8.1 Indoor unit error code explanation:
Glory series
8 IPM module protection or IGBT over-strong current protection X X O★
9 Over voltage or too low voltage protection X O O
★
10 Temperature protection of compressor top O X X
★
11 Inverter compressor drive protection O X
★ ★
12 Mode conflict X O
★ ★
★Flash(at 0.5Hz, Mode conflict at 0.25Hz) O light X（off）
9V series+VERTU series+9A series+Corona series+ R series+Y series+ X series
Display LED STATUSE0 Indoor EEPROM malfunction
E1 Indoor/ outdoor units communication error E2 Zero-crossing signal error
E3 Indoor fan speed has been out of control
E5 Open circuit or short circuit of outdoor temperature sensor E6 Open circuit or short circuit of T1 or T2 temperature sensor P0 IPM module protection or IGBT over-strong current protection P1 Over voltage or too low voltage protection
P2 Temperature protection of compressor top P4 Inverter compressor drive protection
P5 Mode conflict
NEOLA series +PREMIER series +OASIS series:
Display Operation lamp flash times Timer lamp Failure
E0 1 X Indoor EEPROM malfunction
E1 2 X Indoor / outdoor units communication error
E2 3 X Zero-crossing signal error
E3 4 X Indoor fan speed has been out of control
E4 5 X Open or short circuit of T1 temperature sensor
E5 6 X Open or short circuit of T2 temperature sensor
F1 2 O Open or short circuit of T4 temperature sensor
F2 3 O Open or short circuit of T3 temperature sensor
F3 4 O Open or short circuit of T5 temperature sensor
F4 5 O Outdoor EEPROM malfunction
F6 7 O Open or short circuit of T2B temperature sensor
P0 1 ☆ IPM module protection or IGBT over-strong current
protection
P1 2 ☆ Over voltage or too low voltage protection
P2 3 ☆ Temperature protection of compressor top
P4 5 ☆ Inverter compressor drive protection
P5 6 ☆ Mode conflict
O （light） X （off） ☆ （flash）
Cassette series:
Operation Timer De-frost Alarm LED STATUS
★
X X X Open or short circuit of T1 temperature sensor★ ★ ★ ★
Temperature protection of compressor top★
X Mode conflict★
X Inverter compressor drive protection★ flash, light, X extinguished.
Ceiling &Floor series:
Operation Timer De-frost Alarm LED STATUS
★
X X X Open or short circuit of T1 temperature sensorA5 Duct series:
Operation Timer De-frost Alarm LED STATUS DISPLAY DIGITAL TUBE
★
X X X Open or short circuit of T1 temperature sensor E0★ ★ ★ ★
Temperature protection of compressor top P3★
◎ X X Inverter compressor drive protection P4★
X X Mode conflict P5★ flash at 5Hz, light, X extinguished ◎ flash at 0.5Hz
Console series:
Operation Timer De-frost LED STATUS
★
X X Open or short circuit of T1 temperature sensorX X
★
Open or short circuit of T2 temperature sensorX
★
X Indoor / outdoor units communication error★ ★
X Indoor EEPROM malfunction★
X★
IPM module protection★ ★ ★
Open or short circuit of T3 or T4 temperature sensor★
X Top temperature protection of compressor★
◎ X Inverter compressor drive protection★
X Mode conflict★
★
Indoor fan speed has been out of control★ flash at 5Hz, light, X extinguished
Outdoor unit error code explanation:
For units(except M5OA-36HRDN1-Q model)
Display LED STATUS
E0 Outdoor EEPROM malfunction
E1 No A Indoor unit coil outlet temp. sensor or connector of sensor is defective E2 No B Indoor unit coil outlet temp. sensor or connector of sensor is defective E3 No C Indoor unit coil outlet temp. sensor or connector of sensor is defective
E6 No D Indoor unit coil outlet temp. sensor or connector of sensor is defective E4 Open or short circuit of outdoor unit temperature sensor
E5 Compressor voltage protection
E7 Communication malfunction between IPM board and outdoor main board
P0
Temperature protection of compressor discharge or compressor top.
