Running heating and cooling
Indoor thermistor is abnormal ★■■ * * 1. Poor connector contact or poor control substrate.
The thermistor is abnormal ★□□□□ * *1. Poor connector contact or poor control substrate.
Defrosting thermistor is abnormal □□★ * * 1. Poor connector contact or poor control substrate.
Abnormal discharge of thermistor ★□■ * * 1. Poor connector contact or poor control substrate.
Abnormal thermistor of substrate □■★ * * 1. Poor connector contact or poor control substrate.
Abnormal module thermistor □★□ * * 1. Poor connector contact or poor control substrate.
Outdoor thermistor is abnormal □★■ * * 1. Poor connector contact or poor control substrate.
Transmission exception ■■★ * 1. There are a lot of interference sources around.
* 2. Wrong wiring or poor control substrate
The printing machine is running abnormally ★■□ * 1. 1. Whether the compressor is shaft-locked.
2.2. Whether the power module is damaged.
Discharge over-temperature protection ■★■ * 1. 1. Is the system short of gas or over-injected?
2.2. Whether the voltage is too high (higher than 242V) or too low (lower than 187V). . 3.3. Whether the capillary tube is blocked.
4.4. Whether the sensor or control substrate element is abnormal. . 5.5. Is the indoor and outdoor ambient temperature too high?
Ac current protection ★★■ * 1. 1. Is there too much gas injection in the system?
2.2. Is the voltage too low (below 187V)?
3.3. Whether CT or control substrate components are abnormal. DC current protection ★★□ * 1. 1. Whether the compressor is shaft-locked.
2.2. Whether the power module is damaged.
3.3. Is the voltage too high (higher than 242V) or too low (lower than 187V)?
Insufficient voltage protection ■★□ * 1. 1. Is the voltage too low?
2.2. Control whether the substrate is damaged.
Outdoor substrate temperature protection ■★★ * 1. 1. Control whether the substrate is abnormal.
2.2. Is the outdoor ambient temperature too high?
Module temperature rise protection □★★ * 1. 1. Whether the compressor is shaft-locked.
2.2. Whether the power module is damaged.
3.3. Whether the heat dissipation glue is uniform
4.4. Is the voltage too high (higher than 242V) or too low (lower than 187V)?
High load protection ★★★ * 1. 1. Is the filter clogged?
2.2. Is the indoor and outdoor ambient temperature too high?
3.3. Is there too much gas injection?
4.4. Control whether the base element is damaged.
5.5. Is the voltage too high or too low?
CT disconnection protection ★■★ * 1. 1. Control whether the substrate is damaged.
2.2. The system is short of gas
3.3. The four-way valve is not correctly reversed. EEPROM is abnormal ★□★ * 1. Is the control substrate damaged?
* 1. Control whether the substrate is damaged.
Abnormal internal fan ■□★ *
explain
□ On ★ Flash ■ Off * indicates that this function is available.
1.KX, KX4, FX, LX, unit machine series-fault code list
Code fault content
No display power problem; Fuse blown; Bad connection of X, Y and Z signal lines; Bad wire controller.
The communication between the E 1 line controller and the internal substrate is poor.
(When multiple machines are driven at a fixed frequency, and 1 line controller controls multiple internal machines, 1 internal machine power is cut off or internal machine addresses are duplicated, which may lead to E 1).
E2 indoor units have duplicate addresses or there are more than 49 indoor units in the 1 signal line system.
E3 cannot detect the outdoor unit. (E3 appears when the fuse at the CNK terminal of the inner board signal line is blown. If the fuse is blown, plug in the CNK2 terminal. )
Poor communication between E5 indoor unit and outdoor unit; External power is off.
(E5 appears in many internal machines, and the power supply of external machines is generally off.)
E6 indoor heat exchange temperature sensor is disconnected.
E7 Indoor ambient temperature sensor is disconnected.
