BWT
BWT Pool Heaters Error Codes
Complete list of fault codes and troubleshooting guides. Use the search below to find your specific error.
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E01
Pool heater will not start; display shows E01 shortly after power-up
Low Water Flow Protection Triggered
E02
BWT pool heater stops heating and displays E02 after running for a short time
High Water Temperature / Overheat Protection
E03
Heater display shows E03 and the compressor does not start
Low Refrigerant Pressure Protection
E04
Heater runs briefly then stops with E04 on the display
High Refrigerant Pressure Protection
E05
Display shows E05 and heater will not start heating cycle
Water Inlet Temperature Sensor Fault (NTC1)
E06
Heater shows E06 and stops operation; may start then quickly shut down
Water Outlet Temperature Sensor Fault (NTC2)
E07
Heater displays E07 and will not run the compressor
Ambient Air Temperature Sensor Fault
E08
Display shows E08; heater may run pump but not compressor
Evaporator Coil Temperature Sensor Fault / Anti-Freeze Sensor Error
E09
Heater shows E09 and shuts down; may occur during defrost or cold weather
Anti-Freeze / Low Evaporator Temperature Protection
E10
Heater display shows E10 and unit will not start
Water Flow Switch Open / Flow Switch Circuit Error
E11
Heater shows E11 and does not respond to thermostat changes
Water Temperature Sensor Calibration / Range Error
E12
Heater display shows E12; unit may run pump but not heat
Communication Error Between Display Panel and Main Control Board
E13
Heater shows E13 and stops; may be accompanied by unusual compressor noise
Compressor Overload / Overcurrent Protection
E14
Heater displays E14 and does not start; fan may run briefly
Fan Motor Fault / Fan Feedback Error
E15
Heater shows E15 and will not operate; may occur after a power surge
Internal Control Board Fault / EEPROM Error
E16
Heater intermittently shuts down with E16; may coincide with unstable mains power
Supply Voltage Out of Range
E17
Heater shows E17; unit may start but quickly stops heating
Refrigerant Discharge Temperature Too High
E18
Heater displays E18 and does not start compressor; fan may run
Defrost System Fault
E19
Heater shows E19 and will not start; may occur after incorrect wiring
Phase Sequence / Phase Loss Error (Three-Phase Models)
E20
Heater intermittently shows E20 and stops; may coincide with communication to external controller
External Control / BMS Communication Fault
Symptom
Display shows normal operation but pool water temperature does not change over time
Apparent No Heating Despite Indicated Operation
Symptom
Heater cabinet panels rattle or buzz during operation
Loose Panel / Structural Vibration Noise
Symptom
Heater causes the circuit breaker to trip when starting or during operation
Electrical Overload or Short Circuit
Symptom
Heater does not start when pool pump is running and there is a call for heat
No Heat Demand Recognition
Symptom
Heater emits a strong chemical or burning smell during operation
Overheating Electrical Component or Contaminant on Coil
Symptom
Heater frequently goes into defrost mode and heating output is low
Excessive Defrost Cycling
Symptom
Heater frequently stops with no code when pump speed is reduced (variable-speed pump)
Inadequate Flow at Low Pump Speed
Symptom
Heater is running but makes loud rattling or grinding noises
Mechanical Noise from Fan or Compressor
Symptom
Heater powers on but does not respond to buttons or touch controls
Unresponsive User Interface / Keypad Failure
Symptom
Heater runs but pool water becomes too hot and overshoots the set temperature
Overheating / Thermostat Overshoot
Symptom
Heater starts then shuts off after a few minutes without any error code
Short Cycling / Premature Shutdown
Symptom
Heater vibrates excessively and may cause piping or base to shake
Excessive Vibration
Symptom
Heater will not start at all; display is blank and unit appears dead
No Power / Dead Control Panel
Symptom
Pool heater runs but water does not reach set temperature or heats very slowly
Insufficient Heating Capacity / Performance Degradation
Symptom
Visible ice buildup on the evaporator coil or around the base of the heater
Coil Icing / Inadequate Defrost
Symptom
Water leaking from the base of the BWT pool heater
External Water Leak
| Error Code | Symptom | Fault Type | Guide |
|---|---|---|---|
| E01 |
Pool heater will not start; display shows E01 shortly after power-up
|
Low Water Flow Protection Triggered | View Details |
| E02 |
BWT pool heater stops heating and displays E02 after running for a short time
|
High Water Temperature / Overheat Protection | View Details |
