SunHeater
SunHeater 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 ignite; display shows E01 shortly after a call for heat
Ignition Failure Lockout
E02
Heater attempts to start but shuts down with E02; blower may run briefly then stop
Flame Loss / Flame Proving Failure
E03
Heater displays E03 and will not start; blower may not run
Pressure Switch / Water Flow Fault
E04
Heater shuts down with E04 after running briefly; display may show rising temperature quickly
High Limit Temperature Switch Open
E05
Heater displays E05 and will not fire; blower may start then stop
Exhaust / Flue Temperature Fault
E06
Heater shows E06 and does not respond to heat commands
Inlet Water Temperature Sensor Fault
E07
Heater displays E07 and will not heat; may occur intermittently as water warms
Outlet Water Temperature Sensor Fault
E08
Heater shows E08; blower may not start or may start then immediately stop
Air Pressure Switch / Inducer Proving Fault
E09
Heater displays E09 and locks out; no ignition attempt is heard
Gas Valve Circuit Fault
E10
Heater shows E10; keypad or external controller does not respond properly
Communication Error with User Interface / External Controller
E11
Heater displays E11 and shuts down; may occur during windy conditions
Flame Rollout / Rollout Switch Open
E12
Heater shows E12 and will not start; internal fan may run continuously
Overheat / Internal Cabinet Temperature Fault
E13
Heater displays E13; ignition sequence may not start
Low Line Voltage / Power Supply Fault
E14
Heater shows E14 and locks out; may occur after multiple failed ignition attempts
Ignition Lockout (Exceeded Retry Limit)
E15
Heater displays E15; temperature reading on display is obviously wrong (very high or very low)
Temperature Sensor Calibration / Range Error
E16
Heater shows E16 and will not start; may be accompanied by internal clicking
Relay / Output Driver Fault
E17
Heater displays E17; occurs when using remote/automation control
External Thermostat / Remote Input Fault
E18
Heater shows E18; fan/blower speed seems abnormal or noisy
Combustion Blower Speed / Tachometer Fault
E19
Heater displays E19; occurs when switching between pool and spa modes
Mode Valve / Sensor Configuration Error
E20
Heater shows E20 and shuts down; may be associated with condensate around base of unit
Condensate Drain / Float Switch Fault (Condensing Models)
Symptom
Heater cabinet shows rust and corrosion, especially near the base and flue
Corrosion from Condensate or Environmental Exposure
Symptom
Heater cycles on and off frequently without maintaining a steady run
Short Cycling
Symptom
Heater display flickers or resets when the blower or pump starts
Electrical Interference / Voltage Drop
Symptom
Heater display is on but unit does not respond to button presses
Keypad / User Interface Failure
Symptom
Heater emits a strong burning or plastic smell when first starting or after repair
Overheating of Wiring or Debris on Heat Exchanger
Symptom
Heater emits a strong gas smell around the unit, especially before or after operation
Gas Leak or Incomplete Combustion
Symptom
Heater fan/blower continues to run for a very long time after burner shuts off
Post-Purge Overrun / Stuck Relay
Symptom
Heater frequently trips the high limit but water flow appears normal
Localized Overheating / Scale Buildup
Symptom
Heater is running but there is water leaking from the bottom of the cabinet
Internal Water Leak / Heat Exchanger or Header Leak
Symptom
Heater leaks only when pump is off; water drips slowly from plumbing connections
Static Plumbing Leak at Heater Connections
Symptom
Heater makes loud banging or popping noises during operation
Delayed Ignition / Combustion Instability
Symptom
Heater operates but external pool automation cannot turn it on or off
Control Integration / Interface Failure
Symptom
Heater produces a whistling or high-pitched noise during operation
Airflow or Gas Flow Resonance
Symptom
Heater runs but pool does not reach set temperature or heats very slowly
Insufficient Heating Capacity / Flow or Sizing Issue
Symptom
Heater runs but spa overheats beyond the set temperature
Runaway Heating / Thermostat Control Failure
Symptom
Heater shuts off when pump speed is reduced on a variable-speed pump
Flow-Dependent Shutdown
Symptom
Heater vibrates excessively or rattles when the blower is running
Mechanical Vibration / Loose Mounting
Symptom
Heater will not fire when using spa mode, but works in pool mode
Spa Mode Control / Sensor 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 ignite; display shows E01 shortly after a call for heat
|
Ignition Failure Lockout | View Details |
| E02 |
Heater attempts to start but shuts down with E02; blower may run briefly then stop
|
Flame Loss / Flame Proving Failure | View Details |
| E03 |
Heater displays E03 and will not start; blower may not run
|
Pressure Switch / Water Flow Fault | View Details |
