SD Power abnormal detection
EH 00 Indoor EEPROM malfunction
EL 01 Communication malfunction between indoor and outdoor units
EH 02 Zero-crossing signal detection error Result 1 of 2 with this code and meaning. Expand for model and series details.
EH 03 Indoor fan speed is outside the normal range Result 1 of 2 with this code and meaning. Expand for model and series details.
EC 51 Outdoor EEPROM parameter error
EC 52 Condenser coil temperature sensor T3 is open circuit or short circuit
EC 53 Outdoor ambient temperature sensor T4 is open circuit or short circuit
EC 54 Compressor discharge temperature sensor TP is open circuit or short circuit
EH 60 Indoor room temperature sensor T1 is open circuit or short circuit
EH 61 Evaporator coil middle temperature sensor T2 is open circuit or short circuit
EC 07 Outdoor fan speed is outside the normal range Result 1 of 2 with this code and meaning. Expand for model and series details.
EH 0b Communication error between indoor PCB and display PCB
EL 0C Refrigerant leakage detection or system lacks refrigerant
PC 00 IPM malfunction or IGBT over-current protection
PC 01 Outdoor unit voltage protection, low or high voltage
PC 02 Compressor discharge temperature protection, IPM module protection, or high-pressure protection
PC 04 Inverter compressor drive error
PC 40 Communication error between outdoor main chip and compressor driven chip
PC 03 High-pressure protection or low-pressure protection
PC 08 Current overload protection
FH 0P AP mode is active but there is no Wi-Fi kit installed
E0 Indoor EEPROM parameter error
E1 Indoor-outdoor communication error
E2 Zero-crossing signal detection error
E3 Indoor fan speed is outside the normal range
E4 Indoor room temperature sensor T1 is open or shorted
E5 Evaporator coil temperature sensor T2 is open or shorted
E7 Display board and indoor PCB communication error
EC Refrigerant leakage detection
F2 Outdoor condenser coil sensor T3 is open or shorted on selected models
F5 Outdoor fan speed is outside the normal range on selected models
P6 High-pressure protection on selected models
EH 00 / EH 0A Indoor unit EEPROM parameter error
EL 01 Indoor-outdoor unit communication error
EH 02 Zero-crossing signal detection error Result 2 of 2 with this code and meaning. Expand for model and series details.
EH 30 Indoor external fan low-voltage protection
EH 31 Indoor external fan over-voltage protection
EH 03 Indoor fan speed is outside the normal range Result 2 of 2 with this code and meaning. Expand for model and series details.
EC 51 Outdoor unit EEPROM parameter error
EC 52 Condenser coil temperature sensor T3 is open circuit or short circuited
EC 53 Outdoor room temperature sensor T4 is open circuit or short circuited
EH 60 Indoor room temperature sensor T1 is open circuit or short circuited
EH 61 Evaporator coil temperature sensor T2 is open circuit or short circuited
EC 07 Outdoor fan speed is outside the normal range Result 2 of 2 with this code and meaning. Expand for model and series details.
