Hewalex
Hewalex 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
The pool heat pump does not start; the display shows E01 shortly after power-up.
High Pressure Protection (HP switch open)
E02
The pool heat pump stops heating and displays E02; the unit may attempt to restart but trips again.
Low Pressure Protection (LP switch open)
E03
The Hewalex pool heater powers on but the compressor does not start; the display shows E03.
Compressor Overload / Thermal Protection
E04
The unit stops and displays E04; the fan may continue briefly then shut down.
Water Flow Protection / Flow Switch Open
E05
The display shows E05 and heating stops; the unit may start and stop repeatedly.
Water Inlet Temperature Sensor Fault (NTC open/short)
E06
The display shows E06; the unit will not start heating or stops shortly after starting.
Water Outlet Temperature Sensor Fault (NTC open/short)
E07
The unit displays E07 and stops; the fan may run, but the compressor does not.
Ambient Air Temperature Sensor Fault
E08
The display shows E08; the unit may start but shuts down quickly.
Evaporator Coil Temperature Sensor Fault
E09
The Hewalex pool heater displays E09 and will not run the compressor.
Defrost Sensor / Coil Frost Protection Fault
E10
The display shows E10; the unit does not respond to commands or stops unexpectedly.
Communication Error Between Main PCB and Display/Remote Controller
E11
The unit displays E11 and will not start; this sometimes occurs after a power surge.
EEPROM / Parameter Memory Error
E12
The display shows E12; the unit may start but quickly stops with an alarm.
Phase / Power Supply Error (for 3‑phase models)
E13
The Hewalex pool heater displays E13 and shuts down; this may be accompanied by unusual compressor noise.
Compressor Overcurrent / Inverter Protection (for inverter models)
E14
The display shows E14; the fan does not start or stops abruptly.
Fan Motor Fault / Fan Feedback Error
E15
The unit displays E15 and stops; this may occur during defrost or low ambient operation.
Defrost Failure / Defrost Timeout
E16
The display shows E16; the heater does not start and may indicate low ambient conditions.
Low Ambient Lockout / Outside Temperature Below Operating Range
E17
Hewalex pool heater shows E17; the unit may run but with limited performance or stops intermittently.
Water Temperature Differential Too High / Flow Imbalance
E18
Display shows E18; the unit may not respond to keypad inputs.
Keypad / User Interface Fault
E19
The unit shows E19 and stops; this may be associated with internal water leak detection (if equipped).
Internal Leak / Condensate Overflow Alarm
E20
Display shows E20; the heater does not start and may indicate an open safety chain.
General Safety Circuit Open (Emergency Stop / Door Switch / Flow Chain)
Symptom
Corrosion or rust visible on metal parts of the heater, especially near water connections.
Corrosion / Environmental Degradation
Symptom
Display is on but buttons do not respond or respond intermittently.
User Interface Input Failure
Symptom
Display shows unrealistic water temperature (e.g., 0°C or 60°C) while pool feels normal.
Water Temperature Measurement Error
Symptom
Fan runs but little or no air is moving through the coil; airflow feels weak.
Restricted Airflow / Fan Performance Issue
Symptom
Pool heater causes noticeable vibration transmitted to the ground or mounting surface.
Unit Vibration / Mounting Issue
Symptom
Pool heater runs but occasionally shuts down with no code, then restarts later on its own.
Intermittent Thermal or Flow Protection Trip
Symptom
Pool heater runs but pool water does not reach the set temperature or heats very slowly.
Insufficient Heating Capacity / Performance Degradation
Symptom
Strong chemical or burning smell around the pool heater during operation.
Overheating Component / Electrical Insulation Breakdown
Symptom
The Hewalex pool heater is running but makes loud banging, knocking, or metallic noises.
Mechanical Vibration / Internal Component Looseness
Symptom
The pool heater does not start at all; the display is blank and the unit appears dead.
No Power / Control Circuit Dead
Symptom
The unit powers on but the compressor never starts; the fan may run continuously without heating.
Compressor Start Failure
Symptom
The unit produces a high‑pitched whine or electrical buzzing during operation.
Electrical Noise / Coil or Inverter Whine
Symptom
Unit frequently cycles on and off in short intervals (short cycling).
Control or Hydraulic Short Cycling
Symptom
Unit frequently enters defrost mode and spends long periods defrosting, reducing heating time.
Excessive Defrost Frequency
Symptom
Unit trips the main circuit breaker or RCD when starting or during operation.
Electrical Short Circuit / Earth Leakage
Symptom
Water leaking from the base of the Hewalex pool heater onto the ground.
