Troubleshooting guide
1.H series & E series (For LED display:Timer indicator (Yellow lamp) flashes):
Trouble source |
Displayed phenomenon |
Display priority class |
PG motor of indoor unit feedback abnormity (PG电机反馈) |
Sparkle 4 times per 8 seconds |
1 |
Temperature sensor of air intake abnormity (室温传感器-塑料) |
Sparkle 1 time per 8 seconds |
2 |
Temperature sensor of indoor unit coil abnormity (内盘温控探头-铜柱) |
Sparkle 2 times per 8 seconds |
3 |
Temperature sensor of outdoor unit coil abnormity (外盘温控探头-铜柱) |
Sparkle 1 time per 1 second |
4 |
2.H series & E series (For Digital display):
Trouble source |
Displayed phenomenon |
Display priority class |
PG motor of indoor unit feedback abnormity (PG电机反馈) |
E4 |
1 |
Temperature sensor of air intake abnormity (室温传感器-塑料) |
E1 |
2 |
Temperature sensor of indoor unit coil abnormity (内盘温控探头-铜柱) |
E3 |
3 |
Temperature sensor of outdoor unit coil abnormity (外盘温控探头-铜柱) |
E2 |
4 |
Communication abnormity between outdoor unit and indoor unit (信号线) |
E5 |
5 |
Note: 1. “Sparkle 1 time per 8 seconds” indicated on LED display model is the same as “E1” displayed on Digital display model.
2. “Sparkle 1 time per 1 seconds” indicated on LED display model is the same as “E2” displayed on Digital display model.
3.“Sparkle 2 times per 8 seconds” indicated on LED display model is the same as “E3” displayed on Digital display model.
4.“Sparkle 4 times per 8 seconds” indicated on LED display model is the same as “E4” displayed on Digital display model.
Explanations as follows:
- 1. E1 and E3 is the problem of temperature sensor in indoor unit. Two temperature sensors are in indoor unit. One is made of plastic material and another one is made of copper material. If the plastic sensor is damaged, for example, its resistance value deviates from its original value greatly, E1 malfunction indication will spear. Or, this sensor’s signal cable is broken and no signal will be received from this sensor, E1 will appear as well. So, when E1 appear, maintenance man should test its resistance value and its cable connection with PCB.
- 2. As said above, there is a copper sensor which used to detect the outlet temperature of evaporator. If the sensor’s cable broken or sensor’s resistance deviating from its original correct value, E3 will appear. Check its value and its cable connection with PCB.
- 3. The standard resistance value for the two above sensors is 5kΩ at 25℃. The two different sensors have the same standard values. If the tested value is abnormal, what you need to do is to replace it with a new one.
- 4. As for the E2 problem, if the signal cable between indoor unit and outdoor unit has not been connected, for example, the cable is broken or has not been connected with the outdoor socket, the E2 will appear. Generally, it can be caused by the unqualified installers. In domestic market, many customers told us about this problem. After checking, we found the cable from indoor unit was forgotten to be connected with the outdoor socket. If the outdoor copper sensor itself is defaulted, the E2 will appear as well, for example, the sensor is broken, the resistance is infinite. At this condition, you should check the cable, the socket, the sensor to find where the problem is. Generally, this problem is easy to be repaired.
- 5. Generally, when E4 problem happen, it mustn’t be the problem of PG motor. Firstly, maybe the electrical connection are not very well, so please turn off the power supply and check the wire connection of the indoor motor then restart the appliance once again to see whether there is also E4 display on the panel. If the answer is Yes, please try to replace another PCB, because there are some electronic components are damaged and cut off the feedback circuit of the motor, E4 will appear as well. So, you should check whether there is something wrong with PCB. If the PCB is good, you should check the PG motor of indoor unit.
- 6. E5 will appear when communication failed between indoor and outdoor unit for dual type air conditioners (Multi-split Type). (主要针对一拖二机型)
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REMARKS:
Testing method of Temperature sensor resistance
Cut off the Power supply, use Multimeter to measure the resistance of the sensor.
