Pentair
Pentair 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 fire, display shows E01 shortly after a call for heat.
Ignition Failure Lockout
E02
Heater attempts to start but shuts down with E02 on the display.
Flame Sense Failure
E03
Heater shuts down with E03, often shortly after ignition or during operation.
Pressure Switch / Water Flow Fault
E04
Heater displays E04 and will not fire or shuts down quickly after starting.
High Limit Switch Open (Overheat Condition)
E05
Heater shows E05 and will not start a heating cycle.
Rollout Switch / Flame Rollout Fault
E06
Heater displays E06 and will not fire; may occur immediately at startup.
Air Flow / Blower Fault
E07
Heater shows E07 and shuts down or will not start.
Stack Flue Sensor Fault / Flue Overheat
E08
Heater displays E08 and will not operate.
Outlet Water Temperature Sensor Fault
E09
Heater shows E09 and will not start or shuts down.
Inlet Water Temperature Sensor Fault
E10
Heater displays E10 and refuses to start a heating cycle.
Water Temperature Differential Fault
E11
Heater shows E11 and will not fire.
Gas Valve Circuit Fault
E12
Heater displays E12 and shuts down or will not start.
Low Voltage / Power Supply Fault
E13
Heater shows E13 and will not respond to thermostat commands.
Communication Fault (External Controller / RS-485)
E14
Heater displays E14 and will not fire when there is a call for heat.
Thermostat / Temperature Setpoint Fault
E15
Heater shows E15 and shuts down during operation.
Internal Bypass / Thermal Regulator Fault
E16
Heater displays E16 and will not start; may be associated with freeze protection or sensor issues.
Ambient / Freeze Sensor Fault
E20
Heater shows E20 and will not fire when controlled by an external system.
Remote Thermostat Input Fault
E21
Heater displays E21 and shuts down, often during windy conditions.
Flame Stability / Wind Fault
E22
Heater shows E22 and will not start; may occur after a surge or lightning event.
Internal Control Board Fault
E25
Heater displays E25 and shuts down during operation.
Outlet Temperature Over-Limit
E26
Heater shows E26 and will not fire.
Blower Proving / Air Pressure Switch Stuck
E27
Heater displays E27 and shuts down, often intermittently.
Intermittent Flame Sense / Flame Dropout
E28
Heater shows E28 and will not start; may be associated with internal safety string.
Safety Circuit Open (Limit String Fault)
E29
Heater displays E29 and will not respond to commands from automation.
Addressing / Configuration Fault with Automation
Symptom
Heater cabinet shows rust streaks and corrosion, especially near the base and around water connections.
Corrosion Damage
Symptom
Heater causes the circuit breaker to trip immediately or shortly after startup.
Electrical Short / Overcurrent
Symptom
Heater cycles on and off frequently without reaching the set temperature.
Short Cycling
Symptom
Heater display is on but unit does not respond to button presses or temperature changes.
Unresponsive Keypad / User Interface Failure
Symptom
Heater display shows erratic or rapidly changing water temperature readings.
Erratic Temperature Sensing
Symptom
Heater emits a loud whistling or howling noise from the exhaust or burner area.
Combustion Resonance / Airflow Noise
Symptom
Heater emits a strong gas smell around the unit, especially near the gas valve or piping.
Gas Leak at Heater
Symptom
Heater fan or blower continues to run for a long time after the burner shuts off.
Extended Post-Purge / Blower Run-On
Symptom
Heater makes loud banging or knocking noises during operation.
Kettling / Boiling in Heat Exchanger
Symptom
Heater produces soot around the exhaust outlet or dark stains on nearby surfaces.
Sooting / Incomplete Combustion
Symptom
Heater runs but water does not get warm or takes an extremely long time to heat.
Insufficient Heating / Underheating
Symptom
Heater shuts down when it rains or after heavy condensation, then works again when dry.
Moisture Intrusion / Condensation Fault
Symptom
Heater shuts off when the pump speed is reduced on a variable-speed pump.
Flow-Dependent Shutdown
Symptom
Heater turns on even when there is no apparent call for heat from the pool or spa.
Unintended Firing / False Call for Heat
Symptom
Heater will not start at all; display is blank and no lights or sounds are present.
No Power to Heater
Symptom
Water is leaking from the bottom of the heater cabinet.
