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Trouble shooting
Possible reasons
Faulty of outdoor unit EEPROM
IPM overcurrent or short circuit
Communication failure between Module and ECU
Module operated overload
Module low or high voltage
Discharging temperature overheating.Lack of refrigerant,
ambient temperature too high or PMVs blocked.
Malfunction of the DC fan motor
Malfunction of defrosting temp. sensor
Malfunction of compressor suction temp. sensor
Malfunction of ambient temp. sensor
Malfunction of compressor discharge temp. sensor
Communication failure between indoor&outdoor unit
Lack of refrigerant or discharging pipe blocked
4-way valve switching failure
Loss of synchronism detection
Indoor thermal overload
Indoor frosted
Module thermal overload
Compressor start failure
Module input overcurrent
MCU reset
Module input current detect circuit malfunction
Malfunction of liquid pipe temp. sensor for indoor unit A
Malfunction of liquid pipe temp. sensor for indoor unit B
Malfunction of liquid pipe temp. sensor for indoor unit C
Malfunction of liquid pipe temp. sensor for indoor unit D
Malfunction of gas pipe temp. sensor for indoor unit A
Malfunction of gas pipe temp. sensor for indoor unit B
Malfunction of gas pipe temp. sensor for indoor unit C
Malfunction of gas pipe temp. sensor for indoor unit D
Malfunction of gas pipe temp. sensor for indoor unit E
Malfunction of module temp.sensor
Momentary power failure detection
Malfunction of condensing temp. sensor
Malfunction of liquid pipe temp. sensor for indoor unit E
Malfunction of 'Toci' temp. sensor
System high pressure switch off
System low pressure switch off
System high pressure protection.Refrigerant
overabundance,High condensing temp. or
malfunction of fan motor.
System low pressure protection.Refrigerant shortage,
Low defrosting temp., or malfunction of fan motor.
Outdoor LED
Wired
display
controller
display
1
15
2
16
4
18
5
19
6
1A
8
1C
9
1D
10
1E
11
1F
12
20
13
21
15
23
16
36
17
25
18
26
20
28
21
29
23
2B
24
2C
25
2D
26
2E
27
2F
28
30
29
31
30
32
31
33
32
34
33
35
34
36
35
37
36
38
38
3A
39
3B
40
3C
41
3D
42
3E
43
3F
44
40
45
41
15
Cassette and convertible
indoor display outdoor error
code use the timer and runing
lamp
Timer lamp
Running lamp
flash time
flash time
2
1
2
2
2
4
2
5
2
6
2
8
2
9
3
0
3
1
3
2
3
3
3
5
3
6
3
7
3
8
4
0
4
1
4
3
4
4
4
5
4
6
4
7
4
8
4
9
5
0
5
1
5
2
5
3
5
4
5
5
5
6
5
8
5
9
6
0
6
1
6
2
6
3
6
4
6
5
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