| E03 |
Heater display shows E03 and the compressor does not start
|
Low Refrigerant Pressure Protection | View Details |
| E04 |
Heater runs briefly then stops with E04 on the display
|
High Refrigerant Pressure Protection | View Details |
| E05 |
Display shows E05 and heater will not start heating cycle
|
Water Inlet Temperature Sensor Fault (NTC1) | View Details |
| E06 |
Heater shows E06 and stops operation; may start then quickly shut down
|
Water Outlet Temperature Sensor Fault (NTC2) | View Details |
| E07 |
Heater displays E07 and will not run the compressor
|
Ambient Air Temperature Sensor Fault | View Details |
| E08 |
Display shows E08; heater may run pump but not compressor
|
Evaporator Coil Temperature Sensor Fault / Anti-Freeze Sensor Error | View Details |
| E09 |
Heater shows E09 and shuts down; may occur during defrost or cold weather
|
Anti-Freeze / Low Evaporator Temperature Protection | View Details |
| E10 |
Heater display shows E10 and unit will not start
|
Water Flow Switch Open / Flow Switch Circuit Error | View Details |
| E11 |
Heater shows E11 and does not respond to thermostat changes
|
Water Temperature Sensor Calibration / Range Error | View Details |
| E12 |
Heater display shows E12; unit may run pump but not heat
|
Communication Error Between Display Panel and Main Control Board | View Details |
| E13 |
Heater shows E13 and stops; may be accompanied by unusual compressor noise
|
Compressor Overload / Overcurrent Protection | View Details |
| E14 |
Heater displays E14 and does not start; fan may run briefly
|
Fan Motor Fault / Fan Feedback Error | View Details |
| E15 |
Heater shows E15 and will not operate; may occur after a power surge
|
Internal Control Board Fault / EEPROM Error | View Details |
| E16 |
Heater intermittently shuts down with E16; may coincide with unstable mains power
|
Supply Voltage Out of Range | View Details |
| E17 |
Heater shows E17; unit may start but quickly stops heating
|
Refrigerant Discharge Temperature Too High | View Details |
| E18 |
Heater displays E18 and does not start compressor; fan may run
|
Defrost System Fault | View Details |
| E19 |
Heater shows E19 and will not start; may occur after incorrect wiring
|
Phase Sequence / Phase Loss Error (Three-Phase Models) | View Details |
| E20 |
Heater intermittently shows E20 and stops; may coincide with communication to external controller
|
External Control / BMS Communication Fault | View Details |
| – |
Display shows normal operation but pool water temperature does not change over time
|
Apparent No Heating Despite Indicated Operation | View Details |
| – |
Heater cabinet panels rattle or buzz during operation
|
Loose Panel / Structural Vibration Noise | View Details |
| – |
Heater causes the circuit breaker to trip when starting or during operation
|
Electrical Overload or Short Circuit | View Details |
| – |
Heater does not start when pool pump is running and there is a call for heat
|
No Heat Demand Recognition | View Details |
| – |
Heater emits a strong chemical or burning smell during operation
|
Overheating Electrical Component or Contaminant on Coil | View Details |
| – |
Heater frequently goes into defrost mode and heating output is low
|
Excessive Defrost Cycling | View Details |
| – |
Heater frequently stops with no code when pump speed is reduced (variable-speed pump)
|
Inadequate Flow at Low Pump Speed | View Details |
| – |
Heater is running but makes loud rattling or grinding noises
|
Mechanical Noise from Fan or Compressor | View Details |
| – |
Heater powers on but does not respond to buttons or touch controls
|
Unresponsive User Interface / Keypad Failure | View Details |
| – |
Heater runs but pool water becomes too hot and overshoots the set temperature
|
Overheating / Thermostat Overshoot | View Details |
| – |
Heater starts then shuts off after a few minutes without any error code
|
Short Cycling / Premature Shutdown | View Details |
| – |
Heater vibrates excessively and may cause piping or base to shake
|
Excessive Vibration | View Details |
| – |
Heater will not start at all; display is blank and unit appears dead
|
No Power / Dead Control Panel | View Details |
| – |
Pool heater runs but water does not reach set temperature or heats very slowly
|
Insufficient Heating Capacity / Performance Degradation | View Details |
| – |
Visible ice buildup on the evaporator coil or around the base of the heater
|
Coil Icing / Inadequate Defrost | View Details |
| – |
Water leaking from the base of the BWT pool heater
|
External Water Leak | View Details |
No matching codes found
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