51
Troubleshooting
17 fault input alarm switches, 1 fault output alarm switch and 1 operating status output switch are arranged for the
double-compressor system.
No.
Input Port
Fault Description
Type
Code
Fault Handling
1
TH1
Short circuit / open circuit of water inlet
temperature sensor
A
SE
Turn off all external devices
2
TH2
Short circuit / open circuit of water
outlet temperature sensor
A
SL
Turn off all external devices
3
TH3
Short circuit / open circuit of suction
temperature sensor 1
A
Sd
Turn off all external devices
4
TH4
Short circuit / open circuit of defrosting
temperature sensing sensor 1
A
S1
Turn off all external devices
5
TH5
Short circuit / open circuit of defrosting
temperature sensing sensor 2
A
S2
Turn off all external devices
6
TH6
Short circuit / open circuit of suction
temperature sensor 2
A
S3
Turn off all external devices
7
OVHT/HP2
High pressure alarm of compressor 2
E
H2
Only switch off the compressor
2
8
FLOW
Lack of water flow
D
FL
Turn off all external devices
9
OV-PUMP
Overload of water pump 1
B
OP
Turn off all external devices
10
OV-FAN
Overload of fan
B
OF
Turn off all external devices
11
OV-COMP1
Overload of compressor 1
C
C1
Only switch off the compressor
1
12
OV-COMP2
Overload of compressor 2
E
C2
Only switch off the compressor
2
13
HP1
High pressure voltage of compressor 1
C
H1
Only switch off the compressor
1
14
LP1
Low pressure voltage of compressor 1
C
L1
Only switch off the compressor
1
15
FREZ/LP2
Low pressure voltage of compressor 2
E
L2
Only switch off the compressor
2
16
/ / /
Low refrigeration water outlet
temperature
D
E3
Switch off the compressor. The
auxiliary heater for the water
pump operates.
17
/ / /
Low suction temperature
D
E4
Switch off the compressor. The
auxiliary heater for the water
pump operates.
