20
Error codes and Troubleshooting
When an error occurs or the protection mode is set automatically, the wired controller will display the error message.
Protection/
Malfunction
Error code
Reasons
Correction Mode
Phase Dislocation
Er01
Wrong connection of live
wire
Reverse position of two of the
live wires (3-Phase only).
Phase Loss
Er02
Live wire loose, or without
power.
1)
Check if wires are loose.
2)
Check if any phase is without
power (use a multimeter to check
voltage).
Water flow switch
failure
Er03
1)
Inadequate water flow
2)
Water flow switch dam-
aged
3)
Main PCB damaged
1)
Check the pump
2)
Replace the water flow
switch
3)
Replace the PCB
Anti-freeze
protection in
winter
Er04
This function occurs when
ambient temperature is too low.
No action needed
High pressure
protection
Er05
1)
Inadequate flow rate
2)
Uncompressed gas in
refrigerant system
3)
Overcharge with
refrigerant
4)
Water temperature
setting too high
5)
Outdoor fan ventilation is
bad
6)
Poor connection of pressure
switch
7)
Pressure switch failure
8)
Main PCB damaged
1)
Check pump and water
control valve
2)
Discharge and then re-
charge the refrigerant
3)
Discharge some
refrigerant
4)
Set lower water temp
5)
Check fan ventilation
6)
Reconnect the switch
7)
Replace the pressure
switch
8)
Replace the PCB
Low pressure
protection
Er06
1)
Undercharged refrigerant
2)
Capillary or EEV blocked
3)
Poor connection of pressure
switch
4)
Pressure switch failure
5)
Main PCB damaged
1)
Add some refrigerant
2)
Replace the capillary or EEV
3)
Reconnect the switch
4)
Replace the pressure
switch
5)
Replace the PCB
Communication failure Er09
Communication failure be-
tween the LCD and PCB
1)
Check the wire connection
between the LCD and PCB.
2)
Replace LCD.
High compressor
exhaust gas
temperature
protection
Er12
1)
Refrigerant Under-
charged
2)
Reasons as Er05
1)
Add some refrigerant
2)
Similar corrections as Er05
Tank water
temperature sensor
failure
Er15
1)
Sensor open circuit
2)
Sensor short circuit
3)
Main PCB damaged
1)
Check the sensor
connection
2)
Replace the sensor
3)
Replace the main PCB
Coil temperature
sensor failure
Er16
1)
Sensor open circuit
2)
Sensor short circuit
3)
Main PCB damaged
1)
Check the sensor
connection
2)
Replace the sensor
3)
Replace the main PCB