| Problems |
Indoor Error Code |
Outdoor Display |
Solution |
| Room temperature sensor fault |
E1 |
/ |
"1、Check whether there is short circuit or open circuit .
2、If the sensor is right, then check whether the sensor is in the right position and connected to PCB board properly.
3、Check whether there is any water or damp on sensor.
4、If there is no standard sensor on hand, change the sensor with the neibouring sensor to see whether the fault is disappears or not, if it disappears, the sensor needs to be replaced, if it remains, then change the PCB board. " |
| Outdoor coil temperature sensor fault |
E2 |
/ |
"1、Check whether there is short circuit or open circuit .
2、If the sensor is right, then check whether the sensor is in the right position and connected to PCB board properly.
3、Check whether there is any water or damp on sensor.
4、If there is no standard sensor on hand, change the sensor with the neibouring sensor to see whether the fault is disappears or not, if it disappears, the sensor needs to be replaced, if it remains, then change the PCB board. " |
| Indoor coil temperature sensor fault |
E3 |
/ |
"1、Check whether there is short circuit or open circuit .
2、If the sensor is right, then check whether the sensor is in the right position and connected to PCB board properly.
3、Check whether there is any water or damp on sensor.
4、If there is no standard sensor on hand, change the sensor with the neibouring sensor to see whether the fault is disappears or not, if it disappears, the sensor needs to be replaced, if it remains, then change the PCB board. " |
| indoor fan motor or DC motor feedback fault |
E4 |
/ |
"1、Observe wether the fan motor can run for a while before the error code, if so,mechanical jamming can be excluded；
2、Check wether the plug of the motor is well connected or not.
3、Changed a new PG motor,if the error code E4 remains,then change the PCB board ." |
| indoor & outdoor communication fault |
E5/5E |
Flash |
"1、Firstly, the IDU and the ODU should be connected properly.
2、Observe the ODU main PCB board, turn on the air conditioner, three lights are all lighted up then off and the relay pulls in. If not, it is power supply problem.
3.Connect the black signal line S to terminal N of ODU. Turn on the air conditioner, if ""5E"" is still be reported, the main PCB board of ODU need to be replaced.
4.Check the IDU main PCB board,replace it." |
| IPM modular fault |
F1 |
|
"1. The three compressor wires should be red to U, blue to V, black to W, or it will lead to reversal of compressor. Reverse any two phases to see whether the problem can be solved.
2. The voltage between L and N on the terminal board of the ODU must be within 10% tolerance of the rated voltage. Check the pressure of the system.
3. Check whether the module board is well fixed on the radiator, whether the condensor and the evaporator are clean enough.
4. If the error code F1 is reported immediately after turn on the air conditioner, you should observe whether there is any damage around the module board.Mrasure the resistance between each two wires of compressor,it should be same and very small. Then check the insulation of three compressor wire to the ground wire. Check the reactor.
5. Change a new module board instead,if the fault code disappears,it's the problem of the module board." |
| PFC modular fault |
F2 |
|
"1、 test whether the power supply voltage is fluctuate wildly or the voltage is too low (less than alternating current 135 v)；
2、 reactor is one of the core parts in PFC, please check whether there is any damage to the reactor itself, whether the connecting wire of reactor well connected which causes the malfunction of PFC. Reactor can not be removed and replaced by short circuit directly；
3、if ""PFC protection fault"" is reported immediately after the start up of the air conditioner, it can be basically defined as a substantive fault which has nothing to do with the power supply voltage and the system pressure.Please observed whether there is obvious lighting damaged device around PFC board；
4、Test whether the power supply of 15 V, 5 V (3.3 V) on PFC board is stable to eliminate the problem of supply of external main control board which causes the malfunction of PFC fault；
5、 Normal PFC board can be used to replace the original one for testing. If the test is normal after replacing the PFC board, it indicateds that the original PFC board is damanged；
6、There exists probability that there are problems in power supply of 15V or 5V of module board that leads to the malfunction of the control power of PFC board
7、 Some module board integrates PFC function and compressor driving function together, then the intergrated module board can be changed directly；
" |
| Compressor operation fault |
F3 |
|
Refer to F1 fault |
| Exhaust Temperature sensor fault |
F4 |
|
"1.lack or excess refrigerant may lead this problem.
