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19 Troubleshooting
19.1 Error Code: Overview
If an error code is displayed on the controller, contact the installation personnel and inform them of the error code, unit model,
and serial number (you can find the information on the nameplate of Unit).
Table 19-1 (8/10/12/14/16 kW) Error Codes of ODU
No.
Description
Requiring
manual restart
Error code
1
Communication error between main control board and switch module
No
C0
2
System combination fault
Yes
U2
3
Communication error between IDU and ODU
No
E2
4
T3 or T4 temperature sensor error
No
E4
5
Input voltage protection
No
E5
6
DC fan protection
No
E6
7
E6 fault occurring at least 6 times in 1 hour
Yes
Eb
8
EEPROM fault
Yes
E9
9
Wrong compressor parameters
Yes
E.9.
10
PFC feedback resistance fault
Yes
EF
11
Refrigerant radiator temperature sensor fault
No
EH
12
Cooling ambient temperature lower than -16°C
No
EP
13
DC bus voltage protection
No
F1
14
L (L0/L1) fault occurring 3 times in 1 hour
Yes
H4
15
Online IDU quantity decrease/increase
No
H7
16
Radiator surface temperature protection
No
PL
17
System high pressure protection
No
P1
18
System low pressure protection
No
P2
19
Overcurrent protection
No
P3
20
Discharge temperature T5 protection
No
P4
21
Outdoor condenser temperature T3 protection
No
P5
22
4-way valve direction change fault
No
P9
23
IDU evaporator temperature T2 protection
No
PE
24
Abnormal condensation protection
No
Ph
25
Condensation protection
Yes
Pd
26
IPM protection
No
L0
27
DC bus low voltage protection
No
L1
28
DC bus high voltage protection
No
L2
29
Other drive faults
No
L3
30
MCE fault
No
L4
31
Zero speed protection
No
L5
32
Compressor phase sequence fault
No
L7
If the problem remains, please contact your distributor or Kaysun's air conditioner customer service center, and provide info
about the product model and the fault details.
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