E8 overload protection during heating (internal heat exchange temperature exceeds 68℃)
E9 ①
Internal floating switch action
(Only applicable to air blowers with floating switches, embedded machines and ultra-thin air blowers).
② For machines without floating switches, the power supply voltage is too low (lower than 70% of the rated voltage).
③ For 20P cabinet, the internal fan current is too large, the compressor exhaust temperature is too high, or it is caused by high voltage protection.
E 10 1 The line controller controls multiple internal machines, and the number of internal machines is too large (greater than 17).
E 1 1 Use the line controller to set the address of the internal machine. 1 The line controller controls more than two internal machines.
E 12 indoor unit address switch is not set correctly.
E 14 drives one machine with constant frequency, and the communication between indoor master and slave is not smooth; Wrong address setting.
E 15 indoor unit blow-out temperature sensor is damaged. (Applicable to KX air duct new fan with air sensor)
E 16 indoor substrate is defective. (For KX4 machines)
E28 The temperature sensor on the line controller is disconnected. (When the temperature sensor for setting the wire controller is effective)
E30 Internal and external machine connections do not match; The external machine number corresponding to the internal machine is the child machine number.
E3 1 duplicate outdoor unit address.
E32 power supply is out of phase or reversely connected.
E33 compressor overcurrent. (currently running)
The secondary side E34 52C2 T phase power supply is out of phase. (The current detected by CT2 of KX host is 0)
E35 refrigeration overload operation. (The heat exchange temperature of the external machine exceeds 70℃).
E36 compressor discharge temperature is abnormal (KX and KX4 exceed 130℃).
E37 Outdoor heat exchange temperature sensor is disconnected.
E38 Outdoor ambient temperature sensor is disconnected.
E39 compressor discharge temperature sensor is disconnected.
E40 ①
High voltage switch 63H 1 action;
②
The internal thermal protection 49C of the compressor operates;
③
Compressor exhaust temperature switch action (10P unit) or excessive temperature (FX, LX);
④
Power supply voltage is too low (unit machine).
E4 1 Power module temperature is too high (KX, KX4 machines)
E42 compressor overcurrent (excessive current at startup)
E43 The number or capacity of indoor unit connections exceeds the specified value.
E45 Abnormal communication of frequency conversion control substrate
The automatic address, manual address and address setting of E46 line controller are mixed in the same signal line system.
E48 Abnormal outdoor DC fan (KX4 machine)
E49 Low noise anomaly (PSL), (KX4 machine).
E53 suction pipe temperature sensor disconnected (Tho-S)(KX4 machine)
E54 High Pressure Sensor Disconnect (PSH)(KX4 Machine)
E56 Power transistor temperature sensor disconnected (Tho-P 1)(KX4 machine)
E57 63L low voltage switch action; Insufficient refrigerant; The compressor is not running (unit).
E59 compressor started poorly (CM) (KX4 machine)
Abnormal rotor position of E60 compressor (CM 1)
E6 1 outdoor communication between master and slave machine is abnormal.
E62 The outdoor subunit address is set incorrectly.
E63
E75 Emergency Stop (KX4 Machine)
The signal wire is badly connected and the signal wire is short-circuited. (For centralized/central controller).
2. Check the fault code of wireless remote control model.
Because the remote control model has no display screen, it cannot directly display the fault code, so the fault code should be determined according to the blinking times of the operation indicator and the detection indicator.
2. 1 unit remote control mode fault code check
Running lamp (green) detection lamp (yellow) fault code
Shine 1 e 6
Shine twice E7
Shine 4 times E9
Shine 5 times E57
Shine 6 times E8
Shine twice E40
2.2 fault code inspection of FX and LX models
Running light (green) detection light (yellow) external digital tube display
(SW 1 switch in 1 position) Fault code and meaning
Flash 1 time E6 indoor heat exchange temperature sensor is disconnected.
Flash twice. E7 indoor suction temperature sensor is broken.
Shine for 3 times. E5 has poor indoor and outdoor communication.
