later, indoor fan
stops operation.
1. The connection wire of RF module is not connected well.
2. Malfunction of RF module;
Flash
13
times
Phase current
detection circuit
malfunction of
Cool: compressor and outdoor
fan stops operation, while indoor
fan operates; Heat: compressor,
outdoor fan and indoor fan stops
operation.
The control board is damaged
Flash
12
times
Lost phase
protection of
compressor
Cool: compressor and outdoor fan
stop operation; Heat: compressor
and outdoor fan stop operation at
rst; about 1min later, indoor fan
stops operation.
1. The main board of outdoor unit is damaged;
2. The compressor is damaged;
3. The connection wire of compressor is not connected well.
Flash
20
times
DC bus
voltage drop
malfunction
Cool/Dry: compressor stops
operation, while indoor fan
operates; Heat: all loads stops
operation.
The power voltage is unstable.
Current
detection
malfunction of
unit
Cool: compressor and outdoor
fan stops operation, while indoor
fan operates; Heat: compressor,
outdoor fan and indoor fan stops
operation.
1. Is the complete unit lacking of refrigerant?
2. There’s malfunction for the circuit of control board of outdoor
unit. Replace the control board of outdoor unit.
4-way valve is
abnormal
This malfunction occurs when
the unit is heating. All loads stops
operation.
1. Power voltage is lower than AC175V;
2. Wiring terminal of 4-way valve is loose or broken;
3. 4-way valve is damaged. Replace the 4-way valve.
Flash
17
times
Malfunction of
zero-crossing
signal of indoor
unit
Compressor, outdoor fan and
indoor fan stop operation.
1. The power is abnormal;
2. Main board of indoor unit is damaged.
Zero-crossing
malfunction of
outdoor unit
Cool: compressor stops
operation, while indoor fan
operates; Heat: all loads stops
operation.
Replace the control board of outdoor unit.

5
Note:
1. As for the models with “ ” display, when there’s malfunction, the dual-8 nixie tube displays the error code, while the
indicator may not ash.
2. The AC status may be different for different models. Please refer to the corresponding manual for the model.
Display method of indoor unit
Malfunction
name AC status Possible causes
Error
code
Indicator display
Power
indicator
Cool
indicator
Heat
indicator
Evaporator
anti-freezing
protection
Not error code, it is the status code in cooling process
Anti cold air
protection
Not error code, it is the status code in heating process
Flash
once/
10s
Defrosting Not error code, it is the status code in heating process
Applicable model: window type, TTW, PTAC, portable type and recreational vehicle AC
Display method of indoor
unit
Malfunction
name AC status Possible causes
Error
code
Indicator
display
Status
LED
(PTAC)
Heat
indicator
Jumper cap
error
All loads stop 1. Jumper cap is not installed in control panel;
2. Poor contact of jumper cap or jumper cap is damaged;
3. The tested circuit of jumper cap on control panel is abnormal.
Indoor ambient
temperature
sensor is short-
circuited
Cool, fan and dry:
compressor and outdoor fan stops
operation, while indoor fan operates;
Heating: All loads stop.
1. Temperature sensor is not well connected;
2. The connection wire is short circuit or open circuit, and the
temperature sensor is damaged. (refer to Page 33 “Table 1”)
Indoor tube
temperature
sensor is short-
circuited
Cool, fan and dry:
compressor and outdoor fan stops
operation, while indoor fan operates;
Heating: All loads stop.
1. Temperature sensor is not well connected;
2. The connection wire is short circuit or open circuit, and the
temperature sensor is damaged. (refer to Page 33 “Table 2”)
Outdoor
ambient
temperature
sensor is short-
circuited
Cool, fan and dry:
compressor and outdoor fan stops
operation, while indoor fan operates;
Heating: All loads stop.
1. Temperature sensor is not well connected;
2. The connection wire is short circuit or open circuit, and the
temperature sensor is damaged. (refer to Page 33 “Table 1”)
Outdoor tube
temperature
sensor is short-
circuited
Cool, fan and dry:
compressor and outdoor fan stops
operation, while indoor fan operates;
Heating: All loads stop.
1. Temperature sensor is not well connected;
2. The connection wire is short circuit or open circuit, and the
temperature sensor is damaged. (refer to Page 33 “Table 2”)
Temperature
sensor of air
outlet is short-
circuited
Cool, fan and dry:
compressor and outdoor fan stops
operation, while indoor fan operates;
Heating: All loads stop.
1. Temperature sensor is not well connected;
2. The connection wire is short circuit or open circuit, and the
temperature sensor is damaged. (refer to Page 33 “Table 1”)