For M4OC-27HRDN1, M4OC1-27HRDN1-Q,
M4OC-36HRDN1-Q
,it only means Temperature protection of compressor dischargeP1 High pressure protection(only for M4OC1-27HRDN1-Q, M4OC-27HRDN1-Q,M4OC-36HRDN1-Q)
P2 Low pressure protection(only for M4OC1-27HRDN1-Q, M4OC-27HRDN1-Q,M4OC-36HRDN1-Q) P3 Current protection of compressor
P4 IPM module protection
P6 High temperature protection of condenser
P7 Inverter compressor drive protection
For M5OA-36HRDN1-Q model
Display LED STATUS
E0 Outdoor EEPROM malfunction
E2 Indoor / outdoor units communication error
E3 Communication malfunction between IPM board and outdoor main board
E4 Open or short circuit of outdoor unit temperature sensor E5 Compressor voltage protection
E6 PFC module protection
F1 No A Indoor unit coil outlet temp. sensor or connector of sensor is defective
F2 No B Indoor unit coil outlet temp. sensor or connector of sensor is defective F3 No C Indoor unit coil outlet temp. sensor or connector of sensor is defective F4 No D Indoor unit coil outlet temp. sensor or connector of sensor is defective F5 No E Indoor unit coil outlet temp. sensor or connector of sensor is defective
P1 High pressure protection P2 Low pressure protection
P3 Current protection of compressor
P4 Temperature protection of compressor discharge
P5 High temperature protection of condenser P6 IPM module protection
8.3Trouble shooting
8.3.1 For the indoor unit
8.3.1.1 Indoor EEPROM malfunction
8.3.1.2 Indoor / outdoor units communication error
Reconnect the wiring Check wiring on the outdoor
and indoor terminal follow the wiring diagram. Is all connecting correctly?
Turn on all indoor unit by remote controller. Is all indoor unit display
Measure Vs, is it moving alternately between positive value and negative value?
(Vs is the voltage between S and L2). Refer PIC 1
Turn off the all indoor units. Is IPM power LED lamp On? Refer PIC 3
Reconnect the wiring
No
A:
Is all the wiring between terminal and Indoor PCBReconnect the wiring
Change Outdoor Main
No second time
A
Yes Yes
Pic 1:
Measure the voltage of L2 to S (Vs), is it moving alternately between positive value and negative value?PIC 2, Check the wiring.
PFC (qua-zone only) PIC 3:IPM
(For dual/tri/qua-zone)
Power on Self-Check OK
Operati
Off is OK
PIC4 :Main board LED when power on and unit standby.
PIC 5: check piont buttom,
pess 18 times for check how many indoor units are connected.
8.3.1.3 Zero-crossing signal error
8.3.1.4 Indoor fan speed has been out of control
Shut off the power supply and turn it on 1 minute later. Is it still displaying
the error code?
S h u t o f f t h e p o w e r su pply , rotate the cross fan by hand. Does it rotate properly?
The unit operates normally.
Disassembly the connection between fan and motor, check if the bearing is normal?
Replace the bearing.
Check the wires of fan motor. Are all the
connections good?
No
Yes
No No
Replace indoor fan motor.
Yes
Check the resistance value of indoor fan motor, is it normal?
Replace indoor PCB.
Yes
8.3.1.5 Open or short circuit of temperature sensor.
8.3.1.6 Full-water malfunction
Full-water malfunctionCheck whether the water-level switch is inserted well
Check whether the water-level switch is broken
Check PCB board or replace the indoor main PCB
Replace the water-level switch Yes
No
Check whether the water pump is normal
Yes
Insert the water-level switch well No
Yes
Replace the water pump No
8.3.2 For the outdoor unit
8.3.2 1 Outdoor EEPROM malfunction
Outdoor EEPROM malfunction
Yes
No Insert the EEPROM well
Replace the outdoor main board If the EEPROM chip is welded on PCB, replace the PCB directly.
