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
Pool heat pump does not start; display shows E01 shortly after power-up.
High Pressure Protection (HP switch open)
E02
Pool heat pump stops heating and displays E02; unit may attempt to restart but trips again.
Low Pressure Protection (LP switch open)
E03
Hewalex pool heater powers on but compressor does not start; display shows E03.
Compressor Overload / Thermal Protection
E04
Unit stops and displays E04; fan may continue briefly then shut down.
Water Flow Protection / Flow Switch Open
E05
Display shows E05 and heating stops; unit may start and stop repeatedly.
Water Inlet Temperature Sensor Fault (NTC open/short)
E06
Display shows E06; unit will not start heating or stops shortly after start.
Water Outlet Temperature Sensor Fault (NTC open/short)
E07
Unit shows E07 and stops; fan may run but compressor does not.
Ambient Air Temperature Sensor Fault
E08
Display shows E08; unit may start but shuts down quickly.
Evaporator Coil Temperature Sensor Fault
E09
Hewalex pool heater shows E09 and will not run the compressor.
Defrost Sensor / Coil Frost Protection Fault
E10
Display shows E10; unit does not respond to commands or stops unexpectedly.
Communication Error Between Main PCB and Display/Remote Controller
E11
Unit shows E11 and will not start; sometimes occurs after a power surge.
EEPROM / Parameter Memory Error
E12
Display shows E12; unit may start but quickly stops with alarm.
Phase / Power Supply Error (for 3‑phase models)
E13
Hewalex pool heater shows E13 and shuts down; may be accompanied by unusual compressor noise.
Compressor Overcurrent / Inverter Protection (for inverter models)
E14
Display shows E14; fan does not start or stops abruptly.
Fan Motor Fault / Fan Feedback Error
E15
Unit displays E15 and stops; may occur during defrost or low ambient operation.
Defrost Failure / Defrost Timeout
E16
Display shows E16; heater does not start and may indicate low ambient conditions.
Low Ambient Lockout / Outside Temperature Below Operating Range
E17
Hewalex pool heater shows E17; unit may run but with limited performance or stops intermittently.
Water Temperature Differential Too High / Flow Imbalance
E18
Display shows E18; unit may not respond to keypad inputs.
Keypad / User Interface Fault
E19
Unit shows E19 and stops; may be associated with internal water leak detection (if equipped).
Internal Leak / Condensate Overflow Alarm
E20
Display shows E20; heater does not start and may indicate safety chain open.
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
Hewalex pool heater is running but makes loud banging, knocking, or metallic noises.
Mechanical Vibration / Internal Component Looseness
Symptom
Pool heater causes noticeable vibration transmitted to the ground or mounting surface.
Unit Vibration / Mounting Issue
Symptom
Pool heater does not start at all; display is blank and unit appears dead.
No Power / Control Circuit Dead
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
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 powers on but compressor never starts; fan may run continuously without heating.
Compressor Start Failure
Symptom
Unit produces a high‑pitched whine or electrical buzzing during operation.
Electrical Noise / Coil or Inverter Whine
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 |
Pool heat pump does not start; display shows E01 shortly after power-up.
|
High Pressure Protection (HP switch open) | View Details |
| E02 |
Pool heat pump stops heating and displays E02; unit may attempt to restart but trips again.
|
Low Pressure Protection (LP switch open) | View Details |
| E03 |
Hewalex pool heater powers on but compressor does not start; display shows E03.
|
Compressor Overload / Thermal Protection | View Details |
| E04 |
Unit stops and displays E04; fan may continue briefly then shut down.
|
Water Flow Protection / Flow Switch Open | View Details |
| E05 |
Display shows E05 and heating stops; unit may start and stop repeatedly.
|
Water Inlet Temperature Sensor Fault (NTC open/short) | View Details |
| E06 |
Display shows E06; unit will not start heating or stops shortly after start.
|
Water Outlet Temperature Sensor Fault (NTC open/short) | View Details |
| E07 |
Unit shows E07 and stops; fan may run but compressor does not.
|
Ambient Air Temperature Sensor Fault | View Details |
| E08 |
Display shows E08; unit may start but shuts down quickly.
|
Evaporator Coil Temperature Sensor Fault | View Details |
| E09 |
Hewalex pool heater shows E09 and will not run the compressor.
|
Defrost Sensor / Coil Frost Protection Fault | View Details |
| E10 |
Display shows E10; unit does not respond to commands or stops unexpectedly.
|
Communication Error Between Main PCB and Display/Remote Controller | View Details |
| E11 |
Unit shows E11 and will not start; sometimes occurs after a power surge.
|
EEPROM / Parameter Memory Error | View Details |
| E12 |
Display shows E12; unit may start but quickly stops with alarm.
|
Phase / Power Supply Error (for 3‑phase models) | View Details |
| E13 |
Hewalex pool heater shows E13 and shuts down; may be accompanied by unusual compressor noise.
|
Compressor Overcurrent / Inverter Protection (for inverter models) | View Details |
| E14 |
Display shows E14; fan does not start or stops abruptly.
|
Fan Motor Fault / Fan Feedback Error | View Details |
| E15 |
Unit displays E15 and stops; may occur during defrost or low ambient operation.
|
Defrost Failure / Defrost Timeout | View Details |
| E16 |
Display shows E16; 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; unit may run but with limited performance or stops intermittently.
|
Water Temperature Differential Too High / Flow Imbalance | View Details |
| E18 |
Display shows E18; unit may not respond to keypad inputs.
|
Keypad / User Interface Fault | View Details |
| E19 |
Unit shows E19 and stops; may be associated with internal water leak detection (if equipped).
|
Internal Leak / Condensate Overflow Alarm | View Details |
| E20 |
Display shows E20; heater does not start and may indicate safety chain open.
|
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 |
| – |
Hewalex pool heater is running but makes loud banging, knocking, or metallic noises.
|
Mechanical Vibration / Internal Component Looseness | View Details |
| – |
Pool heater causes noticeable vibration transmitted to the ground or mounting surface.
|
Unit Vibration / Mounting Issue | View Details |
| – |
Pool heater does not start at all; display is blank and unit appears dead.
|
No Power / Control Circuit Dead | 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 |
| – |
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 powers on but compressor never starts; fan may run continuously without heating.
|
Compressor Start Failure | View Details |
| – |
Unit produces a high‑pitched whine or electrical buzzing during operation.
|
Electrical Noise / Coil or Inverter Whine | 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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