6
Display method of indoor
unit
Malfunction
name AC status Possible causes
Error
code
Indicator
display
Status
LED
(PTAC)
Heat
indicator
Lacking uorine
protection
Cool and dry:
compressor and outdoor fan stops
operation, while indoor fan operates;
1. Heat exchanger is too dirty/blocks the air inlet/outlet;
2. Compressor operation is abnormal, strange noise or leakage
occurs. Temperature of outer casing is too high;
3. The internal system is blocked (dirt blockage, ice blockage, oil
blockage and the 4-way valve is not completely opened);
4. The pipeline is fractured or rusted, and the refrigerant is leaked.
Compressor is
overloaded
Cool and dry:
compressor and outdoor fan stops
operation, while indoor fan operates;
1. Heat exchanger is too dirty/blocks the air inlet/outlet;
2. The rotate speed of fan is abnormal, rotate speed is too low or the
fan is not functioning;
3. Compressor operation is abnormal;
4. The internal system is blocked;
5. Refrigerant leakage, resulting in overheating protection of
compressor;
6. Applied in poor condition of high temperature and high humidity.
See Page 14 “Overload protection (window type, TTW, PTAC,
portable type, recreational vehicle AC and dehumidier”)
Overload Cool and dry:
compressor and outdoor fan stops
operation, while indoor fan operates;
1. Operation environment is bad; (Applied in poor condition of high
temperature and high humidity)
2. Heat exchanger is too dirty/blocks the air inlet/outlet;
3. The rotate speed of fan is abnormal, rotate speed is too low or the
fan is not functioning;
4. Compressor operation is abnormal;
5. The internal system is blocked;
6. If the outer tube temperature sensor on main board normal.
See Page 18 “Overload”
WiFi
communication
error
Load operation is normal, the APP
cannot control the air conditioner
normally
1. The connection between the indoor unit and detection plate is poor;
2. The inspection board is damaged;
3. Main board of the indoor unit is damaged.
Electrical
heating
operation error
(window type)
Cool, fan and dry:
compressor stops operation, while
the fan operates in high speed;
Heating: other loads stop operation,
while the indoor unit operates in high
speed.
1. Wiring is wrong;
2. Electric heater tube is damaged;
3. Main board of the indoor unit is damaged.
See Page 25 “Electrical heating operation error”
Compressor
is bonded with
the relay of
electrical heater
(PTAC)
Other loads stop operation, while the
indoor unit operates.
Relay adhesion;
See Page 26 “Relay adhesion error”
Communication
error of wired
controller and
indoor unit
The wired controller cannot control
the air conditioner
1. The connection between the indoor unit and wired controller is
poor;
2. he wired controller is damaged;
3. Main board of the indoor unit is damaged.
See Page 11 “Communication error between wired controller and
indoor unit”
Communication
error of indoor
and outdoor
unit
Cool, fan and dry: compressor and
outdoor unit stops operation, while
the indoor fan operates.
Heating: all loads stop operation.
1. The connection wire of indoor and outdoor unit is poor;
2. Wiring inside the unit is abnormal and damaged;
3. Communication circuit of control panel of indoor or outdoor unit is
abnormal;
See Page 10 “Communication error of indoor and outdoor unit”
Compressor
overload
protection
Compressor, electrical heater and
outdoor fan stops operation, while
indoor fan operates.
1. Voltage of unit operation is too low;
2. Start-up current of compressor is too high;
3. Compressor is blocked;
Current
imbalance error
(zero live line
current)
All loads stop 1. Wire connection and insertion is wrong;
2. Leakage of electricity;
3. Electrical heater is short circuit and loose.
See Page 27 “Current imbalance error”
Combination
method of
electrical
heating is
incorrect
All loads stop 1. Wire connection and insertion is wrong;
2. Electrical heater is off.
See Page 28 “Combination method of electrical heating is incorrect”
Operation
current of
electrical
heating is
abnormal
All loads stop 1. Parts of the electrical heater is open circuit or short circuit;
2. Electrical heater is abnormal.
See Page 29 “Operation current of electrical heating is abnormal”

