Poolex
Poolex 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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E1
Poolex pool heater shows E1 and stops heating.
High Water Temperature Protection
E2
Poolex pool heater displays E2 and will not start heating.
Low Ambient Temperature Lockout
E3
Poolex pool heater shows E3 and stops; may occur during defrost cycles.
Defrost Protection / Defrost Sensor Error
E4
Poolex pool heater displays E4 and shuts down; may be accompanied by loud compressor noise.
Compressor Overheat / Thermal Protection
E5
Poolex pool heater shows E5 and will not start; often after a lightning storm or surge.
Main Control Board Fault / EEPROM Error
E6
Poolex pool heater displays E6 and stops; may occur when using external controls.
External Control / Remote Thermostat Error
E7
Poolex pool heater shows E7 and does not respond to keypad inputs.
Keypad / User Interface Fault
E8
Poolex pool heater intermittently shows E8 and stops; may be related to power quality.
Power Supply / Voltage Error
E9
Poolex pool heater shows E9 and will not start; may be accompanied by tripped breaker.
Earth Leakage / Ground Fault Detection
F1
Poolex pool heat pump will not start; display shows F1 shortly after power-up.
Low Refrigerant Pressure Protection
F2
Poolex pool heater stops heating and displays F2 on the control panel.
High Refrigerant Pressure Protection
F3
Poolex pool heat pump runs briefly then shuts down with F3 error on display.
Water Flow Protection / Low Water Flow
F4
Poolex pool heater shows F4 and will not start heating.
Water Inlet Temperature Sensor Fault
F5
Poolex pool heater displays F5 and stops heating; fan and compressor may not start.
Water Outlet Temperature Sensor Fault
F6
Poolex pool heater shows F6 and will not run; may occur immediately at startup.
Ambient Air Temperature Sensor Fault
F7
Poolex pool heater intermittently shuts down with F7 error; may occur during very cold or hot weather.
Evaporator Coil Temperature Sensor Fault / Anti-Freeze Sensor Error
F8
Poolex pool heater shows F8 and stops; fan may run but compressor does not.
Compressor Discharge Temperature Protection
F9
Poolex pool heater displays F9 and will not start; sometimes occurs after a storm or power surge.
Communication Fault Between Display Panel and Main Control Board
FA
Poolex pool heater shows FA and does not start the compressor.
Fan Motor Fault / Fan Feedback Error
Fb
Poolex pool heater displays Fb and stops; may occur during defrost or startup.
Four-Way Reversing Valve Fault / Defrost Valve Error
FC
Poolex pool heater shows FC and does not heat; may still power on.
Compressor Overload / Current Protection
Fd
Poolex pool heater displays Fd and will not start; often after incorrect wiring or power issues.
Phase Sequence / Phase Loss Error (Three-Phase Models)
Symptom
Poolex pool heater causes the house breaker or RCD to trip when starting.
High Inrush Current / Electrical Fault
Symptom
Poolex pool heater display is very dim or unreadable, but the unit still runs.
Display Backlight / LCD Failure
Symptom
Poolex pool heater display shows erratic or fluctuating water temperature readings.
Temperature Measurement Instability
Symptom
Poolex pool heater display works but buttons do not respond or respond intermittently.
Keypad Input Failure
Symptom
Poolex pool heater does not respond to external Wi-Fi or smart control app.
Communication / Wi-Fi Module Issue
Symptom
Poolex pool heater emits a burning smell during operation.
Overheating Electrical Component
Symptom
Poolex pool heater emits a high-pitched whine or electrical buzzing during operation.
Electrical Noise / Coil or Inverter Whine
Symptom
Poolex pool heater frequently cycles on and off in short intervals (short cycling).
Short Cycling / Control Instability
Symptom
Poolex pool heater frequently ices up on the evaporator coil and struggles to defrost.
Excessive Frost / Defrost Failure
Symptom
Poolex pool heater is running but makes loud rattling or vibrating noises.
Mechanical Vibration / Loose Components
Symptom
Poolex pool heater powers on but compressor never starts; only fan runs.
Compressor Start Failure
Symptom
Poolex pool heater runs but pool pump stops, causing the heater to shut down abruptly.
Hydraulic Interlock / Pump Control Issue
Symptom
Poolex pool heater runs but pool water does not reach set temperature or heats very slowly.
Insufficient Heating Capacity / Performance Loss
Symptom
Poolex pool heater will not start at all; display is blank and no lights are on.
No Power / Dead Unit
Symptom
Water leaking from the base of the Poolex pool heater during or after operation.
