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n) Error Codes Display
When the unit is facing operational problem, the “Error codes display area” will display error codes to
indicate the problem detected the interpretation of the codes are as following:
Error Code
Description
Setting
1
Power supply fault
Wrong phase, over/under voltage
2
Low water flow error - system
If water temperature difference >9°C (FCA301 only)
3
Reserved
-
4
Ambient temperature sensor (TH7) error
Ambient sensor open/short
5
Entering water temperature sensor (TH6) error
Entering water temperature sensor open/short
6
Leaving water temperature sensor (TH5) error
Leaving water temperature sensor open/short
7
External alarm_in
External interlock open
8
Flow switch open
Flow switch open
9
Circuit #1 compressor overload
Compressor overload protection #1 open
10
Circuit #1 low pressure trip - Heating
Low pressure switch - Heating #1 open
11
Circuit #1 low leaving water temperature
Leaving water temperature #1 ≤5°C (Cool mode only)
12
Circuit #1 high leaving water temperature
Leaving water temperature #1 ≥55°C (Heat mode only)
13
Circuit #1 condenser temperature sensor (TH1) error Outdoor coil sensor open/short
14
Water temperature sensor (TH3) error
Water temperature sensor (TH3) open/short
15
Circuit #1 low pressure trip - Cooling
Low pressure switch - Cooling #1 open
16
Circuit #1 high pressure trip
High pressure #1 switch open
17
Circuit #2 compressor overload
Compressor overload protection #1 open
18
Circuit #2 low pressure trip - Heating
Low pressure switch - Heating #2 open
19
Circuit #2 low leaving water temperature
Leaving water temperature #2 ≤5°C (Cool mode only)
20
Circuit #2 high leaving water temperature
Leaving water temperature#2 ≥55°C (Heat mode only)
21
Circuit #2 condenser temperature sensor (TH2) error
Outdoor coil sensor #2 open/short
22
Water temperature sensor (TH4) error
Water temperature sensor (TH4) open/short
23
Circuit #2 low pressure trip - Cooling
Low pressure switch - Cooling #2 open
24
Circuit #2 high pressure trip
High pressure switch #2 open
Note:
1. Auto reset type – System will recover 5 minutes after particular alarm contact is closed.
2. Manual reset type – Press and hold <CLEAR> key after troubleshooting.
3. Water flow error and power supply error can be reset by restarting the system.
