I&O manual
23
8. MAINTENANCE AND UPKEEP
8.1 Failure information and code
In case the unit runs under abnormal condition, failure
protection code will display on both control panel and wired
controller, and the indicator on the wired controller will flash
with 1Hz. The display codes are shown in the following table:
Table 8-1
No.
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
Code
Reason
EEPROM error of main control board
EEPROM error of inverter module A
EEPROM error of inverter module B
Total water outlet temperature sensor error(master only)
Outlet water temp sensor error
Condenser tube temperature sensor error
System self check fault alarm
Discharge pipe temperature sensor error alarm
Total cooling outlet temperature sensor(Tz) error
High pressure or air discharge temperature protection
(protection occurs for 5 times in 120 minutes and the
failure can be recovered by power disconnection only)
Low pressure protection(protection occurs for 5 times in 120 minutes
and the failure can be recovered by power disconnection only)
System A Current protection(protection occurs for 5 times
in 120 minutes and the failure can be recovered by power
disconnection only)
System B Current protection (protection occurs for 5 times
in 120 minutes and the failure can be recovered by power
disconnection only)
Protection of outlet and inlet water temperature difference(protection
occurs for 3 times in 60 minutes and the failure can be recovered by
power
System self- check error alarm
Outdoor ambient temperature sensor error
Outdoor ambient temperature sensor error
Inlet water temperature sensor error
Evaporator anti-freezing temperature sensor (T62)error
Communication error between main control board and wired controller
Power phase sequence error
P1
P0
1E0
E1
E2
E3
E4
E5
E7
E8
E9
1Eb
1Ed
2Ed
1P6
2P6
EC
EF
EH
EP
EU
2E0
3E0
P4
P5
P9
Condenser high temperature protection
Inlet water high temperature in cooling mode
System anti-freezing protection
PA
Pb
System B discharge pipe temperature sensor error
P7
System A inverter module protection
System A discharge pipe temperature sensor error
System A inverter module protection
Outdoor ambient temperature sensor error
Tfin module high temperature protection(Protection occurs for
3 times in 100 minutes and the failure can be recovered by
power disconnection only)
DC fan A module protection
DC fan B module protection
PL
33
32
31
28
29
30
34
35
36
37
38
39
40
41
42
43
44
45
46
47
System A IPM module Communication error
System B IPM module Communication error
Under/Over voltage protection
System A DC bus voltage error
System B DC bus voltage error
Pressure sensor error
DC bus low voltage protection
DC bus high voltage protection
MCE error
Zero speed protection
Phase sequence error
DC fan A error
Air suction temperature protection error
Heat recovery temperature sensor error
Inverter module protection
Three times 2PP protection within one hour (power off recovery)
Three times 1PP protection within one hour (power off recovery)
L7
Compressor frequency variation greater than 15Hz
within one second protection
L8
Actual compressor frequency differs from target
frequency by more than 15Hz protection
L9
Defrosting prompt
dF
1H0
2H0
H1
1H4
2H4
1H6
2H6
Fb
Fd
FE
1FF
2FF
FP
L0
L1
L2
L4
L5
1PU
2PU
DIP inconsistency of multiple water pumps(Power
failure recovery required)
DC fan B error
25
26
27
Evaporator pressure low in cooling mode
PC
Low-temperature protection of evaporator (manual recovery)
PE
T4 high temperature protection in heating mode
PH
