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195
TROUBLESHOOTING
18K, 24k and 36k outdoor Fault Codes
Fault
code
Fault D escription Possible Reason of A bnormality How to Deal With Remarks
24
Expansion valve B
(thin)tube sensor fault
1. The wiring of the sensor for the
expansion valve B (thin tube)
connect loose;
2.The sensor for the expansion valve
B(thin tube) is failure;
3.The sampling circuit is abnormally
25
Expansion valve C
(thin)tube sensor fault
1. Reconnect the wiring of the
sensor for the expansion valve
B(thin tube);
2.Replace the sensor for th e
expansion valve B(thin tube);
3. Replace the outdoor control
board.
1. The wiring of the sensor for the
expansion valve C(thin tube)
connect loose;
2.The sensor of the expansion valve
C （thin tube ）is failure;
3.The sampling circuit is abnormally
26
Expansion valve D
(thin)tube sensor fault
1. Reconnect the wiring of the
sensor for th e expansion valve
C(thin tube);
2. Replace the sensor for th e
expansion valve C(thin tube);
3. Replace the outdoor control
board.
1.The wiring of the sensor for the
expansion valve D(thin tube)
connect loose;
2.The sensor of the expansion valve
D (thin tube) is failure;
3.The sampling circuit is abnormally
27
Expansion valve A
（ thick
tube）sensor fault
1. Reconnect the wiring of the
sensor for the expansion valve
D(thin tube);
2. Replace the sensor for the
expansion valve D (thin tube);
3. Replace the outdoor control
board.
1. The wiring of the sensor for the
expansion valve A (thick tube)
connect loose;
2.The sensor of the expansion valve
A (thick tube) is failure;
3.The sampling circuit is abnormally
28
Expansion valve B
（ thick
tube） sensor fault
1. Reconnect the wiring of the
sensor for the expansion valve
A (thick tube);
2. Replace the sensor for the
expansion valve A (thick tube);
3. Replace the outdoor control
board.
1. The wiring of the sensor for the
expansion valve B (thick tube)
connect loose;
2. The sensor of the expansion valve
B (thick tube) is failure;
3. The sampling circuit is abnormally
29
Expansion valve C
(thick
tube) sensor fault
1. Reconnect the wiring of the
sensor for the expansion valve
B(thick tube);
2. Replace the sensor for the
expansion valve B (thick tube);
3. Replace the outdoor control
board.
1. The wiring of the sensor for the
expansion valve B(thick tube)
connect loose;
2. The sensor of the expansion valve
C (thick tube) is failure;
3. The sampling circuit is abnormally
30
Expansion valve D
(thick
tube) sensor fault
1. Reconnect the wiring of the
sensor for the expansion valve
B (thick tube);
2. Replace the sensor for the
expansion valve C (thick tube);
3. Replace the outdoor control
board.
1. The wiring of the sensor for the
expansion valve B(thick tube)
connect loose;
2.The sensor of the expansion valve
D (thick tube) is failure;
3. The sampling circuit is abnormally
45 IPM fault
1. Reconnect the wiring of the
sensor for the expansion valve
B (thick tube);
2. Replace the sensor for the
expansion valve D (thick tube);
3. Replace the outdoor control
board.
See attached "analysis of the
driving board fault".
There are many reasons for this
failure, If you need further analysis ,
fault code of the driver board is
needed by watching the driver board
fault led. Analysis can be further to
know why and how to operate.
Specific see table 5, table 6.
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