Your Serena(M) R32 Series Multi Zone system is equipped with an advanced self-diagnostic function. To help identify a potential issue, the system will display a specific "error code"—usually a combination of letters and numbers—on the indoor or outdoor unit.
This guide is designed to help you accurately interpret these codes. Please find your code in the table below to see its meaning and link to the correct solution.
This guide applies to the following Serena(M) R32 Series Multi-Zone models:
18KM+D77
18KM+D79
18KM+D712
18KM+D99
18KM+D912
18KM+D1212
| Fault code | Fault description | Causes of possible failure |
| E1 | Fault with the room temperature sensor on the indoor unit | ● Damage of the room temperature sensor on the indoor unit
● Poor contact of the room temperature sensor on the indoor unit
● Damage of wiring of the room temperature sensor on the indoor unit
● Damage of the main PCB on the indoor unit
|
| E2 | Fault with the defrosting condenser temperature sensor in the outdoor unit | ● Damage of the temperature sensor on the outdoor unit
● Poor contact of the temperature sensor on the outdoor unit
● Damage of wiring of the temperature sensor on the outdoor unit
● Damage of the main PCB on the outdoor unit
|
| E3 | Fault with the temperature sensor of the indoor evaporator | ● Damage of the temperature sensor on the indoor unit
● Poor contact of the temperature sensor on the indoor unit
● Damage of wiring of the temperature sensor on the indoor unit
● Damage of the main PCB on the indoor unit
|
| E4 | Fault of the fan motor on the indoor unit | ● Low voltage
● Poor wiring
● Damage of the main PCB on the indoor unit
● Damage of the motor
|
| E5 (5E) | Communication error between the outdoor unit and the indoor unit | ● Damage of the main PCB on the indoor unit
● Damage of the main PCB on the outdoor unit
● Poor wiring
|
| F0 | Fault with the fan motor of the outdoor unit | ● Damage of motor |
| F1 | Module protection failure | ● Compressor damage
● Compressor IPM Module damage
● System blockage
|
| F2 | Compressor drive PFC protection |
● Damage of the PFC circuit components ● Reactor damage |
| F3 | Compressor protection failure | ● Compressor power line not connected
● Compressor sequence connection error
● Damage of compressor
● System blockage
|
| F4 | Fault with the discharge temperature sensor | ● Damage of the discharge temperature sensor on the outdoor unit
● Poor contact of the discharge temperature sensor on the outdoor unit
● Damage of wiring of the discharge temperature sensor on the outdoor unit
● Damage of the main PCB on the outdoor unit
|
| F5 | Temperature protection of compressor top cover |
● Damage of compressor top cover switch ● System blockage |
| F6 | Fault with the ambient temperature sensor in outdoor unit | ● Damage of the ambient temperature sensor on the outdoor unit
● Poor contact of the ambient temperature sensor on the outdoor unit
● Damage of wiring of the discharge temperature sensor on the outdoor unit
● Damage of the main PCB on the outdoor unit
|
| F7 | Fault with the over-voltage or low voltage protection | ● Excessive input voltage
● Lower input voltage
|
| F8 | Communication error between the driver PCB and main PCB of the outdoor unit | ● Damage of the driver PCB on the outdoor unit
● Damage of the main PCB on the outdoor unit
● Poor wiring
|
| F9 | Fault with the outdoor unit EEPROM | ● Chip damage |
| FA | Fault with the suction temperature sensor | ● Damage of the suction temperature sensor on the outdoor unit
● Poor contact of the suction temperature sensor on the outdoor unit
● Damage of wiring of the suction temperature sensor on the outdoor unit
● Damage of the main PCB on the outdoor unit
|
| P2 | High Pressure Switch Protection | ● System dirty blocking
● Damage of High Pressure Switch
|
| P3 | Protection of System Lack of Fluid | ● Lack of refrigerant