7
Display method of indoor
unit
Malfunction name AC status Possible causes
Error
code
Indicator
display
Status
LED
(PTAC)
Heat
indicator
Circuit of
temperature limiter
is disconnected
All loads stop 1. Temperature limiter is fused;
2. Load connecting wire of electrical heater is disconnected.
See Page 30 “Circuit of temperature limiter is
disconnected”
Low temperature
protection
Start electric heating operation Ambient temperature is low, or the resistance of temperature
sensor is abnormal
Flash 9
times
Wrong hint on wired
controller wiring
The unit will judge operation according to
the signal of wired controller
Wired controller wiring is wrong
Flash 6
times
High temperature
protection of
outdoor condenser
Compressor stops operation, while the
indoor fan operates, and the outdoor fan
will be ON/OFF depends on the tube
temperature of condenser.
Not error code, it is the status code in cooling process
Flash 5
times
Anti-freezing
protection of
evaporator
Compressor and outdoor fan stops
operation, while the indoor fan operates
Not error code, it is the status code in cooling process
Flash 8
times
High temperature
protection of
evaporator
Compressor and outdoor fan will be ON/
OFF depends on the tube temperature
of evaporator, while the indoor fan will
operate.
Start electrical heating;
Not error code, it is the status code in heating process
Flash 7
times
Frost prevention
(heat pump)
Compressor and outdoor fan stops
operation, while the indoor fan will
operate.
Start electrical heating;
Not error code, it is the status code in heating process
Defrosting
protection
Under heating mode, the unit will stop
operation, while the compressor will
operate normally
Not error code, it is the status code in heating process
Flash
once /
10S
Full water
protection
All loads stop operation 1. The structure of water tank is abnormal;
2. Component on liquid level switch is abnormal;
See Page 31 “Troubleshooting on full water protection”
Low voltage
protection
All loads stop operation 1. Voltage of the unit is less than 184V;
2. The detected circuit is damaged.
Note:
The AC status may be different for different models. Please refer to the corresponding manual for the model.

8
Display method of
indoor unit
Malfunction name Operation status Possible causes
Error
code
Indicator
display
Full water
LED
Temperature and humidity sensor
Temperature sensor is open/
short-circuited
All loads stop Temperature sensor is not well connected or is damaged (refer to
Page 34 “Table 4”)
Communication error of
temperature and humidity sensor
Temperature sensor is not well connected or is damaged
Indoor evaporator temperature
sensor is open/ short-circuited
All loads stop Temperature sensor is not well connected or is damaged (refer to
Page 33 “Table 2”)
Discharge temperature sensor
of compressor is open/ short-
circuited
All loads stop Temperature sensor is not well connected or is damaged (refer to
Page 33 “Table 3”)
Temperature and humidity sensor
Humidity temperature sensor is
short-circuited
All loads stop Humidity sensor is polluted by foreign matter, which leads to short
circuit or soaking
Temperature and humidity sensor
Communication error
Temperature and humidity sensor is not well connected or is
damaged
Compressor stops operation,
and the fan stops operation
after 30S
1. Heat exchanger is too dirty/blocks the air inlet/outlet;
2. Compressor operation is abnormal, strange noise or leakage
occurs. Temperature of outer casing is too high;
3. The internal system is blocked (dirt blockage and ice blockage);
4. The pipeline is fractured or rusted, and the refrigerant is leaked.
Flash Full water protection Compressor stops operation,
and the fan stops operation
after 3min
The structure of water tank is abnormal, or component on liquid
level switch is abnormal;
See Page 31 “Troubleshooting on full water protection”
Overload protection Compressor stops operation,
and the fan stops operation
after 30S
1. Heat exchanger is too dirty/blocks the air inlet/outlet;
2. The rotate speed of motor is abnormal, rotate speed is too low
or the fan is not operating;
3. Compressor operation is abnormal; strange noise or leakage
occurs. Temperature of outer casing is too high;
4. The internal system is blocked (dirt blockage and ice blockage);
5. Pipeline is fractured or rusted, refrigerant is leaking;
6. Applied in poor condition of high temperature and high humidity.
7. Main board is damaged.
Water pump error Compressor and water pump
stops operation, the fan stops
after 3min
Water pump is damaged or component on liquid level switch is
abnormal
See Page 32 “Water pump protection error”
Discharge temperature protection Compressor stops operation,
and the fan stops operation
after 30S
1. Heat exchanger is too dirty/blocks the air inlet/outlet;
2. The rotate speed of motor is abnormal, rotate speed is too low
or the fan is not operating;
3. Compressor operation is abnormal; strange noise or leakage
occurs. Temperature of outer casing is too high;
4. The internal system is blocked (dirt blockage and ice blockage);
5. Pipeline is fractured or rusted, refrigerant is leaking;
6. Applied in poor condition of high temperature and high humidity.
7. Main board is damaged.