Internal Water Leak
| Error Code | Symptom | Fault Type | Guide |
|---|---|---|---|
| E01 |
Heater will not fire, display shows E01 shortly after a call for heat.
|
Ignition Failure Lockout | View Details |
| E02 |
Heater attempts to start but shuts down with E02 on the display.
|
Flame Sense Failure | View Details |
| E03 |
Heater shuts down with E03, often shortly after ignition or during operation.
|
Pressure Switch / Water Flow Fault | View Details |
| E04 |
Heater displays E04 and will not fire or shuts down quickly after starting.
|
High Limit Switch Open (Overheat Condition) | View Details |
| E05 |
Heater shows E05 and will not start a heating cycle.
|
Rollout Switch / Flame Rollout Fault | View Details |
| E06 |
Heater displays E06 and will not fire; may occur immediately at startup.
|
Air Flow / Blower Fault | View Details |
| E07 |
Heater shows E07 and shuts down or will not start.
|
Stack Flue Sensor Fault / Flue Overheat | View Details |
| E08 |
Heater displays E08 and will not operate.
|
Outlet Water Temperature Sensor Fault | View Details |
| E09 |
Heater shows E09 and will not start or shuts down.
|
Inlet Water Temperature Sensor Fault | View Details |
| E10 |
Heater displays E10 and refuses to start a heating cycle.
|
Water Temperature Differential Fault | View Details |
| E11 |
Heater shows E11 and will not fire.
|
Gas Valve Circuit Fault | View Details |
| E12 |
Heater displays E12 and shuts down or will not start.
|
Low Voltage / Power Supply Fault | View Details |
| E13 |
Heater shows E13 and will not respond to thermostat commands.
|
Communication Fault (External Controller / RS-485) | View Details |
| E14 |
Heater displays E14 and will not fire when there is a call for heat.
|
Thermostat / Temperature Setpoint Fault | View Details |
| E15 |
Heater shows E15 and shuts down during operation.
|
Internal Bypass / Thermal Regulator Fault | View Details |
| E16 |
Heater displays E16 and will not start; may be associated with freeze protection or sensor issues.
|
Ambient / Freeze Sensor Fault | View Details |
| E20 |
Heater shows E20 and will not fire when controlled by an external system.
|
Remote Thermostat Input Fault | View Details |
| E21 |
Heater displays E21 and shuts down, often during windy conditions.
|
Flame Stability / Wind Fault | View Details |
| E22 |
Heater shows E22 and will not start; may occur after a surge or lightning event.
|
Internal Control Board Fault | View Details |
| E25 |
Heater displays E25 and shuts down during operation.
|
Outlet Temperature Over-Limit | View Details |
| E26 |
Heater shows E26 and will not fire.
|
Blower Proving / Air Pressure Switch Stuck | View Details |
| E27 |
Heater displays E27 and shuts down, often intermittently.
|
Intermittent Flame Sense / Flame Dropout | View Details |
| E28 |
Heater shows E28 and will not start; may be associated with internal safety string.
|
Safety Circuit Open (Limit String Fault) | View Details |
| E29 |
Heater displays E29 and will not respond to commands from automation.
|
Addressing / Configuration Fault with Automation | View Details |
| – |
Heater cabinet shows rust streaks and corrosion, especially near the base and around water connections.
|
Corrosion Damage | View Details |
| – |
Heater causes the circuit breaker to trip immediately or shortly after startup.
|
Electrical Short / Overcurrent | View Details |
| – |
Heater cycles on and off frequently without reaching the set temperature.
|
Short Cycling | View Details |
| – |
Heater display is on but unit does not respond to button presses or temperature changes.
|
Unresponsive Keypad / User Interface Failure | View Details |
| – |
Heater display shows erratic or rapidly changing water temperature readings.
|
Erratic Temperature Sensing | View Details |
| – |
Heater emits a loud whistling or howling noise from the exhaust or burner area.
|
Combustion Resonance / Airflow Noise | View Details |
| – |
Heater emits a strong gas smell around the unit, especially near the gas valve or piping.
|
Gas Leak at Heater | View Details |
| – |
Heater fan or blower continues to run for a long time after the burner shuts off.
|
Extended Post-Purge / Blower Run-On | View Details |
| – |
Heater makes loud banging or knocking noises during operation.
|
Kettling / Boiling in Heat Exchanger | View Details |
| – |
Heater produces soot around the exhaust outlet or dark stains on nearby surfaces.
|
Sooting / Incomplete Combustion | View Details |
| – |
Heater runs but water does not get warm or takes an extremely long time to heat.
|
Insufficient Heating / Underheating | View Details |
| – |
Heater shuts down when it rains or after heavy condensation, then works again when dry.
|
Moisture Intrusion / Condensation Fault | View Details |
| – |
Heater shuts off when the pump speed is reduced on a variable-speed pump.
|
Flow-Dependent Shutdown | View Details |
| – |
Heater turns on even when there is no apparent call for heat from the pool or spa.
|
Unintended Firing / False Call for Heat | View Details |
| – |
Heater will not start at all; display is blank and no lights or sounds are present.
|
No Power to Heater | View Details |
| – |
Water is leaking from the bottom of the heater cabinet.
|
Internal Water Leak | View Details |
No matching codes found
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