50
Troubleshooting
Fault Alarm Table for Controller (N Type)
If the single unit controller and the control panel are faulty, the code
“
EE
”
will be
displayed.
13 fault input alarm switches and 1 fault output alarm switch are arranged for the single-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
A
S1
Turn off all external devices
5
OVHT/HP2
Overload of electrical heater
B
H2
Turn off all external devices
6
FLOW
Lack of water flow
D
FL
Turn off all external devices
7
OV-PUMP
Overload of water pump
B
OP
Turn off all external devices
8
OV-FAN
Overload of fan
B
OF
Turn off all external devices
9
OV-COMP1
Overload of compressor 1
C
C1
Only switch off the compressor
1
10
HP1
High pressure alarm of compressor 1
C
H1
Only switch off the compressor
1
11
LP1
Low pressure alarm of compressor 1
C
L1
Only switch off the compressor
1
12
/ / /
Low refrigeration water outlet
temperature
D
E3
Switch off the compressor. The
auxiliary heater for the water
pump operates.
13
/ / /
Low suction temperature
D
E4
Switch off the compressor. The
auxiliary heater for the water
pump operates.