9
Flow Chart of Troubleshooting for Main Malfunctions
1. Troubleshooting for jumper cap
Main check points:
(1) jumper cap (2) control board of indoor unit
N
Y
N
Y
Y
N
NY
N
Y
Display shows “C5”
Check whether the main
board of controller is inserted with
jumper cap.
Insert the equipped
jumper cap
Insert the jump cap
tightly again
Check whether the
jumper cap is not inserted
well.
Replace the jumper
cap with a new one
Eliminate
malfunction
Eliminate
malfunction
Eliminate
malfunction
It's the malfunction of
main board. Replace
the main board with
the a new one.
End

10
2. Communication malfunction
2.1 Communication error of indoor and outdoor unit
Main check points:
(1) Connection wire between indoor unit and outdoor unit
(2) Wiring inside the unit
(3) Communication circuit of control board of indoor unit
(4) Communication circuit of control board of outdoor unit
Y
N
Y
N
N
Y
N
N
Y
N
Y
N
Y
Y
Check whether the
unit has operated normally before
the malfunction occurs.
Check the connection wire of
indoor unit and outdoor unit
according to the wiring diagram.
Check whether the connection
wire of controller inside the
electric box of indoor/outdoor
unit is loose.
Is the
connection correct?
Connect the connection
wire of indoor/outdoor unit
correctly according to the
wiring diagram.
Connect the connection wire of
indoor/outdoor unit correctly
according to the wiring diagram.
Is the connection
wire of electric box is
normal?
Check the communication
circuit of outdoor unit
Is there's problem
for the communication
circuit?
Replace the control
board of outdoor unit.
Replace the control board
of indoor unit.
Start
End
Eliminate
malfunction
Eliminate
malfunction
Eliminate
malfunction
Note: method for checking the communication circuit of inverter split type and floor standing unit: cut off the
communication wires of indoor/outdoor unit, and then measure the voltage between COM and N of the control board
of outdoor unit (DC notch, about 56V)

11
2.2 Communication error between wired controller and indoor unit
Main check points:
(1) Connection wire of wired controller
(2) Wiring terminal
(3) Wired controller
(4) Main board of indoor unit
N
N
Y
Y
Check whether the
connection wire of wired controller
and main board of the indoor
unit is loose.
Replace with a new controller
with the same model for indoor
unit
Eliminate
malfunction
Replace the
wired controller
Connect the wired controller and
indoor unit correctly according to
the circuit diagram firmly
Start
End
Eliminate
malfunction
Y

12
3. IPM protection , over-phase current of compressor
Main check points:
(1) compressor COMP terminal (2) power supply voltage (3) compressor
(4) charging amount of refrigerant (5) air inlet and air outlet of indoor/outdoor unit
NOTE:The control board as below means the control board of outdoor unit.
Y
Y
Y
Y
Y
Y
Y
N
N
N
N
N
N
N
Y
Put through the
power and turn
on the unit
IPM occurs when
the unit has operated for a
period of time.
Check the connection between
the control board and the
compressor according to the
electric wiring diagram.
Check whether the
compressor wire (UVW) is connected
and the connection sequence
is correct.
Measure the voltage of terminal
L and terminal N of wiring board
with AC voltmeter.
Connect the compressor wires
correctly according to the electric
wiring diagram, and then put
through the power and then turn
on the unit
Measure the resistance among
three terminals (UVW) with the
resistance measuring meter.
Check the power supply
voltage and make it resume
to the range of ±10% of
rated voltage.
Is the voltage between
terminal L and terminal N of XT in the
range of ±10% of rated
voltage?
1.Check whether the heat exchanger of indoor/outdoor unit is dirty and whether the
heat exchanger is covered by foreign object
2.Check whether the indoor fan and the outdoor fan operate normally;
3.Check whether the system pressure is too high;
4.Check whether the pressure is too high because there are too much refrigerant;
Is the resistance value
for the three terminals of compressor
are almost the same?
Is the resistance
more than 500M
Measure the resistance among
three terminals (UVW) and the
copper pipe with the resistance
measuring meter.
Are there abnormal
circumstances described
as above?
Correct them basing on
the Service Manual and
then put through the
power and then turn on
the unit. Replace the compressor
Does the unit operate normally?
Replace the control
board
End

