Poolworld
Poolworld 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
Heater will not start; display shows E01 shortly after power-up
Flame Detection Failure / Ignition Lockout
E02
Heater attempts to start but shuts down with E02 on the display
Ignition Failure / No Flame Established
E03
Heater shuts down with E03; fan or blower may continue briefly then stop
Flue Gas Overheat / High Limit Tripped
E04
Heater displays E04 and will not fire; may occur immediately after start command
Water Flow Fault / Pressure Switch Open
E05
Heater shows E05 and shuts down; may occur after running for some time
Water Temperature Sensor (Thermistor) Fault
E06
Display shows E06; heater will not start or shuts down quickly
Outlet Temperature Sensor / Return Thermistor Fault
E07
Heater displays E07 and will not run; may occur after a power surge or lightning storm
Control Board Communication Error
E08
Heater shows E08; fan or inducer may not start
Air Pressure Switch / Combustion Air Fault
E09
Heater displays E09 and shuts down; may be accompanied by very hot outlet plumbing
Outlet Water Overheat / High Limit Exceeded
E10
Heater shows E10; unit may not respond to keypad commands
Keypad / User Interface Failure
E11
Heater displays E11; may occur when using external automation or remote control
External Control / Communication Fault
E12
Heater shows E12 and will not start; may occur after wiring changes
Line Voltage Polarity / Power Supply Error
E13
Heater displays E13; fan may run but burner does not light
Gas Valve Circuit Fault
E14
Heater shows E14; unit may start and stop repeatedly
Flame Sense Weak / Intermittent Flame Signal
E15
Heater displays E15; may occur in cold or damp weather
Condensate / Drain Fault (for condensing models)
E16
Heater shows E16; unit may shut down shortly after ignition
Inlet Temperature Sensor / Freeze Protection Fault
E17
Heater displays E17; may coincide with very high or very low displayed water temperature
Temperature Sensor Range / Calibration Error
E18
Heater shows E18; may occur when ambient air is very hot or vents are blocked
Ambient / Cabinet Overheat Fault
E19
Heater displays E19; may coincide with tripped breaker or blown internal fuse
Internal Overcurrent / Short Circuit Fault
E20
Heater shows E20; unit may lock out after several failed starts
Lockout Due to Repeated Ignition Failures
Symptom
Heater cabinet is excessively hot to the touch during operation
Cabinet Overheating / Poor Ventilation
Symptom
Heater causes noticeable drop in water flow or pressure when it runs
Excessive Hydraulic Restriction
Symptom
Heater display shows erratic or fluctuating water temperature readings
Unstable Temperature Sensing
Symptom
Heater display works but heater does not respond to temperature changes or mode selection
Unresponsive Controls / Keypad Failure
Symptom
Heater emits a strong gas smell around the unit, especially at startup
Gas Leak or Incomplete Ignition
Symptom
Heater frequently shuts off due to wind, especially with side winds
Wind-Induced Flame or Venting Issues
Symptom
Heater frequently shuts off on high limit when spa is in use with low water level
Localized Overheating in Spa Mode
Symptom
Heater is leaking water from the bottom of the cabinet
Internal Water Leak / Heat Exchanger or Plumbing Leak
Symptom
Heater is very noisy; loud fan, rattling, or vibration during operation
Mechanical Vibration / Fan or Blower Noise
Symptom
Heater makes loud banging or knocking noises during operation
Kettling / Boiling in Heat Exchanger
Symptom
Heater produces soot, black staining on cabinet, or dark exhaust
Sooting / Poor Combustion
Symptom
Heater runs but pool water does not reach set temperature or heats very slowly
Insufficient Heating Capacity / Flow or Sizing Issue
Symptom
Heater rusting prematurely around base or flue area
Corrosion / Environmental Damage
Symptom
Heater shuts off when pump speed is reduced on a variable-speed pump
Flow-Related Shutdown with Variable-Speed Pump
Symptom
Heater starts then shuts off after a few seconds; may cycle on and off repeatedly without error code
Short Cycling / Unstable Flame or Safety Interruption
Symptom
Heater trips the household GFCI or RCD when it starts
Ground Fault / Leakage Current
Symptom
Heater turns on even when there is no call for heat from the pool controller
Unintended Firing / Control Logic Fault
Symptom
Heater will not start at all; display is blank and no lights are on
No Power to Heater
| Error Code | Symptom | Fault Type | Guide |
|---|---|---|---|
| E01 |
Heater will not start; display shows E01 shortly after power-up
|
Flame Detection Failure / Ignition Lockout | View Details |
| E02 |
Heater attempts to start but shuts down with E02 on the display
|
Ignition Failure / No Flame Established | View Details |
| E03 |
Heater shuts down with E03; fan or blower may continue briefly then stop
|