EH 0b Indoor PCB and display-board communication error
EL 0C Refrigerant leak detected
PC 10 Low-voltage protection
PC 11 Over-voltage protection
PC 12 DC voltage protection
PC 02 Compressor top high-temperature protection
PC 03 Pressure protection
PC 41 Current input detection protection
PC 42 Compressor start error
PC 43 Phase-loss protection
PC 44 Compressor no-speed protection
PC 46 Compressor speed malfunction
PC 0A Condenser high-temperature protection
PC 08 Outdoor current protection
PC 0L Outdoor ambient temperature too low protection
PH 09 Anti-cold-air protection in heating mode
PH 90 Evaporator coil temperature too high protection
PH 91 Evaporator coil temperature too low protection
E1 Room temperature sensor issue
E2 Evaporator temperature sensor issue
E3 Condenser temperature sensor issue on selected portable models
E4 Display panel communication issue
P1 Bottom tray is full
A01 Emergency stop is active
xA61 Slave outdoor unit at address x has an address error
AAx Inverter module board x does not match the main PCB
xb53 Cooling fan x has failed
C13 An outdoor-unit address is duplicated
C21 Indoor-unit to master-unit communication has failed
C26 The master detects fewer indoor units than configured
C28 The master detects more indoor units than configured
xC31 Communication with slave outdoor unit address x has failed
C32 The master detects fewer slave outdoor units
C33 The master detects more slave outdoor units
xC41 Main-control to inverter-driver chip communication has failed for address x
E41 Outdoor ambient temperature sensor T4 is open or shorted
F31 Plate heat-exchanger cooling inlet sensor T6B is open or shorted
F41 Outdoor heat-exchanger temperature sensor T3 is open or shorted
F51 Plate heat-exchanger cooling inlet sensor T6A is open or shorted
F62 Inverter module temperature NTC protection is active
F63 Non-inductance resistance temperature Tr protection is active
F6A F62 protection occurred five times within 100 minutes
F71 Discharge temperature sensor T7C is open or shorted
F72 Discharge temperature T7C protection is active
F75 Compressor discharge superheat is insufficient
F7A F72 protection occurred three times within 100 minutes
F81 Gas stop-valve temperature sensor Tg is open or shorted
F91 Liquid-pipe temperature sensor T5 is open or shorted
FA1 Outdoor heat-exchanger inlet sensor T8 is open or shorted
FC1 Outdoor heat-exchanger outlet sensor TL is open or shorted
Fd1 Compressor suction temperature sensor T7 is open or shorted
FL1 Outdoor ambient temperature sensor T10 is open or shorted
P11 The high-pressure sensor has failed
P12 Discharge-pipe high-pressure protection is active
P13 The discharge-pipe high-pressure switch has operated
P14 P12 occurred three times within 60 minutes
P21 The low-pressure sensor has failed
P22 Suction-pipe low-pressure protection is active
P24 Suction-pipe pressure rose abnormally
P25 P22 occurred three times within 100 minutes
xP32 Compressor x has high DC-bus current protection
xP33 xP32 occurred ten times within 100 minutes
P51 High AC-voltage protection is active
P52 Low AC-voltage protection is active
P53 Power-cable phase B and neutral are connected in reverse
P54 DC-bus low-voltage protection is active
P55 DC-bus ripple protection is active
xP56 Inverter module x reports low DC-bus voltage
xP57 Inverter module x reports high DC-bus voltage
xP58 Inverter module x reports excessively high DC-bus voltage
P71 The EEPROM has failed
Pb1 HyperLink overcurrent was detected
Pd1 Anti-condensation protection is active
Pd2 Pd1 occurred twice within 60 minutes
1b01 Electronic expansion valve EEVA has failed
2b01 Electronic expansion valve EEVB has failed
3b01 Electronic expansion valve EEVC has failed
4b01 Electronic expansion valve EEVE has failed
bA1 HyperLink cannot control an indoor unit electronic expansion valve
U11 The outdoor-unit type setting is incorrect
U12 The capacity setting is incorrect
U21 First-generation indoor units are present or indoor addresses are duplicated
U22 The system contains only a hydraulic-module indoor unit
U23 Common indoor units and a constant-temperature/humidity modular AHU are mixed
U24 Common indoor units and a reheat fresh-air modular AHU are mixed
U25 A non-common indoor unit is connected
U26 Indoor and outdoor units are mismatched
U31 No test run was completed, or the test run was unsuccessful
U32 Outdoor temperature is outside the commissioning range
U33 Indoor temperature is outside the commissioning range
U34 Outdoor and indoor temperatures are outside the commissioning range
U35 The liquid-side stop valve is closed
U37 The gas-side stop valve is closed
U38 No system address is assigned
U3A The communication cable is connected incorrectly Result 1 of 2 with this code and meaning. Expand for model and series details.
U3b The installation environment is abnormal Result 1 of 2 with this code and meaning. Expand for model and series details.