13
4. Overload protection of compressor , high discharge temperature
protection of compressor
4.1 Overload protection of compressor, high discharge temperature protection of
compressor (split type and oor standing unit)
Main check points:
(1) electronic expansion valve (2) expansion valve terminal
(3) charging amount of refrigerant (4) overload protector
NOTE:The control board as below means the control board of outdoor unit.
Y
N
N
N
N
Y
Y
N
Y
Y
After the unit has been
cut off the power for more
than 20mins
Check whether the
overload protector SAT is connected.
Connect the wires well
according to the wiring
diagram.
Under the ambient temperature,
use the ohmmeter to measure the resistance of
overload protector. Is the resistance
less than 1000ohm?
Check whether the wiring
terminal FA of electronic expansion valve is
connected well.
Replace overload protector SAT.
The resistance between the first four leading
feet closing to the terminal hole and the fifth
leading feet are almost the same respectively
and they are all less than 100ohm.
Replace the coil of electronic
expansion valve EKV.
Eliminate malfunction
Check whether the refrigerant is
leaking; if yes, please charge the
refrigerant according to the
technical specification.
Eliminate malfunction
Replace control board
End

14
4.2 Overload protection (window type, TTW, PTAC, portable type, recreational vehicle AC and
dehumidier)
Main check points:
(1) Compressor (2) Refrigerant
(3) Whether the air inlet/outlet, heat exchanger and internal system is dirty and blocked
(4) Fan (5) Main board
Start
Clean the heat exchanger
and remove the plugs
Check the fan, re-install
the fan to make it function
normally
Find out the leakage point to supplement
welding or replace the broken component,
conduct vacuuming and perfusion again
Check if there are any shelters near
the condenser, if yes, take them away;
check the component with abnormal
sound, replace the faulted component;
if the refrigerant is leaking, find out the
leakage point and supplement the welding
process or replace the broken component,
conduct vacuuming and perfusion
If the capillary keeps defrosting, replace the
capillary component, conduct vacuuming
and perfusion; if the 4-way valve conducting
heating with heat pump has no reversing,
then replace the solenoid valve or 4-way
valve
Heat exchanger is too dirty,
or blocks the air inlet/outlet?
The rotate speed of fan
is abnormal, rotate speed is too low or
the fan is not functioning;
Refrigerant leakage leads to
overheat protection of compressor
Is the internal system
blocked (dirt blockage, ice blockage,
oil blockage, the 4-way valve is not
completely opened)?
Is compressor
operation abnormal? Does strange
noise or leakage occur? Is temperature
of outer casing too high?
Eliminate
malfunction
Eliminate
malfunction
Eliminate
malfunction
Eliminate
malfunction
End
Replace with a new controller
with the same model
Eliminate
malfunction

15
Start
Insert the temperature
sensor well
Check whether the
connection terminal between the
temperature sensor and the control board is
loose or not connected
well.
Eliminate
the malfunction
Eliminate
the malfunction
Eliminate
the malfunction
Check whether there
is short circuit caused by
the tripped-over elements on the
control board.
Pull the elements uprightly
Replace the temperature
sensor with another one
with the same model
Check whether the
resistance of temperature sensor is
normal by referring to the
resistance table.
Replace the controller with
a new one with the same
model
End
5.Troubleshooting for temperature sensor , , , ,
5.1Temperature sensor error
Main check points:
(1) connection terminal (2) temperature sensor (3) main board
Troubleshooting for Temperature and humidity sensor ,