Water Leak / Condensate Misidentification
| Error Code | Symptom | Fault Type | Guide |
|---|---|---|---|
| E1 |
Poolex pool heater shows E1 and stops heating.
|
High Water Temperature Protection | View Details |
| E2 |
Poolex pool heater displays E2 and will not start heating.
|
Low Ambient Temperature Lockout | View Details |
| E3 |
Poolex pool heater shows E3 and stops; may occur during defrost cycles.
|
Defrost Protection / Defrost Sensor Error | View Details |
| E4 |
Poolex pool heater displays E4 and shuts down; may be accompanied by loud compressor noise.
|
Compressor Overheat / Thermal Protection | View Details |
| E5 |
Poolex pool heater shows E5 and will not start; often after a lightning storm or surge.
|
Main Control Board Fault / EEPROM Error | View Details |
| E6 |
Poolex pool heater displays E6 and stops; may occur when using external controls.
|
External Control / Remote Thermostat Error | View Details |
| E7 |
Poolex pool heater shows E7 and does not respond to keypad inputs.
|
Keypad / User Interface Fault | View Details |
| E8 |
Poolex pool heater intermittently shows E8 and stops; may be related to power quality.
|
Power Supply / Voltage Error | View Details |
| E9 |
Poolex pool heater shows E9 and will not start; may be accompanied by tripped breaker.
|
Earth Leakage / Ground Fault Detection | View Details |
| F1 |
Poolex pool heat pump will not start; display shows F1 shortly after power-up.
|
Low Refrigerant Pressure Protection | View Details |
| F2 |
Poolex pool heater stops heating and displays F2 on the control panel.
|
High Refrigerant Pressure Protection | View Details |
| F3 |
Poolex pool heat pump runs briefly then shuts down with F3 error on display.
|
Water Flow Protection / Low Water Flow | View Details |
| F4 |
Poolex pool heater shows F4 and will not start heating.
|
Water Inlet Temperature Sensor Fault | View Details |
| F5 |
Poolex pool heater displays F5 and stops heating; fan and compressor may not start.
|
Water Outlet Temperature Sensor Fault | View Details |
| F6 |
Poolex pool heater shows F6 and will not run; may occur immediately at startup.
|
Ambient Air Temperature Sensor Fault | View Details |
| F7 |
Poolex pool heater intermittently shuts down with F7 error; may occur during very cold or hot weather.
|
Evaporator Coil Temperature Sensor Fault / Anti-Freeze Sensor Error | View Details |
| F8 |
Poolex pool heater shows F8 and stops; fan may run but compressor does not.
|
Compressor Discharge Temperature Protection | View Details |
| F9 |
Poolex pool heater displays F9 and will not start; sometimes occurs after a storm or power surge.
|
Communication Fault Between Display Panel and Main Control Board | View Details |
| FA |
Poolex pool heater shows FA and does not start the compressor.
|
Fan Motor Fault / Fan Feedback Error | View Details |
| Fb |
Poolex pool heater displays Fb and stops; may occur during defrost or startup.
|
Four-Way Reversing Valve Fault / Defrost Valve Error | View Details |
| FC |
Poolex pool heater shows FC and does not heat; may still power on.
|
Compressor Overload / Current Protection | View Details |
| Fd |
Poolex pool heater displays Fd and will not start; often after incorrect wiring or power issues.
|
Phase Sequence / Phase Loss Error (Three-Phase Models) | View Details |
| – |
Poolex pool heater causes the house breaker or RCD to trip when starting.
|
High Inrush Current / Electrical Fault | View Details |
| – |
Poolex pool heater display is very dim or unreadable, but the unit still runs.
|
Display Backlight / LCD Failure | View Details |
| – |
Poolex pool heater display shows erratic or fluctuating water temperature readings.
|
Temperature Measurement Instability | View Details |
| – |
Poolex pool heater display works but buttons do not respond or respond intermittently.
|
Keypad Input Failure | View Details |
| – |
Poolex pool heater does not respond to external Wi-Fi or smart control app.
|
Communication / Wi-Fi Module Issue | View Details |
| – |
Poolex pool heater emits a burning smell during operation.
|
Overheating Electrical Component | View Details |
| – |
Poolex pool heater emits a high-pitched whine or electrical buzzing during operation.
|
Electrical Noise / Coil or Inverter Whine | View Details |
| – |
Poolex pool heater frequently cycles on and off in short intervals (short cycling).
|
Short Cycling / Control Instability | View Details |
| – |
Poolex pool heater frequently ices up on the evaporator coil and struggles to defrost.
|
Excessive Frost / Defrost Failure | View Details |
| – |
Poolex pool heater is running but makes loud rattling or vibrating noises.
|
Mechanical Vibration / Loose Components | View Details |
| – |
Poolex pool heater powers on but compressor never starts; only fan runs.
|
Compressor Start Failure | View Details |
| – |
Poolex pool heater runs but pool pump stops, causing the heater to shut down abruptly.
|
Hydraulic Interlock / Pump Control Issue | View Details |
| – |
Poolex pool heater runs but pool water does not reach set temperature or heats very slowly.
|
Insufficient Heating Capacity / Performance Loss | View Details |
| – |
Poolex pool heater will not start at all; display is blank and no lights are on.
|
No Power / Dead Unit | View Details |
| – |
Water leaking from the base of the Poolex pool heater during or after operation.
|
Water Leak / Condensate Misidentification | View Details |
No matching codes found
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