U3C Auto mode reports a configuration error
U41 Common indoor-unit capacity exceeds the permitted connection range
U42 Fresh Air Processing indoor-unit capacity exceeds the permitted connection range
U43 Discharge-air-control AHU kit capacity is outside the permitted range
U44 Return-air-control AHU kit capacity is outside the permitted range
U45 Constant-temperature/humidity modular AHU combination ratio is out of range
U46 Reheat fresh-air modular AHU combination ratio is out of range
U48 Total indoor-unit capacity is outside the permitted connection range
U51 More than one outdoor unit was detected in an individual VRF system
U53 Different outdoor-unit series were detected in the same VRF system
U54 At least one MS is connected to a heat-pump outdoor unit
1L01 A 1L1* or 1L2* driver error occurred five times within 60 minutes
1L11 Compressor-driver software overcurrent
1L12 Compressor-driver software overcurrent lasted 30 seconds
1L1E Compressor-driver hardware overcurrent
1L2E Compressor-driver module overtemperature
1L33 Compressor-driver bus voltage dropped
1L43 Compressor-driver current-sampling bias is abnormal
1L45 The compressor motor code does not match
1L46 Compressor-driver IPM protection FO is active
1L47 The compressor-driver module type does not match
1L4E The compressor-driver EEPROM has failed
1L51 The compressor motor is out of step
1L52 Compressor locked-rotor protection is active
1L5E The compressor failed to start
1L65 The compressor-driver IPM is short-circuited
1L66 The compressor-driver FCT test failed
1L6E Compressor motor phase-loss protection is active
1L71 The U-phase upper driver is open-circuited
1L76 The W-phase lower driver is open-circuited
1LB7 The compressor driver reports another check exception
1LBE The compressor-driver high-voltage switch operated
1LBF The compressor-driver software certification module failed
xJ01 Fan driver x reports ten xJ1* or xJ2* errors within 60 minutes
xJ11 Fan-driver x software overcurrent
xJ12 Fan-driver x software overcurrent lasted 30 seconds
xJ1E Fan-driver x hardware overcurrent
xJ2E Fan-driver x inverter module is too hot
xJ33 Fan-driver x bus voltage dropped
xJ43 Fan-driver x current-sampling bias is abnormal
xJ4E Fan-driver x EEPROM has failed
xJ51 Fan motor x is out of step
xJ52 Fan motor x locked-rotor protection is active
xJ5E Fan motor x failed to start
xJ6E Fan motor x phase-loss protection is active
xJBJ Fan-driver x software certification module failed
d0x Oil-return operation step x is running
dfx Defrost operation step x is running
d11 Heating is limited because outdoor temperature is above the upper limit
d12 Heating is limited because outdoor temperature is below the lower limit
d13 Cooling is limited because outdoor temperature is above the upper limit
d14 Cooling is limited because outdoor temperature is below the lower limit
d31 The refrigerant-quantity judgment has no result
d32 The refrigerant-quantity judgment is significantly excessive
d33 The refrigerant-quantity judgment is slightly excessive
d34 The refrigerant-quantity judgment is normal
d35 The refrigerant-quantity judgment is slightly insufficient
d36 The refrigerant-quantity judgment is significantly insufficient
d37 An indoor unit connected to the system is not a common type
d38 Too few connected indoor units are running
d39 Backup operation could not determine the refrigerant amount
d41 HyperLink is controlling the valve of an indoor unit without power Result 1 of 2 with this code and meaning. Expand for model and series details.
