Zodiac
Zodiac 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
Zodiac gas pool heater will not ignite; display shows E01 shortly after a call for heat.
Ignition Failure / Ignition Lockout
E02
Zodiac pool heater starts ignition sequence but shuts down with E02; blower may run briefly then stop.
Flame Loss / Flame Proving Failure
E03
Zodiac pool heater displays E03 and will not fire; may occur immediately on a call for heat.
Pressure Switch / Water Flow Fault
E04
Zodiac pool heater shows E04 and shuts down; often occurs shortly after startup.
High Limit Switch Trip / Overheat Condition
E05
Zodiac pool heater displays E05; heater will not start or shuts down quickly.
Exhaust Temperature / Flue Sensor Fault
E06
Zodiac pool heater shows E06; heater does not respond properly to temperature settings.
Water Temperature Sensor (Thermistor) Fault
E07
Zodiac pool heater displays E07 and will not fire; may occur intermittently.
Air Flow / Blower Proving Fault
E08
Zodiac pool heater shows E08; control panel may be unresponsive or display erratic readings.
Control Board Communication / Internal Fault
E09
Zodiac pool heater displays E09; heater may start but shuts down or may not start at all.
Gas Valve / Gas Control Fault
E10
Zodiac pool heater shows E10; unit may not recognize external controls or may ignore local keypad commands.
External Control / Interface Fault
E11
Zodiac pool heater displays E11; ignition may start but then lock out.
Flame Sense Circuit Error
E12
Zodiac pool heater shows E12; may be accompanied by erratic temperature readings or unexpected shutdowns.
Outlet Water Temperature Sensor Fault
E13
Zodiac pool heater displays E13; heater may shut down during operation, especially in windy conditions.
Rollout Switch / Flame Rollout Fault
E14
Zodiac pool heater shows E14; unit may not respond to keypad inputs or may lock up.
Keypad / User Interface Fault
E15
Zodiac pool heater displays E15; heater may not start and may indicate a safety chain issue.
Safety Circuit Open (Limit String Open)
E16
Zodiac pool heater shows E16; may be associated with low-voltage or power issues.
Low Line Voltage / Power Supply Fault
E17
Zodiac pool heater displays E17; may occur when switching between pool and spa modes.
Mode / Sensor Mismatch Fault
E18
Zodiac pool heater shows E18; heater may shut down during operation with no obvious mechanical issue.
Internal Overcurrent / Board Protection Fault
E19
Zodiac pool heater displays E19; may coincide with erratic or no blower operation.
Blower Speed / Feedback Fault
E20
Zodiac pool heater shows E20; heater may not recognize water flow correctly even when pump is running.
Flow Sensor / Switch Fault (Heaters with Electronic Flow Sensing)
Symptom
Zodiac pool heater blower is very loud, squeals, or vibrates excessively during operation.
Blower Mechanical Wear / Imbalance
Symptom
Zodiac pool heater cabinet shows rust and corrosion, especially near the base and around water connections.
Cabinet Corrosion / Environmental Damage
Symptom
Zodiac pool heater causes the circuit breaker to trip when it starts.
Electrical Overload / Short Circuit
Symptom
Zodiac pool heater cycles on and off frequently without maintaining a stable temperature.
Short Cycling / Control Instability
Symptom
Zodiac pool heater display is on but does not respond to button presses.
Keypad Failure / Stuck Buttons
Symptom
Zodiac pool heater display shows very inaccurate water temperature compared to an external thermometer.
Temperature Sensing Error / Calibration Drift
Symptom
Zodiac pool heater emits a strong gas smell around the unit, especially at startup.
Gas Leak / Incomplete Combustion
Symptom
Zodiac pool heater ignites but then shuts off after a few seconds without an error code.
Flame Sensing Intermittent / Marginal Flame Signal
Symptom
Zodiac pool heater is installed on a saltwater pool and shows accelerated corrosion and internal scaling.
Saltwater Corrosion / Scale Accumulation
Symptom
Zodiac pool heater leaks water from the bottom of the cabinet.
Internal Water Leak / Heat Exchanger or Manifold Leak
Symptom
Zodiac pool heater makes loud banging or popping noises during operation.
Delayed Ignition / Combustion Instability
Symptom
Zodiac pool heater repeatedly locks out and must be manually reset to restart.
Repeated Ignition Lockout / Safety Lockout
Symptom
Zodiac pool heater runs but causes excessive condensation or steam at the exhaust.
Condensation / Low Return Water Temperature
Symptom
Zodiac pool heater runs but water does not reach set temperature or heats very slowly.
Insufficient Heating Capacity / Underfiring
Symptom
Zodiac pool heater shuts down when it rains or in very humid conditions.
Moisture Intrusion / Condensation Fault
Symptom
Zodiac pool heater shuts off when the pump speed is reduced on a variable-speed pump.
Flow-Dependent Shutdown / Pressure Switch Sensitivity
Symptom
Zodiac pool heater will not start at all; display is blank or does not light.