| E04 |
Heater shuts down with E04 after running briefly; display may show rising temperature quickly
|
High Limit Temperature Switch Open | View Details |
| E05 |
Heater displays E05 and will not fire; blower may start then stop
|
Exhaust / Flue Temperature Fault | View Details |
| E06 |
Heater shows E06 and does not respond to heat commands
|
Inlet Water Temperature Sensor Fault | View Details |
| E07 |
Heater displays E07 and will not heat; may occur intermittently as water warms
|
Outlet Water Temperature Sensor Fault | View Details |
| E08 |
Heater shows E08; blower may not start or may start then immediately stop
|
Air Pressure Switch / Inducer Proving Fault | View Details |
| E09 |
Heater displays E09 and locks out; no ignition attempt is heard
|
Gas Valve Circuit Fault | View Details |
| E10 |
Heater shows E10; keypad or external controller does not respond properly
|
Communication Error with User Interface / External Controller | View Details |
| E11 |
Heater displays E11 and shuts down; may occur during windy conditions
|
Flame Rollout / Rollout Switch Open | View Details |
| E12 |
Heater shows E12 and will not start; internal fan may run continuously
|
Overheat / Internal Cabinet Temperature Fault | View Details |
| E13 |
Heater displays E13; ignition sequence may not start
|
Low Line Voltage / Power Supply Fault | View Details |
| E14 |
Heater shows E14 and locks out; may occur after multiple failed ignition attempts
|
Ignition Lockout (Exceeded Retry Limit) | View Details |
| E15 |
Heater displays E15; temperature reading on display is obviously wrong (very high or very low)
|
Temperature Sensor Calibration / Range Error | View Details |
| E16 |
Heater shows E16 and will not start; may be accompanied by internal clicking
|
Relay / Output Driver Fault | View Details |
| E17 |
Heater displays E17; occurs when using remote/automation control
|
External Thermostat / Remote Input Fault | View Details |
| E18 |
Heater shows E18; fan/blower speed seems abnormal or noisy
|
Combustion Blower Speed / Tachometer Fault | View Details |
| E19 |
Heater displays E19; occurs when switching between pool and spa modes
|
Mode Valve / Sensor Configuration Error | View Details |
| E20 |
Heater shows E20 and shuts down; may be associated with condensate around base of unit
|
Condensate Drain / Float Switch Fault (Condensing Models) | View Details |
| – |
Heater cabinet shows rust and corrosion, especially near the base and flue
|
Corrosion from Condensate or Environmental Exposure | View Details |
| – |
Heater cycles on and off frequently without maintaining a steady run
|
Short Cycling | View Details |
| – |
Heater display flickers or resets when the blower or pump starts
|
Electrical Interference / Voltage Drop | View Details |
| – |
Heater display is on but unit does not respond to button presses
|
Keypad / User Interface Failure | View Details |
| – |
Heater emits a strong burning or plastic smell when first starting or after repair
|
Overheating of Wiring or Debris on Heat Exchanger | View Details |
| – |
Heater emits a strong gas smell around the unit, especially before or after operation
|
Gas Leak or Incomplete Combustion | View Details |
| – |
Heater fan/blower continues to run for a very long time after burner shuts off
|
Post-Purge Overrun / Stuck Relay | View Details |
| – |
Heater frequently trips the high limit but water flow appears normal
|
Localized Overheating / Scale Buildup | View Details |
| – |
Heater is running but there is water leaking from the bottom of the cabinet
|
Internal Water Leak / Heat Exchanger or Header Leak | View Details |
| – |
Heater leaks only when pump is off; water drips slowly from plumbing connections
|
Static Plumbing Leak at Heater Connections | View Details |
| – |
Heater makes loud banging or popping noises during operation
|
Delayed Ignition / Combustion Instability | View Details |
| – |
Heater operates but external pool automation cannot turn it on or off
|
Control Integration / Interface Failure | View Details |
| – |
Heater produces a whistling or high-pitched noise during operation
|
Airflow or Gas Flow Resonance | View Details |
| – |
Heater runs but pool does not reach set temperature or heats very slowly
|
Insufficient Heating Capacity / Flow or Sizing Issue | View Details |
| – |
Heater runs but spa overheats beyond the set temperature
|
Runaway Heating / Thermostat Control Failure | View Details |
| – |
Heater shuts off when pump speed is reduced on a variable-speed pump
|
Flow-Dependent Shutdown | View Details |
| – |
Heater vibrates excessively or rattles when the blower is running
|
Mechanical Vibration / Loose Mounting | View Details |
| – |
Heater will not fire when using spa mode, but works in pool mode
|
Spa Mode Control / Sensor 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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