External Water Leak / Condensate Misidentification
| Error Code | Symptom | Fault Type | Guide |
|---|---|---|---|
| E01 |
The pool heat pump does not start; the display shows E01 shortly after power-up.
|
High Pressure Protection (HP switch open) | View Details |
| E02 |
The pool heat pump stops heating and displays E02; the unit may attempt to restart but trips again.
|
Low Pressure Protection (LP switch open) | View Details |
| E03 |
The Hewalex pool heater powers on but the compressor does not start; the display shows E03.
|
Compressor Overload / Thermal Protection | View Details |
| E04 |
The unit stops and displays E04; the fan may continue briefly then shut down.
|
Water Flow Protection / Flow Switch Open | View Details |
| E05 |
The display shows E05 and heating stops; the unit may start and stop repeatedly.
|
Water Inlet Temperature Sensor Fault (NTC open/short) | View Details |
| E06 |
The display shows E06; the unit will not start heating or stops shortly after starting.
|
Water Outlet Temperature Sensor Fault (NTC open/short) | View Details |
| E07 |
The unit displays E07 and stops; the fan may run, but the compressor does not.
|
Ambient Air Temperature Sensor Fault | View Details |
| E08 |
The display shows E08; the unit may start but shuts down quickly.
|
Evaporator Coil Temperature Sensor Fault | View Details |
| E09 |
The Hewalex pool heater displays E09 and will not run the compressor.
|
Defrost Sensor / Coil Frost Protection Fault | View Details |
| E10 |
The display shows E10; the unit does not respond to commands or stops unexpectedly.
|
Communication Error Between Main PCB and Display/Remote Controller | View Details |
| E11 |
The unit displays E11 and will not start; this sometimes occurs after a power surge.
|
EEPROM / Parameter Memory Error | View Details |
| E12 |
The display shows E12; the unit may start but quickly stops with an alarm.
|
Phase / Power Supply Error (for 3‑phase models) | View Details |
| E13 |
The Hewalex pool heater displays E13 and shuts down; this may be accompanied by unusual compressor noise.
|
Compressor Overcurrent / Inverter Protection (for inverter models) | View Details |
| E14 |
The display shows E14; the fan does not start or stops abruptly.
|
Fan Motor Fault / Fan Feedback Error | View Details |
| E15 |
The unit displays E15 and stops; this may occur during defrost or low ambient operation.
|
Defrost Failure / Defrost Timeout | View Details |
| E16 |
The display shows E16; the heater does not start and may indicate low ambient conditions.
|
Low Ambient Lockout / Outside Temperature Below Operating Range | View Details |
| E17 |
Hewalex pool heater shows E17; the unit may run but with limited performance or stops intermittently.
|
Water Temperature Differential Too High / Flow Imbalance | View Details |
| E18 |
Display shows E18; the unit may not respond to keypad inputs.
|
Keypad / User Interface Fault | View Details |
| E19 |
The unit shows E19 and stops; this may be associated with internal water leak detection (if equipped).
|
Internal Leak / Condensate Overflow Alarm | View Details |
| E20 |
Display shows E20; the heater does not start and may indicate an open safety chain.
|
General Safety Circuit Open (Emergency Stop / Door Switch / Flow Chain) | View Details |
| – |
Corrosion or rust visible on metal parts of the heater, especially near water connections.
|
Corrosion / Environmental Degradation | View Details |
| – |
Display is on but buttons do not respond or respond intermittently.
|
User Interface Input Failure | View Details |
| – |
Display shows unrealistic water temperature (e.g., 0°C or 60°C) while pool feels normal.
|
Water Temperature Measurement Error | View Details |
| – |
Fan runs but little or no air is moving through the coil; airflow feels weak.
|
Restricted Airflow / Fan Performance Issue | View Details |
| – |
Pool heater causes noticeable vibration transmitted to the ground or mounting surface.
|
Unit Vibration / Mounting Issue | View Details |
| – |
Pool heater runs but occasionally shuts down with no code, then restarts later on its own.
|
Intermittent Thermal or Flow Protection Trip | View Details |
| – |
Pool heater runs but pool water does not reach the set temperature or heats very slowly.
|
Insufficient Heating Capacity / Performance Degradation | View Details |
| – |
Strong chemical or burning smell around the pool heater during operation.
|
Overheating Component / Electrical Insulation Breakdown | View Details |
| – |
The Hewalex pool heater is running but makes loud banging, knocking, or metallic noises.
|
Mechanical Vibration / Internal Component Looseness | View Details |
| – |
The pool heater does not start at all; the display is blank and the unit appears dead.
|
No Power / Control Circuit Dead | View Details |
| – |
The unit powers on but the compressor never starts; the fan may run continuously without heating.
|
Compressor Start Failure | View Details |
| – |
The unit produces a high‑pitched whine or electrical buzzing during operation.
|
Electrical Noise / Coil or Inverter Whine | View Details |
| – |
Unit frequently cycles on and off in short intervals (short cycling).
|
Control or Hydraulic Short Cycling | View Details |
| – |
Unit frequently enters defrost mode and spends long periods defrosting, reducing heating time.
|
Excessive Defrost Frequency | View Details |
| – |
Unit trips the main circuit breaker or RCD when starting or during operation.
|
Electrical Short Circuit / Earth Leakage | View Details |
| – |
Water leaking from the base of the Hewalex pool heater onto the ground.
|
External Water Leak / Condensate Misidentification | View Details |
No matching codes found
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