d42 Outdoor-unit to optional-board communication is unavailable
A01 Emergency stop
A11 Indoor unit refrigerant leakage
AA1 Inverter driver chip and main control chip mismatch
Ad1 Refrigerant shut-off device error
C21 Communication error between indoor and outdoor unit
C26 Number of indoor units detected by the outdoor unit has decreased
C28 Number of indoor units detected by the outdoor unit has increased
C2A Communication error between outdoor unit and refrigerant shut-off device
1C41 Communication error between main control chip and inverter driver chip
E41 Outdoor ambient temperature sensor (T4) error (open/short)
EC1 Refrigerant leakage sensor error
F31 Plate heat exchanger outlet temperature sensor (T6B) error (open/short)
F41 Outdoor heat exchanger temperature sensor (T3) error (open/short)
F62 Inverter module temperature (Tf) protection
F63 Non-inductance resistor temperature (Tr) protection
F6A F62 protection occurs 3 times in 100 minutes
F71 Discharge temperature sensor (T7C) error (open/short)
F72 Discharge temperature (T7C) protection
F75 Compressor discharge insufficient superheat protection
F7A F72 protection occurs 3 times in 100 minutes
F91 Liquid pipe temperature sensor (T5) error (open/short)
FA1 Outdoor heat exchanger inlet temperature sensor (T8) error (open/short)
FC1 Outdoor heat exchanger outlet temperature sensor (TL) error (open/short)
Fd1 Compressor suction temperature sensor (T7) error (open/short)
1L-- Compressor error; the two trailing positions identify the Table 4-5 indication
1L01 A 1L1* compressor-driver error occurs 3 times in 60 minutes
1J-- Fan motor error; the two trailing positions identify the Table 4-6 indication
1J01 A 1J1* fan-driver error occurs 10 times in 60 minutes
P11 High pressure sensor error
P12 Discharge pipe high pressure protection
P13 Discharge pipe high pressure switch protection
P21 Low pressure sensor error
P22 Suction pipe low pressure protection
P24 Suction pipe low pressure abnormal rise
P25 P22 protection occurs 3 times in 100 minutes
1P32 Compressor high DC bus current protection
1P33 1P32 protection occurs 3 times in 100 minutes
P51 High AC voltage protection
P52 Low AC voltage protection
P53 Power supply BN connection protection, missing phase, or unbalanced power at startup
P54 DC bus low voltage protection
P55 DC bus ripple protection, missing phase, or unbalanced power at startup
1P56 Inverter module DC bus low voltage error
1P57 Inverter module DC bus high voltage error
1P58 Inverter module DC bus seriously high voltage error
1P59 Inverter module busbar voltage drop protection
P71 EEPROM error
P91 PFC feedback resistance failure protection
Pb1 HyperLink overcurrent error
1b01 Electronic expansion valve (EEVA) error
3b01 Electronic expansion valve (EEVC) error
U02 Technology barrier
U11 Unit type is not set
U12 Capacity setting error
U21 Indoor unit with old platform in the system
U31 The test run is not performed or was not successful
U32 Outdoor temperature out of operating range
U33 Indoor temperature out of operating range
U34 Outdoor and indoor temperature out of operating range
U35 Liquid side stop valve is not opened
U37 Gas side stop valve is not opened
U38 No address
U3A The communication cable is connected incorrectly Result 2 of 2 with this code and meaning. Expand for model and series details.
U3b The installation environment is abnormal Result 2 of 2 with this code and meaning. Expand for model and series details.
U3C Auto mode error
U41 Common indoor unit exceeds the allowable connection range
1L1E Hardware overcurrent
1L11 Software overcurrent
1L12 Software overcurrent protection lasting 30 seconds
1L2E Inverter module high temperature protection
1L3E Low bus voltage error
1L31 High bus voltage error
1L32 Serious over voltage error of bus
1L43 Abnormal current sampling
1L45 Motor code mismatch
1L46 IPM protection
1L47 Module type mismatch
1L5E Startup failed
1L51 Stall failure
1L52 No load protection
1L6E Motor phase loss protection
1LbE High voltage switch action
1Lb7 Other check exceptions or 908 diagnosis error
1J1E Hardware overcurrent
1J11 Software overcurrent
1J12 Software overcurrent protection in the last 30 seconds
1J2E Inverter module high temperature protection
1J3E Low bus voltage error
1J31 High bus voltage error
1J32 Serious over voltage error of bus
1J43 Abnormal current sampling
1J45 Motor code mismatch
1J46 IPM protection
1J47 Module type mismatch
1J5E Startup failed
1J51 Stall failure
1J52 No load protection
1J6E Motor phase loss protection
d0x Oil return running; x represents the oil-return operation step
dfx Defrost running; x represents the defrost operation step
d11 Outdoor ambient temperature exceeds the upper limit in heating mode
d12 Outdoor ambient temperature exceeds the lower limit in heating mode
d13 Outdoor ambient temperature exceeds the upper limit in cooling mode
d14 Outdoor ambient temperature exceeds the lower limit in cooling mode
d31 Refrigerant judgment has no result
d32 Refrigerant quantity judgment is significantly excessive
d33 Refrigerant quantity judgment is slightly excessive
d34 Refrigerant quantity judgment is normal
d35 Refrigerant quantity judgment is slightly insufficient
d36 Refrigerant quantity judgment is significantly insufficient
d41 HyperLink is controlling the valve of an indoor unit without power Result 2 of 2 with this code and meaning. Expand for model and series details.