16
Start
Check whether
there is short circuit caused by the
tripped-over elements on the
control board
Check if the
connection terminal between the
inspection board and control board
is loose or not connected
well
Replace with a new controller
with the same model
End
Insert the inspection
board
Eliminate
malfunction
Put the elements
uprightly
Eliminate
malfunction
Y
Y
N
NY
Y
Replace the inspection
board with the same model
N
N
N
Y
Eliminate
malfunction
5.2 Malfunction of temperature and humidity sensor (dehumidier)
Main check points:
(1) connection terminal (2) inspection board (3) control board

17
6.High temperature prevention protection ; high power ; system is
abnormal
6.1 High temperature, overload, high power and abnormal system
Main check points:
(1) outdoor temperature (2) fan (3)air inlet and air outlet of indoor/outdoor unit
NOTE:The control board as below means the control board of outdoor unit.
Y
N
Y
N
Y
N
Overload protection,
high temperature
prevention protection
Is the outdoor ambient temperature
higher than 53℃？
Normal protection. Please operate
it when the outdoor ambient
temperature is improved.
After the complete unit is disconnected
from the power for 20mins
Is the radiation of indoor unit
and outdoor unit is not good?
Improve the unit's
radiation environment.
Check whether the fan terminal
OFAN is connected well
Measure any two
terminal with the ohmmeter and resistance
is less than 1,000ohm.
Check whether the outdoor
fan operates normally?
Replace the fan capacitor C1
Replace the outdoor fan
Replace the control board
End

18
6.2 Overload (window type, TTW, PTAC, portable type and recreational vehicle AC)
Main check points：
(1) compressor (2) refrigerant (3) air inlet/outlet, heat exchanger and internal system is dirty and blocked
(4) fan (5) operation environment
Start
Compressor
operation is abnormal, strange
noise or leakage occurs. Temperature
of outer casing is
too high
The rotate speed
of fan is abnormal, rotate speed is
too low or the fan is not
functioning
Is the internal system
blocked (dirt blockage, ice blockage,
oil blockage, the 4-way valve is not
completely opened)?
Replace with a new controller with the same model
End
Check the fan, re-install
the fan to make it operate
normally;
Check if there are any shelters near the condenser, if yes,
take them away; check the component with abnormal sound,
replace the faulted component; if the refrigerant is leaking,
find out the leakage point and supplement the welding process
or replace the broken component, conduct vacuuming and
perfusion
If the capillary keeps defrosting, replace the capillary
component, conduct vacuuming and perfusion; if the 4-way
valve conducting heating with heat pump has no reversing,
then replace the solenoid valve or 4-way valve
Y
Y
Y
N
N
N
N
N
Is the heat exchanger
too dirty, or does it block the
air inlet/outlet?
Clean the heat exchanger
and remove the plugs
Y
Is the temperature
sensor of outer tube on the main
board normal?
Y
N
Replace the temperature sensor
N Y
Y
Y
Y
Y
Y
Operation
environment is
bad
N
N
The air conditioner should
operate under low ambient
temperature and humidity
Eliminate malfunction?
Eliminate malfunction?
Eliminate malfunction?
Y
N
Eliminate malfunction?
Eliminate malfunction?
Eliminate malfunction?
N
N

19
7.Desynchronization diagnosis for compressor
Main check point:
(1) system pressure (2) power supply voltage
NOTE:The control board as below means the control board of outdoor unit.
Y
N
N
N
Y
Y
N
Y
N
N
Y
N
Y
Y
N
Y
Desynchronization occurs
during operation
Check whether the fan
terminal OFAN is
connected well.
Desynchronization occurs
after turning on the unit
Replace the fan
capacity C1.
Does the outdoor fan operate
normally?
Check whether the compressor
has stopped operation for more
than 3mins.
Improve the radiation of the
unit (such as clean the heat
exchanger, strengthen the
ventilation, etc.) .
Replace the outdoor fan
Is the radiation for the unit
not good?
Turn on the unit when the
power has resumed to the
normal range.
Check whether
the compressor wire (UVW) is
connected well and the connection
sequence is the clockwise
direction.
Is the input voltage of the
unit normal?
Connect the wires
Replace the control board
Charge the refrigerant
according the Service
Manual.
Is the refrigerant too much?
Replace the control board
Replace the compressor
End
End
Replace the compressor
Eliminate
malfunction
Eliminate
malfunction