E9 floating switch flashes 4 times.
Shine 6 times E8 greenhouse overload
Running mode conflict between internal machines that keep flashing.
Shining 1 time E37 E37 outdoor heat exchange temperature sensor is disconnected.
E38 flashes twice. E38 outdoor ambient temperature sensor is disconnected.
E39 compressor discharge temperature sensor is broken.
Exhaust temperature of E40 compressor with four times flash evaporation is too high.
Illuminated for 5 times, E40 E40 outdoor high-voltage switch acts for 63H.
E57 outdoor low-voltage switch 63L flashes 5 times E57.
Shining for 7 times E32 E32 Outdoor power supply is out of phase or out of phase.
E33 E33 compressor overcurrent, flashing 7 times.
3. Turbine fault code
The cause of the fault code
F 1 power supply is out of phase or reversed.
F2 pump overcurrent protection (5 1P) action
F3 compressor overcurrent relay (5 1C) works.
F4 high voltage switch 63H 1 action
F5 outlet water temperature sensor failure (T 1)
F6 outdoor heat exchange temperature sensor fault (T3)
F7 Ambient temperature sensor fault (T4)
F8 refrigerant temperature sensor fault (T5)
F9 water flow switch (5 1S)
FA(F 10) Exhaust temperature sensor failure (T6)
FB(F 1 1) electrical auxiliary thermal protection (5 1H) switch action.
FC(F 12) circulating water antifreeze protection
FD(F 13) undervoltage protection
Exhaust temperature of FE(F 14) is too high (T6) exceeding 130℃.
FF(F 15) communication is abnormal (between substrate and line controller)
F0(F 16) inlet water temperature sensor failure (T2)
E 1 low temperature protection
4. Machine room air conditioner MDC265AC fault code
Code fault content
E0 1 overcurrent relay of indoor air supply motor (5 1F 1) operates (exceeding 14A)
E02 compressor motor overcurrent relay (5 1C) runs (more than 50A)
E03 Abnormal high pressure (greater than 2.8MPa)
E04 abnormally low pressure (less than 0.05MPa)
E05 compressor internal overheating protection (49C) action (over 90℃)
E06 compressor discharge temperature is too high (TH2), exceeding 135℃.
E07 Over-current relay of outdoor air supply motor (5 1F0) operates (above 1.7A)
E08 bimetallic temperature switch (26HU) is used for humidifier temperature protection (over 1 15℃).
E09 humidifier water cut-off switch (63W) works, and the water cut-off is abnormal.
E 10 leakage switch (ELB) action (exceeding 100mA)
E 1 1 air cleaner differential pressure switch (63A) operates (exceeding 180Pa)
E 12 water leakage floating control switch (FS 1) works.
E 13 water leakage floating switch (FS2) works. (Optional parts, need to be installed separately)
E 14 water leakage floating switch (FS3) works. (Optional parts, need to be installed separately)
E 15 water leakage floating switch (FS4) works. (Optional parts, need to be installed separately)
E 16 the temperature sensor (RA 1) of the air inlet drying bulb is disconnected. The sensor model is Pt 100.
E 17 air drying bulb temperature sensor (SAD 1) is disconnected. The sensor model is Pt 100.
E 18 air outlet relative humidity sensor (SAR 1) is disconnected.
E 19 indoor heat exchange temperature sensor (TH 1) is disconnected.
E20 compressor discharge temperature sensor (TH2) is disconnected.
E2 1 External input (inlet dry bulb temperature RA2) is disconnected.
E22 External input (air drying bulb temperature SAD2) is disconnected.
E23 external input (air outlet relative humidity sensor SRA2) is disconnected.
E24 power supply is not good.
E25 HP sensor is abnormal. The pressure is below 0 MPa.
E26 Low pressure sensor (LP) is abnormal. The pressure is higher than 1.9MPa.
Fault codes vary from manufacturer to manufacturer! You can check it yourself.