No Power / Dead Control
| Error Code | Symptom | Fault Type | Guide |
|---|---|---|---|
| E01 |
Zodiac gas pool heater will not ignite; display shows E01 shortly after a call for heat.
|
Ignition Failure / Ignition Lockout | View Details |
| E02 |
Zodiac pool heater starts ignition sequence but shuts down with E02; blower may run briefly then stop.
|
Flame Loss / Flame Proving Failure | View Details |
| E03 |
Zodiac pool heater displays E03 and will not fire; may occur immediately on a call for heat.
|
Pressure Switch / Water Flow Fault | View Details |
| E04 |
Zodiac pool heater shows E04 and shuts down; often occurs shortly after startup.
|
High Limit Switch Trip / Overheat Condition | View Details |
| E05 |
Zodiac pool heater displays E05; heater will not start or shuts down quickly.
|
Exhaust Temperature / Flue Sensor Fault | View Details |
| E06 |
Zodiac pool heater shows E06; heater does not respond properly to temperature settings.
|
Water Temperature Sensor (Thermistor) Fault | View Details |
| E07 |
Zodiac pool heater displays E07 and will not fire; may occur intermittently.
|
Air Flow / Blower Proving Fault | View Details |
| E08 |
Zodiac pool heater shows E08; control panel may be unresponsive or display erratic readings.
|
Control Board Communication / Internal Fault | View Details |
| E09 |
Zodiac pool heater displays E09; heater may start but shuts down or may not start at all.
|
Gas Valve / Gas Control Fault | View Details |
| E10 |
Zodiac pool heater shows E10; unit may not recognize external controls or may ignore local keypad commands.
|
External Control / Interface Fault | View Details |
| E11 |
Zodiac pool heater displays E11; ignition may start but then lock out.
|
Flame Sense Circuit Error | View Details |
| E12 |
Zodiac pool heater shows E12; may be accompanied by erratic temperature readings or unexpected shutdowns.
|
Outlet Water Temperature Sensor Fault | View Details |
| E13 |
Zodiac pool heater displays E13; heater may shut down during operation, especially in windy conditions.
|
Rollout Switch / Flame Rollout Fault | View Details |
| E14 |
Zodiac pool heater shows E14; unit may not respond to keypad inputs or may lock up.
|
Keypad / User Interface Fault | View Details |
| E15 |
Zodiac pool heater displays E15; heater may not start and may indicate a safety chain issue.
|
Safety Circuit Open (Limit String Open) | View Details |
| E16 |
Zodiac pool heater shows E16; may be associated with low-voltage or power issues.
|
Low Line Voltage / Power Supply Fault | View Details |
| E17 |
Zodiac pool heater displays E17; may occur when switching between pool and spa modes.
|
Mode / Sensor Mismatch Fault | View Details |
| E18 |
Zodiac pool heater shows E18; heater may shut down during operation with no obvious mechanical issue.
|
Internal Overcurrent / Board Protection Fault | View Details |
| E19 |
Zodiac pool heater displays E19; may coincide with erratic or no blower operation.
|
Blower Speed / Feedback Fault | View Details |
| E20 |
Zodiac pool heater shows E20; heater may not recognize water flow correctly even when pump is running.
|
Flow Sensor / Switch Fault (Heaters with Electronic Flow Sensing) | View Details |
| – |
Zodiac pool heater blower is very loud, squeals, or vibrates excessively during operation.
|
Blower Mechanical Wear / Imbalance | View Details |
| – |
Zodiac pool heater cabinet shows rust and corrosion, especially near the base and around water connections.
|
Cabinet Corrosion / Environmental Damage | View Details |
| – |
Zodiac pool heater causes the circuit breaker to trip when it starts.
|
Electrical Overload / Short Circuit | View Details |
| – |
Zodiac pool heater cycles on and off frequently without maintaining a stable temperature.
|
Short Cycling / Control Instability | View Details |
| – |
Zodiac pool heater display is on but does not respond to button presses.
|
Keypad Failure / Stuck Buttons | View Details |
| – |
Zodiac pool heater display shows very inaccurate water temperature compared to an external thermometer.
|
Temperature Sensing Error / Calibration Drift | View Details |
| – |
Zodiac pool heater emits a strong gas smell around the unit, especially at startup.
|
Gas Leak / Incomplete Combustion | View Details |
| – |
Zodiac pool heater ignites but then shuts off after a few seconds without an error code.
|
Flame Sensing Intermittent / Marginal Flame Signal | View Details |
| – |
Zodiac pool heater is installed on a saltwater pool and shows accelerated corrosion and internal scaling.
|
Saltwater Corrosion / Scale Accumulation | View Details |
| – |
Zodiac pool heater leaks water from the bottom of the cabinet.
|
Internal Water Leak / Heat Exchanger or Manifold Leak | View Details |
| – |
Zodiac pool heater makes loud banging or popping noises during operation.
|
Delayed Ignition / Combustion Instability | View Details |
| – |
Zodiac pool heater repeatedly locks out and must be manually reset to restart.
|
Repeated Ignition Lockout / Safety Lockout | View Details |
| – |
Zodiac pool heater runs but causes excessive condensation or steam at the exhaust.
|
Condensation / Low Return Water Temperature | View Details |
| – |
Zodiac pool heater runs but water does not reach set temperature or heats very slowly.
|
Insufficient Heating Capacity / Underfiring | View Details |
| – |
Zodiac pool heater shuts down when it rains or in very humid conditions.
|
Moisture Intrusion / Condensation Fault | View Details |
| – |
Zodiac pool heater shuts off when the pump speed is reduced on a variable-speed pump.
|
Flow-Dependent Shutdown / Pressure Switch Sensitivity | View Details |
| – |
Zodiac pool heater will not start at all; display is blank or does not light.
|
No Power / Dead Control | View Details |
No matching codes found
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