d42 Communication error between the outdoor unit and the expansion board
A01 Emergency shutdown
A11 R32 refrigerant leak requiring immediate shutdown
A51 Outdoor-unit fault
A71 Heat-recovery ventilation interlock control fault (serial application)
A72 Humidification-unit fault
A73 Heat-recovery ventilation interlock control fault (non-serial application)
A74 Secondary AHU-kit fault
A81 Self-check fault
A82 MS refrigerant-flow direction switching device fault
A91 Mode conflict
b11 EEV No. 1 coil fault
b12 EEV No. 1 valve-body fault
b13 EEV No. 2 coil fault
b14 EEV No. 2 valve-body fault
b34 Water-pump No. 1 protection
b35 Water-pump No. 2 protection
b36 Water-level switch alarm
b71 Reheat electric-heater fault
b72 Pre-treatment electric-heater fault
b81 Humidifier fault
C11 Duplicate indoor-unit address
C21 Indoor/outdoor communication fault
C41 Indoor main-PCB to fan-driver PCB communication fault
C51 Indoor unit to wired-controller communication fault
C52 Indoor unit to wireless-kit communication fault
C61 Indoor main-PCB to display-board communication fault
C71 Secondary-to-primary AHU-kit communication fault
C72 Detected AHU-kit count does not match configured count
C73 Linked humidification indoor unit to primary indoor unit communication fault
C74 Linked FAPU to primary indoor unit communication fault (serial setting)
C75 Linked FAPU to primary indoor unit communication fault (non-serial setting)
C76 Primary-to-secondary wired-controller communication fault
C77 Indoor main PCB to expansion board No. 1 communication fault
C78 Indoor main PCB to expansion board No. 2 communication fault
C79 Indoor main PCB to switching module communication fault
C81 Indoor unit is powered off
d16 Intake-air temperature too low in heating mode
d17 Intake-air temperature too high in cooling mode
D43 Refrigerant-leak sensor life reminder
d50 AHU-kit fan running-status input signal exception
d81 Temperature and humidity range-exceeded alarm
dE0 CO2 sensor fault
dE1 Sensor control-board fault
dE2 PM2.5 sensor fault
dE4 Formaldehyde sensor fault
dE5 Human-presence sensor fault
E21 T0 fresh-air intake temperature sensor open/short
E22 Upper dry-bulb temperature sensor open/short
E23 Lower dry-bulb temperature sensor open/short
E24 T1 indoor return-air temperature sensor open/short
E31 Wired-controller temperature sensor fault
E32 Wireless temperature sensor open/short
E33 External ambient temperature sensor open/short
E61 Tcp pre-cooled fresh-air temperature sensor open/short
E62 Tph pre-heated fresh-air temperature sensor open/short
E81 TA supply-air temperature sensor open/short
EA1 Supply-air humidity sensor fault
EA2 Return-air humidity sensor fault
EA3 Upper wet-bulb sensor fault
EA4 Lower wet-bulb sensor fault
EbE HRV PM2.5 sensor fault
EC1 R32 refrigerant-leak sensor fault
F01 T2A heat-exchanger liquid-pipe temperature sensor open/short
F11 T2 heat-exchanger mid-point temperature sensor open/short
F12 T2 heat-exchanger overheat protection
F21 T2B heat-exchanger gas-pipe temperature sensor open/short
FF PM2.5/CO2/formaldehyde sensor expiry reminder
P71 Indoor main-PCB EEPROM fault
P72 Indoor display-board EEPROM fault
P31 Fan-driver PCB AC-side overcurrent protection
P34 Fan-driver PCB AC-side overcurrent protection
P52 Power-supply voltage too low
J0b Water-pump motor driver fault
P5b DC power-cable sequence protection fault
P5F Power-supply phase-loss or phase-sequence protection
U01 Electronic lock active
U11 Indoor-unit model code not set
U12 Indoor-unit capacity code not set
U14 AHU-kit capacity DIP value does not match the model
U15 AHU-kit fan-speed output-voltage DIP value is invalid
U26 Indoor/outdoor model mismatch
U38 Indoor-unit address not detected
J01 Fan motor fault repeated more than once
J1E Fan-driver IPM overcurrent protection
J11 Instantaneous phase-current overcurrent protection
J3E DC-bus low-voltage fault
J31 DC-bus high-voltage fault