Otherwise, check whether the EEPROM chip plugged in PCB well?
8.3.2.2 Voltage protection of compressor
Check the power supply No
Check the voltage of outdoor unit power supply, whether the voltage between L(1) and N is about 220VAC
No
Replace the power board, then check whether the system can run normally
Yes
Yes
Trouble is solved
No
Check whether the voltage of IPM board P and N is 280-400VDC
Replace bridge rectifiers, then check whether the
system can run normally
Trouble is solved
Replace IPM board No
Yes
No
No Replace outdoor main board
Voltage protection of compressor
8.3.2.3 Communication malfunction between IPM board and outdoor main board
Check whether the IPM board has error display Yes Replace IPM board No
Insert the connecting wiring between the IPM module and the main board well over again
Trouble is solved Yes
No
Replace the IPM board No
Trouble is solved Yes
No
Replace outdoor PCB
Replace the electric control box
Trouble is solved Yes
The problem is not
resolved.
8.3.2.4 Temperature protection of compressor discharge
Discharge temperature protection of compressor
Check whether the compressor discharge temp. is more than 115°C ?
No
Check whether the wiring connection is right between compressor discharge temp. sensor and
PCB according to wiring diagrams
Yes
Method: Check whether the resistance of compressor discharge temp. sensor is right refer to the Appendix 2
No
Correct the wiring connection
Yes
Replace outdoor main board Judge: The discharge temp. sensor is broken
No
Replace the compressor discharge temp. sensor Check whether the refrigerant is leak
Stop leaking and add refrigerant Yes Yes
8.3.2.5 Temperature protection of compressor top
Judge 2: Whether refrigerant circulation volume is normal?
Whether abnormality is the same after gas charging?
Check refrigerant system (such as clogging of capillary etc.) Temperature protection of compressor top
Judge 1: Whether compressor operates?
Yes
No
Whether the connection is good?
Method: Charge refrigerant
Yes
Whether protector is normal?
Replace the protector.
No
8.3.2.6 High pressure protection(For M4OC1-27HRDN1-Q, M4OC-27HRDN1-Q,M4OC-36HRDN1-Q, M5OA-36HRDN1-Q)
High pressure protection
Judge 1: Whether the wiring between the high pressure switch and main control board is connected well or correctly
Judge 2: Whether the high pressure switch is broken Yes
No
Connect it well
Method: Short connect the high pressure switch socket, check whether the system can run normally
Yes
Replace high pressure switch
No
Check whether the refrigerant system is ok
Replace outdoor main board No
Judge 3: Check whether the outdoor ambient temperature is too high
Yes
Stop the unit
No
Judge 4: Check whether the outdoor unit is bad ventilation
Yes
Make the outdoor unit ventilate well
No
Judge 5: Check whether the heat exchanger is dirty
Yes
Clean the heat exchanger
No
Judge 6: Check whether the refrigerant pipe is blocked
Yes Let the refrigerant out, then use the high pressure nitrogen or refrigerant to blow pipe, vacuumize and
charge the refrigerant again
8.3.2.7 Low pressure protection (For M4OC1-27HRDN1-Q, M4OC-27HRDN1-Q,M4OC-36HRDN1-Q, M5OA-36HRDN1-Q)
Low pressure protection
Judge 1: The wiring between the low pressure switch and main control board is connected well or correctly
Judge 2: Whether the low pressure switch is broken
Connect it well
Method: Short connect the low pressure switch socket, check whether the system can run normally
Check whether the refrigerant system is ok Yes
No
Judge 3: Check whether the outdoor ambient temperature is too low Yes
Stop the unit
No
Judge 4: The refrigerant of the system is leakage
Method: Connect the pressure gauge to the gauge joint of the system, Yes check whether the pressure is lower than 0.14MPa
Leak hunting: Charge nitrogen or refrigerant to the system, if the leakage is serious, there will be distinct gas leakage “cici” sound; if the leakage is slight, use the suds (mixture of water and abluent is also ok if it can make bubble) or electronic leak detector.