1. For two indoor unit sensors: Dismantle the electric control box, pull the sensor socket out of the the PCB. There are two sensors sockets, one is for Room temperature (colored Yellow), the other is for Pipe temperature (colored RED).
2. Use the Multimeter to measure the resistance of the related sensor, the two fingers of the Multimeter (Red and Black) should touch completely to the small metal plate of the sensor socket.
3. The outdoor sensors can also be measured to the way mentioned above.
4. All these three sensors have the same Standard resistance value, generally 5kΩ at 25℃,please notice that the value will change according to the environmental temperature, actually there exits a reverse-ratio relation. You can refer to the attached Table for Standard resistance value of the sensor.




Standard resistance value of the sensor
502AT-3470[unit:temperature(℃)、resistance(kΩ)]
Temperature |
Lower limit |
Standard value |
Upper limit |
Temperature |
Lower limit |
Standard value |
Upper limit |
-30.0 |
62.017 |
64.152 |
66.288 |
11.0 |
8.667 |
8.8008 |
8.932 |
-29.0 |
58.674 |
60.662 |
62.650 |
12.0 |
8.313 |
8.4385 |
8.560 |
-28.0 |
55.536 |
57.387 |
59.238 |
13.0 |
7.975 |
8.0934 |
8.207 |
-27.0 |
52.589 |
54.314 |
56.038 |
14.0 |
7.653 |
7.7643 |
7.870 |
-26.0 |
49.821 |
51.428 |
53.035 |
15.0 |
7.347 |
7.4506 |
7.549 |
-25.0 |
47.219 |
48.717 |
50.214 |
16.0 |
7.054 |
7.1513 |
7.243 |
-24.0 |
44.772 |
46.168 |
47.565 |
17.0 |
6.776 |
6.8658 |
6.952 |
-23.0 |
42.470 |
43.772 |
45.075 |
18.0 |
6.510 |
6.5934 |
6.674 |
-22.0 |
40.303 |
41.518 |
42.733 |
19.0 |
6.256 |
6.3333 |
6.409 |
-21.0 |
38.263 |
39.397 |
40.531 |
20.0 |
6.013 |
6.0850 |
6.157 |
-20.0 |
36.341 |
37.399 |
38.458 |
21.0 |
5.781 |
5.847 |
5.914 |
-19.0 |
34.529 |
35.517 |
36.506 |
22.0 |
5.559 |
5.6213 |
5.683 |
-18.0 |
32.821 |
33.744 |
34.667 |
23.0 |
5.347 |
5.4048 |
5.462 |
-17.0 |
31.210 |
32.072 |
32.934 |
24.0 |
5.144 |
5.1978 |
5.251 |
-16.0 |
29.689 |
30.495 |
31.300 |
25.0 |
4.950 |
5.0000 |
5.050 |
-15.0 |
28.254 |
29.007 |
29.759 |
26.0 |
4.760 |
4.8108 |
4.861 |
-14.0 |
26.898 |
27.602 |
28.305 |
27.0 |
4.579 |
4.6298 |
4.680 |
-13.0 |
25.617 |
26.275 |
26.933 |
28.0 |
4.406 |
4.4566 |
4.507 |
-12.0 |
24.406 |
25.021 |
25.636 |
29.0 |
4.240 |
4.2909 |
4.341 |
-11.0 |
23.261 |
23.836 |
24.411 |
30.0 |
4.082 |
4.1323 |
4.182 |
-10.0 |
22.177 |
22.715 |
23.254 |
31.0 |
3.930 |
3.9804 |