2.Check whether the exhaust tem sensor is short circuit or open circuit." |
| Compressor top cover protection |
F5 |
|
The test points are the same as that of common sensors. |
| Outdoor ambient temp sensor fault |
F6 |
|
The test points are the same as that of common sensors. |
| Over/under voltage protection |
F7 |
|
"1、check the power voltage, it must be within 10% tolerance of the rated voltage.
2、The voltage between P-N on module board is above 280VDC. If the voltage is lower, the PFC circuit is damaged；
3、 If ""F7"" is reported once the air conditioning is powered on and the power voltage is not lower than 150 V measured by multi-meter, it may be the problem of main PCB of ODU." |
| Outdoor modular communication fault |
F8 |
|
"1.Ccheck whether the communication connecting wire ( mostly 4 core) between module board and main control board is loose or the cable is loose.
2. use a multi-meter to measure whether the power supply introduced from main control board is normal, especially whether the power of 5V has been led to module board. Find ""5V"" and ""GND"" on the module board and test whether the voltage of 5V on the module is normal；
3、 Use normal module board to replace the module board on the malfunctioned air conditioning board. When the external machine is powered on, if communication failure disappears, it indicates that the problem is on the original module board, if there still exists communication failure, the external main control board should be replaced；" |
| Outdoor E²PROM fault |
F9 |
|
EEPROM chips are usually welded with the external main control board together. If "external machine EEPROM fault" is reported,replace the main control board directly can fix it； |
| Outdoor DC Fan motor fault |
F0 |
|
"1.DC motor usually runs softly. Observe whether the speed of fan is accelerated to the highest speed when started, if so, the speed feedback signal has not been received by main controller board；
2 .Check the connection between the DC motor and terminal board.
3.change a new motor, if fault is still reported, then replace the main PCB board." |
| Suction temperature sensor fault（four-way valve switch failure） |
FA |
|
"1、 if the fault occurs only on heating modle, On heating modle, please check whether the 4-way valve can be charged with 220V AC. If so , it must be the problem of 4-way valve, if not,replace the main PCB board.
2.Check the sensors." |
| Outside dish prevent overload protection (refrigeration) |
P4 |
|
"1、pls check whether the condensing pressure is overhigh nor not;
2、problem comes from the damaged oudoor coil temp.sensor if the condensing pressure is nomal, solution is to replace the sensor probe accordingly;
3、pls check whether the consenser is dirty or not、air circulation of condensor is blocked or not、outdoor fan motor is operating normally or not、whole circulation system is blocked or not if the condensing pressure is overhigh;" |
| Exhaust protection |
P5 |
|
"1、pls check whether the temp.of probe is overhigh nor not; if not,then problem comes from the damaged temp.sensor,solution is to replace the exhaust temp.sensor accordingly;
2、if so,pls check whether oudoor fan is operating or not、condensor is blocked、dirty or not、whole system is blocked or not or lacking of refrigerant etc;" |
| The indoor heat protection (heating) |
P6 |
|
"1、pls check whether the condensing pressure is overhigh or not;
2、if not,then problem comes from the damaged indoor coil temp.sensor,solution is to replace the sensor probe accordingly;
3、if so,pls check the indoor fan motor is operating normally or not、air inlet is blocked or not 、air filter is blocked、dirty or not." |
| Indoor anti freeze protection (refrigeration) |
P7 |
|
"1、pls check the value of indoor coil temp.sensor is correct or not;
2、pls check the indoor fan motor is operating normally or not、air inlet is blocked or not 、air filter is blocked、dirty or not.
3、pls check the whole circulation system is blocked or not or lacking of refrigerant;" |
| Outdoor over-current protection |
P8 |
|
"1、pls check whether the real operating current is large or not,if not,it must be problem of mian PCB;
2、pls check whether the pressure of whole circulation system is overhigh or not、compressor is operating normally or not、the condenser is blocked or not、outdoor fan motor is operating normally or not;" |
| High pressure protection |
P2 |
|
|