Judge 5: The refrigerant pipe is blocked
Yes Let the refrigerant out, then use the high pressure nitrogen or refrigerant to blow pipe, vacuumize and
charge the refrigerant again No
Replace outdoor main board No
No
Yes
Replace low pressure switch
8.3.2.8 Current protection of compressor
Current protection of compressor
Judge 1: Check whether the input current of the power supply wire is more than 8.5A (For 18-21K, it is 15A..For 27K(1x3) , it is 15A .For 27K(1x4), it is
18.5A , For 36K, it is 21.5A)
Check whether the refrigerant system is ok Yes
Judge 2: Check whether the outdoor ambient temperature is too high Yes
Stop the unit
Replace outdoor main board No
No
Judge 3: Check whether the outdoor unit is bad ventilation
Yes
Make the outdoor unit ventilate well
No
Judge 4: Check whether the heat exchanger is dirty
Yes
Clean the heat exchanger
No
Judge 5: The refrigerant pipe is blocked
Yes Let the refrigerant out, then use the high pressure nitrogen or refrigerant to blow pipe, vacuumize and
charge the refrigerant again
Replace the electric control box
Trouble is solved Yes
The problem is not
resolved.
8.3.2.9 IPM module protection
IPM module protection
Check whether the voltage range of P-N on IPM module is normal? DC277-356V for 14-27KBtu/h; DC277-410V for 36KBtu/h
No Check whether the input power supply is correct? 220-240V, 1N, 50Hz
No
Regulate it to correct, then check whether the
system can work normally?
Yes
Check whether the power supply line is connected
correctly and tightly
No Connect it correctly and tightly, check ok or not?
No
Yes
Check whether the lines in E-part box are connected tightly
No Connect it tightly, check ok or not?
No
Yes
Check whether the single-phase bridge is normal? Use the multimeter to measure the resistance between each two terminals, check
whether there is the condition that value of resistance is 0
Yes Replace the single-phase bridge
No
No
Check whether the connecting line of every reactor is normal? If the line is broken, the resistance of the
two ports is ∞（models except for M5OA-36HRDN1-Q）；Check
whether the PFC module broken(for M5OA-36HRDN1-Q)
Yes Replace the connecting line or reactor or replace the PFC module Yes
Check whether the connecting line between main board and the IPM
module is connected tightly
Yes
Check whether the connecting line of the compressor is connected correctly or tightly
Yes
Replace the IPM module, check whether the system can work
normally?
No
Replace the main board, check whether the system can work
normally? Yes Trouble is solved
Replace the compressor, check whether the system can work
normally?
Connect it tightly, check ok or not?
No
No
Yes
Trouble is solved No
No
Yes Trouble is solved Connect it well, check ok or not?
8.3.2.10 High temperature protection of condenser
When outdoor pipe temp. is more than 65°C, the unit will stop, and unit runs again when outdoor pipe temp. less than 52°C.
Check whether the condenser temperature is more than 65°C
Check whether the resistance of condenser temp.
sensor is correct refer to the Appendix 1
Replace outdoor main board
Let the refrigerant out, then use the high pressure nitrogen or refrigerant to blow pipe, vacuumize and
charge the refrigerant again
High temperature protection of condenser
No
Yes
No Replace the temperature sensor Yes
Judge1: The outdoor temp. is too high
No
Judge 2: Check whether the heat exchanger is dirty
No
Judge 3: The refrigerant pipe is blocked Clean the heat exchanger
Yes
Yes Yes Stop the unit
No
8.3.2.11 PFC module protection
8.3.2.12 Inverter compressor drive protection
The trouble shooting is same with one of IPM module protection
PFC module protectionCheck whether the connecting line between main board and the PFC module is connected tightly
No
Connect it tightly, check normal or not
Yes
Check whether the voltage between P and N of IPM module is 380-390VDC
No
Yes
Replace the outdoor main board
No
Replace the PFC module Yes
Check whether the inductance of PFC module is good?
Replace the inductance No
Appendix 1 Temperature Sensor Resistance Value Table (℃--K)