● Globe Valve Not Opened
|
| P4 | High Temperature Protection for Refrigeration Outdoor | ● Poor outdoor heat transfer |
| P5 | Protection of high discharge temperature | ● Lack of the refrigerant
● Stop valve unopened
● Damage of the main PCB on the outdoor unit
|
| P6 | High temperature protection in heating room | ● Poor indoor heat transfer |
| P7 | Indoor anti-freezing protection | ● Dirty Blockage of Heat Exchanger in Refrigeration Indoor unit
● Blockage of Internal Fan
|
| P8 | AC Over-current protection of the whole machine | ● Excessive running current of the unit
● Voltage drops abruptly in operation
|
| H1 | Fault with the drainage on the indoor unit | ● Float switch disconnected or poor wiring
● Error setting of model parameters
● Drain plug
● Damage of the pump
|
| H2 | Communication error between the wired controller and main PCB of the indoor unit | ● Poor wiring
● Damage of the wired controller
● Damage of the main PCB on the indoor unit
|
| H3 | Fault with the liquid pipe temperature sensor in outdoor unit | ● Damage of temperature sensor at N# evaporator inlet
● Poor contact of temperature sensor at N# evaporator inlet
● Damage of temperature sensor at N# evaporator inlet
● Damage of the main PCB on the outdoor unit
|
| H4 | Fault with the gas pipe temperature sensor in outdoor unit | ● Damage of temperature sensor at N# evaporator outlet
● Poor contact of temperature sensor at N# evaporator outlet
● Damage of wiring of temperature sensor at N# evaporator outlet
● Damage of the main PCB on the outdoor unit
|
| H5 | Protection lower temperature discharge | ● Temperature sensor shedding
● Damage of the main PCB on the outdoor unit
|
| H6 | Low pressure switch protection | ● Lack of the refrigerant
● Stop valve unopened
● Damage of low pressure switch
|
| H7 | Low pressure protection | ● Lack of the refrigerant
● Heat exchanger viscera
|
| H8 | Fault of four way valve | ● Damage of four-way valve
● Damage to coil of four-Way valve
|
| H9 | Inter-computer communication line connection fault | / |
| L0 | DC Over/Under-voltage Failure | ● Excessive input voltage
● Lower input voltage
|
| L1 | Over voltage protection of compressor | ● Damage of compressor
● System viscera
|
| L2 | Compressor operation failure | ● Damage of compressor
● System viscera
|
| L3 | Phase-absence protection of compressor | ● Damage of compressor
● Compressor power line not connected
|
| L4 | IPM Fault of compressor Drive module | ● Compressor drive module damage |
| L5 | Compressor drive PFC hardware protection | ● Damage of the PFC circuit components
● Reactor damage
|
| L6 | Compressor drive PFC software protection | ● Excessive running current of the unit
● Voltage drops abruptly in operation
|
| L7 | AD Abnormal protection for compressor current detection | ● Sensor damage of compressor IPM module |
| L8 | Compressor superpower protection | ● Sampling resistance damage
● Excessive operating power of compressor
|
| L9 | IPM Temperature sensor fault | ● Compressor IPM Module sensor damage
● Poor contact between compressor IPM module and radiator
|
| LA | Compressor start failure | ● Compressor power line not connected |
| LC | PFC Current Detection AD Abnormal Protection | ● Failure of PFC Module Circuit Device |
| LD | AD Abnormal Protection for Outdoor DC Fan Current Detection | ● Failure of DC Fan Module Circuit Device |
| LE | Phase-lacking protection of outdoor DC fans | ● DC fan line not connected
● Three wires of DC fan are disconnected
|
| LF | Outdoor DC Fan Out-of-step Protection | ● DC motor failure
● High Speed of DC Fan
● System dirty blocking
|
| LH | IPM Protection of Outdoor DC Fan | ● The IPM Device of DC Motor is Bad |
For detailed, step-by-step solutions for all the codes listed above, please view the complete troubleshooting guide.
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