Pentair eco select ULTRATEMP HX Series Owner's Manual page 29

Code Failure
Er03 Water flow switch failure
Er04 Anti-freeze protection in
winter
Er05 High pressure protection
Er06 Low pressure protection
Er09 Communication Fail
Er12 High compressor exhaust
gas temp protection
Er15 Inlet water temp sensor
failure
Er16 Coil temp sensor failure
Er18 Compressor exhaust gas
temp. sensor failure
Maintenance & Troubleshooting
Possible reasons
1) Inadequate water flow
2) Water flow switch dam-
aged
3) Main PCB damaged
This function occurs when
ambient temp is too low.
1) Inadequate flow rate
2) Uncompressed gas in
refrigerant system
3) Overcharge with refrig-
erant
4) Water temp setting too
high
5) Poor connection of pres-
sure switch
6) Pressure switch failure
7) Main PCB damaged
1) Undercharged refrigerant
2) Capillary block
3) Poor connection of pres-
sure switch
4) Pressure switch failure
5) Main PCB damaged
Communication failure be-
tween the LCD and PCB
1) Refrigerant Under-
charged
2) Possible reasons as Er05
1) Sensor open circuit
2) Sensor short circuit
3) Main PCB damaged
1) Sensor open circuit
2) Sensor short circuit
3) Main PCB damaged
1) Sensor open circuit
2) Sensor short circuit
3) Main PCB damaged
Page 29
Remedy
1) Check the pump
2) Replace the water flow
switch
3) Replace the PCB
No action needed
1) Check pump and water
control valve
2) Discharge and then re-
charge the refrigerant
3) Discharge some refrig-
erant
4) Set lower water temp
5) Reconnect the switch
6) Replace the pressure
switch
7) Replace the PCB
1) Add some refrigerant
2) Replace the capillary
3) Reconnect the switch
4) Replace the pressure
switch
5) Replace the PCB
1) Check the wire connec-
tion between the LCD and
PCB.
2) Replace LCD.
1) Add some refrigerant
2) Similar corrections as
Er05
1) Check the sensor con-
nection
2) Replace the sensor
3) Replace the main PCB
1) Check the sensor con-
nection
2) Replace the sensor
3) Replace the main PCB
1) Check the sensor con-
nection
2) Replace the sensor
3) Replace the main PCB