4.030 |
-9.0 |
21.140 |
21.643 |
22.146 |
32.0 |
3.784 |
3.8349 |
3.884 |
-8.0 |
20.158 |
20.629 |
21.099 |
33.0 |
3.645 |
3.6955 |
3.744 |
-7.0 |
19.229 |
19.669 |
20.109 |
34.0 |
3.512 |
3.5620 |
3.610 |
-6.0 |
18.349 |
18.760 |
19.172 |
35.0 |
3.384 |
3.4340 |
3.482 |
-5.0 |
17.515 |
17.900 |
18.285 |
36.0 |
3.262 |
3.3113 |
3.359 |
-4.0 |
16.725 |
17.086 |
17.446 |
37.0 |
3.145 |
3.1937 |
3.241 |
-3.0 |
15.976 |
16.313 |
16.651 |
38.0 |
3.033 |
3.0809 |
3.128 |
-2.0 |
15.266 |
15.582 |
15.897 |
39.0 |
2.925 |
2.9727 |
3.019 |
-1.0 |
14.592 |
14.888 |
15.183 |
40.0 |
2.822 |
2.8688 |
2.915 |
0.0 |
13.953 |
14.229 |
14.506 |
41.0 |
2.723 |
2.7692 |
2.815 |
1.0 |
13.341 |
13.600 |
13.858 |
42.0 |
2.627 |
2.6735 |
2.718 |
2.0 |
12.760 |
13.002 |
13.244 |
43.0 |
2.536 |
2.5816 |
2.626 |
3.0 |
12.209 |
12.435 |
12.661 |
44.0 |
2.448 |
2.4934 |
2.537 |
4.0 |
11.685 |
11.896 |
12.108 |
45.0 |
2.364 |
2.4087 |
2.452 |
5.0 |
11.187 |
11.385 |
11.583 |
46.0 |
2.283 |
2.3273 |
2.370 |
6.0 |
10.713 |
10.899 |
11.084 |
47.0 |
2.206 |
2.2491 |
2.291 |
7.0 |
10.263 |
10.436 |
10.610 |
48.0 |
2.132 |
2.1739 |
2.215 |
8.0 |
9.835 |
9.9995 |
10.159 |
49.0 |
2.060 |
2.1016 |
2.143 |
9.0 |
9.427 |
9.5802 |
9.731 |
50.0 |
1.991 |
2.0321 |
2.073 |
10.0 |
9.039 |
9.1810 |
9.323 |
51.0 |
|
|
|
Temperature |
Lower limit |
Standard value |
Upper limit |
Temperature |
Lower limit |
Standard value |
Upper limit |
50.0 |
|
2.0321 |
|
81.0 |
|
0.7730 |
|
51.0 |
|
1.9656 |
|
82.0 |
|
0.7508 |
|
52.0 |
|
1.9016 |
|
83.0 |
|
0.7293 |
|
53.0 |
|
1.8399 |
|
84.0 |
|
0.7086 |
|
54.0 |
|
1.7804 |
|
85.0 |
|
0.6885 |
|
55.0 |
|
1.7232 |
|
86.0 |
|
0.6690 |
|
56.0 |
|
1.6680 |
|
87.0 |
|
0.6502 |
|
57.0 |
|
1.6149 |
|
88.0 |
|
0.6320 |
|
58.0 |
|
1.5636 |
|
89.0 |
|
0.6144 |
|
59.0 |
|
1.5142 |
|
90.0 |
|
0.5973 |
|
60.0 |
|
1.4666 |
|
91.0 |
|
0.5808 |
|
61.0 |
|
1.4206 |
|
|
|
|
|
62.0 |
|
1.3763 |
|
|
|
|
|
63.0 |
|
1.3336 |
|
|
|
|
|
64.0 |
|
1.2923 |
|
|
|
|
|
65.0 |
|
1.2526 |
|
|
|
|
|
66.0 |
|
1.2142 |
|
|
|
|
|
67.0 |
|
1.1771 |
|
|
|
|
|
68.0 |
|
1.1413 |
|
|
|
|
|
69.0 |
|
1.1068 |
|
|
|
|
|
70.0 |
|
1.0734 |
|
|
|
|
|
71.0 |
|
1.0412 |
|
|
|
|
|
72.0 |
|
1.0100 |
|
|
|
|
|
73.0 |
|
0.9800 |
|
|
|
|
|
74.0 |
|
0.9509 |
|
|
|
|
|
75.0 |
|
0.9228 |
|
|
|
|
|
76.0 |
|
0.8957 |
|
|
|
|
|
77.0 |
|
0.8695 |
|
|
|
|
|
78.0 |
|
0.8441 |
|
|
|
|
|
79.0 |
|
0.8196 |
|
|
|
|
|
80.0 |
|
0.7959 |
|
|
|
|
|