J43 Phase-current sampling-bias fault
J45 Fan motor and indoor unit mismatch
J47 Fan-driver IPM and indoor unit mismatch
J5E Fan motor start failure
J52 Fan motor locked-rotor protection
J55 Fan-speed control-mode setting fault
J6E Fan motor phase-loss protection
d0 Pre-heating or oil-return operation
dC Self-cleaning
dd Mode conflict state
dF Defrost operation
d51 Initial static-pressure detection
d61 Remote shutdown
d71 Indoor-unit backup operation
d72 Outdoor-unit backup operation
OTA Main-control software update
dH Hot-water mode (specific series)
E0 Communication error between outdoor units
E2 Communication error between MS box and master unit
E4 T3/T4 temperature sensor error
E5 Abnormal power supply voltage
E7 Discharge temperature sensor error (T7C1)
E8 Outdoor unit address error
E9 EEPROM mismatch of compressor
F1 DC bus voltage error
F3 T6B temperature sensor error
F5 T6A temperature sensor error
1F6 Electronic expansion valve A connection error
3F6 Electronic expansion valve C connection error
F9 T5 temperature sensor error
FA T8 temperature sensor error
Fb T9 temperature sensor error
Fc TL temperature sensor error
Fd T7 temperature sensor error
H0 Communication error between main board and compressor drive board
H2 Quantity of outdoor units has decreased
H3 Quantity of outdoor units has increased
H4 Compressor inverter module protection
H5 Low-pressure protection lockout after P2 occurs three times in 60 minutes
H6 Compressor discharge-temperature protection after P4 occurs three times in 100 minutes
H7 Quantity of indoor units does not match
H8 High-pressure sensor error
1H9 Fan A DC module protection after P9 occurs ten times in 120 minutes
2H9 Fan B DC module protection after P9 occurs ten times in 120 minutes
Hb Low-pressure sensor error
1Hd Slave outdoor unit 1 malfunction
2Hd Slave outdoor unit 2 malfunction
C7 Compressor inverter-module temperature protection after PL occurs three times in 100 minutes
P1 High-pressure protection
P2 Low-pressure protection
P31 Primary current protection
P32 Secondary current protection
P4 Discharge-temperature protection or discharge-temperature-switch protection
U0 Forced test operation is set, but the test is held for 30 minutes after power-on
1P9 Fan A DC module protection
2P9 Fan B DC module protection
PL Compressor inverter-module temperature protection
PP Compressor discharge insufficient-superheat protection
A0 Emergency stop
A11 Refrigerant-leakage protection with immediate system shutdown
A12 Refrigerant-leakage protection with system shutdown after 12 hours
A13 Refrigerant-leakage protection with system shutdown after 24 hours
CA2 System is connected only to a VRF DX AHU control box
CA3 System is connected only to a high-temperature hydro module
CA4 System is connected only to a VRF DX AHU control box and high-temperature hydro module
CA5 System is connected to VRF indoor units, a DX AHU control box, and a high-temperature hydro module
Cb1 VRF indoor-unit capacity is beyond the allowed connection range
Cb2 VRF DX AHU control-box capacity is beyond the allowed connection range
Cb3 High-temperature hydro-module capacity is beyond the allowed connection range
Cb4 Quantity of indoor units connected to the system is beyond the allowed range
L0 Inverter compressor module error
L1 DC bus low-voltage protection
L2 DC bus high-voltage protection
L3 Reserved display
L4 MCE error
L5 Zero-speed protection
L6 Motor parameter error
L7 Phase-sequence error
L8 Compressor frequency-hopping error
LA PED software verification failed
E0 Mode conflict
E1 Communication error between indoor and outdoor units
E2 Indoor ambient temperature sensor (T1) error
E3 Indoor heat-exchanger mid-point temperature sensor (T2) error
E4 Indoor heat-exchanger outlet temperature sensor (T2B) error
E6 Indoor fan error
E7 Indoor-unit EEPROM error
Eb Indoor EEV coil error
Ed Outdoor unit error
EE Water-level error
FE Indoor unit has not been assigned an address