Flue Gas Overheat / High Limit Tripped | View Details |
| E04 |
Heater displays E04 and will not fire; may occur immediately after start command
|
Water Flow Fault / Pressure Switch Open | View Details |
| E05 |
Heater shows E05 and shuts down; may occur after running for some time
|
Water Temperature Sensor (Thermistor) Fault | View Details |
| E06 |
Display shows E06; heater will not start or shuts down quickly
|
Outlet Temperature Sensor / Return Thermistor Fault | View Details |
| E07 |
Heater displays E07 and will not run; may occur after a power surge or lightning storm
|
Control Board Communication Error | View Details |
| E08 |
Heater shows E08; fan or inducer may not start
|
Air Pressure Switch / Combustion Air Fault | View Details |
| E09 |
Heater displays E09 and shuts down; may be accompanied by very hot outlet plumbing
|
Outlet Water Overheat / High Limit Exceeded | View Details |
| E10 |
Heater shows E10; unit may not respond to keypad commands
|
Keypad / User Interface Failure | View Details |
| E11 |
Heater displays E11; may occur when using external automation or remote control
|
External Control / Communication Fault | View Details |
| E12 |
Heater shows E12 and will not start; may occur after wiring changes
|
Line Voltage Polarity / Power Supply Error | View Details |
| E13 |
Heater displays E13; fan may run but burner does not light
|
Gas Valve Circuit Fault | View Details |
| E14 |
Heater shows E14; unit may start and stop repeatedly
|
Flame Sense Weak / Intermittent Flame Signal | View Details |
| E15 |
Heater displays E15; may occur in cold or damp weather
|
Condensate / Drain Fault (for condensing models) | View Details |
| E16 |
Heater shows E16; unit may shut down shortly after ignition
|
Inlet Temperature Sensor / Freeze Protection Fault | View Details |
| E17 |
Heater displays E17; may coincide with very high or very low displayed water temperature
|
Temperature Sensor Range / Calibration Error | View Details |
| E18 |
Heater shows E18; may occur when ambient air is very hot or vents are blocked
|
Ambient / Cabinet Overheat Fault | View Details |
| E19 |
Heater displays E19; may coincide with tripped breaker or blown internal fuse
|
Internal Overcurrent / Short Circuit Fault | View Details |
| E20 |
Heater shows E20; unit may lock out after several failed starts
|
Lockout Due to Repeated Ignition Failures | View Details |
| – |
Heater cabinet is excessively hot to the touch during operation
|
Cabinet Overheating / Poor Ventilation | View Details |
| – |
Heater causes noticeable drop in water flow or pressure when it runs
|
Excessive Hydraulic Restriction | View Details |
| – |
Heater display shows erratic or fluctuating water temperature readings
|
Unstable Temperature Sensing | View Details |
| – |
Heater display works but heater does not respond to temperature changes or mode selection
|
Unresponsive Controls / Keypad Failure | View Details |
| – |
Heater emits a strong gas smell around the unit, especially at startup
|
Gas Leak or Incomplete Ignition | View Details |
| – |
Heater frequently shuts off due to wind, especially with side winds
|
Wind-Induced Flame or Venting Issues | View Details |
| – |
Heater frequently shuts off on high limit when spa is in use with low water level
|
Localized Overheating in Spa Mode | View Details |
| – |
Heater is leaking water from the bottom of the cabinet
|
Internal Water Leak / Heat Exchanger or Plumbing Leak | View Details |
| – |
Heater is very noisy; loud fan, rattling, or vibration during operation
|
Mechanical Vibration / Fan or Blower Noise | View Details |
| – |
Heater makes loud banging or knocking noises during operation
|
Kettling / Boiling in Heat Exchanger | View Details |
| – |
Heater produces soot, black staining on cabinet, or dark exhaust
|
Sooting / Poor Combustion | View Details |
| – |
Heater runs but pool water does not reach set temperature or heats very slowly
|
Insufficient Heating Capacity / Flow or Sizing Issue | View Details |
| – |
Heater rusting prematurely around base or flue area
|
Corrosion / Environmental Damage | View Details |
| – |
Heater shuts off when pump speed is reduced on a variable-speed pump
|
Flow-Related Shutdown with Variable-Speed Pump | View Details |
| – |
Heater starts then shuts off after a few seconds; may cycle on and off repeatedly without error code
|
Short Cycling / Unstable Flame or Safety Interruption | View Details |
| – |
Heater trips the household GFCI or RCD when it starts
|
Ground Fault / Leakage Current | View Details |
| – |
Heater turns on even when there is no call for heat from the pool controller
|
Unintended Firing / Control Logic Fault | View Details |
| – |
Heater will not start at all; display is blank and no lights are on
|
No Power to Heater | View Details |
No matching codes found
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