Elecro
Elecro 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.
Flow Switch Open / Insufficient Water Flow
E02
Heater stops heating and displays E02; unit may attempt to restart but trips again.
High Limit Overheat Trip
E03
Display shows E03 and heater will not energize elements.
Water Temperature Sensor (NTC) Fault
E04
Heater display shows E04 and heating is disabled.
Output Relay / Contactor Fault
E05
Display shows E05; heater does not respond to thermostat changes.
Control PCB Communication / Internal Fault
E06
Heater shows E06 and will not heat; may occur after a power surge or storm.
Supply Voltage Out of Range / Phase Error
E07
Display shows E07; heater may start then immediately stop.
Earth Leakage / Ground Fault Detected
E08
Heater shows E08 and does not heat; fan (on air-source models) or pump runs but no temperature rise.
Current Imbalance / Element Bank Fault
E09
Display shows E09; heater may operate erratically or ignore set temperature.
Thermostat / Keypad Interface Error
E10
Heater displays E10 and will not start; often after installation or plumbing changes.
Incorrect Flow Direction / Flow Sensor Orientation Error
E11
Display shows E11; heater may run but not reach set temperature or may shut down prematurely.
Calibration / Temperature Offset Error
E12
Heater shows E12 and locks out; may be associated with very cold ambient conditions.
Frost Protection / Low Temperature Lockout
E13
Display shows E13; heater may trip breakers or fail to start.
Internal Overcurrent / Short Circuit Protection
E14
Heater shows E14; unit may run pump/fan but refuses to energize elements.
Safety Chain Open (Interlock Fault)
E15
Display shows E15; heater cycles on and off rapidly or fails to maintain temperature.
Sensor Discrepancy / Dual Sensor Mismatch
E16
Heater shows E16; unit may be locked out after multiple failed start attempts.
Lockout After Repeated Faults
Symptom
Heater appears to run normally but energy consumption is unusually high.
Inefficient Operation / Heat Loss
Symptom
Heater causes noticeable vibration in the connected pipework when running.
Hydraulic Vibration / Resonance
Symptom
Heater controls are unresponsive; buttons do not change settings or start/stop heating.
Keypad / Control Interface Failure
Symptom
Heater corrodes prematurely or shows rusting on external metal parts.
Corrosion / Environmental Damage
Symptom
Heater cycles on and off rapidly, causing temperature to fluctuate and contactor to chatter.
Short Cycling / Unstable Control
Symptom
Heater display is dim, flickering, or unreadable, but unit may still heat.
Display / LCD Failure
Symptom
Heater display is on but elements never energize; no heat is produced.
No Heat Output with Active Control
Symptom
Heater does not power on at all; display is blank and no indicators are lit.
No Power / Dead Unit
Symptom
Heater elements show heavy white or brown scale deposits when inspected.
Limescale Build-Up on Heating Elements
Symptom
Heater emits a humming or buzzing noise from inside the cabinet during operation.
Electrical Hum from Contactor or Transformer
Symptom
Heater frequently shows small drips from the pressure relief or drain points when hot.
Thermal Expansion Dripping / Minor Weeping
Symptom
Heater is leaking water from the base or around pipe connections.
Water Leak from Heater Body or Manifold
Symptom
Heater makes loud banging or knocking noises when heating.
Water Hammer / Boiling in Heat Exchanger
Symptom
Heater occasionally shuts down during heavy rain or after splashing, then recovers when dry.
Moisture Ingress into Electrical Compartment
Symptom
Heater repeatedly shuts down with no error code when the pump stops.
Pump Interlock / Flow-Dependent Shutdown
Symptom
Heater runs but pool water does not reach the set temperature or heats very slowly.
Insufficient Heating Capacity / Underperformance
Symptom
Heater trips the breaker or RCD immediately when turned on.
Short Circuit or Earth Leakage on Startup
Symptom
Heater’s flow switch rattles or chatters audibly during operation.
Unstable Flow at Flow Switch
Symptom
Heater’s internal components show signs of melting or discoloration around terminals.
Overheating of Electrical Connections
Symptom
Heater’s temperature reading drifts slowly over time, becoming inaccurate by several degrees.
Sensor Drift / Aging NTC
| Error Code | Symptom | Fault Type | Guide |
|---|---|---|---|
| E01 |
Heater will not start; display shows E01 shortly after power-up.
|
Flow Switch Open / Insufficient Water Flow | View Details |
| E02 |
Heater stops heating and displays E02; unit may attempt to restart but trips again.
|
High Limit Overheat Trip | View Details |
| E03 |
Display shows E03 and heater will not energize elements.
|
Water Temperature Sensor (NTC) Fault | View Details |
| E04 |
Heater display shows E04 and heating is disabled.
|
Output Relay / Contactor Fault | View Details |
| E05 |
Display shows E05; heater does not respond to thermostat changes.
|
Control PCB Communication / Internal Fault | View Details |
| E06 |
Heater shows E06 and will not heat; may occur after a power surge or storm.
|
Supply Voltage Out of Range / Phase Error | View Details |
| E07 |
Display shows E07; heater may start then immediately stop.
|
Earth Leakage / Ground Fault Detected | View Details |
| E08 |
Heater shows E08 and does not heat; fan (on air-source models) or pump runs but no temperature rise.
|
Current Imbalance / Element Bank Fault | View Details |
| E09 |
Display shows E09; heater may operate erratically or ignore set temperature.
|
Thermostat / Keypad Interface Error | View Details |
| E10 |
Heater displays E10 and will not start; often after installation or plumbing changes.
|
Incorrect Flow Direction / Flow Sensor Orientation Error | View Details |
| E11 |
Display shows E11; heater may run but not reach set temperature or may shut down prematurely.
|
Calibration / Temperature Offset Error | View Details |
| E12 |
Heater shows E12 and locks out; may be associated with very cold ambient conditions.
|
Frost Protection / Low Temperature Lockout | View Details |
| E13 |
Display shows E13; heater may trip breakers or fail to start.
|
Internal Overcurrent / Short Circuit Protection | View Details |
| E14 |
Heater shows E14; unit may run pump/fan but refuses to energize elements.
|
Safety Chain Open (Interlock Fault) | View Details |
| E15 |
Display shows E15; heater cycles on and off rapidly or fails to maintain temperature.
|
Sensor Discrepancy / Dual Sensor Mismatch | View Details |
| E16 |
Heater shows E16; unit may be locked out after multiple failed start attempts.
|
Lockout After Repeated Faults | View Details |
| – |
Heater appears to run normally but energy consumption is unusually high.
|
Inefficient Operation / Heat Loss | View Details |
| – |
Heater causes noticeable vibration in the connected pipework when running.
|
Hydraulic Vibration / Resonance | View Details |
| – |
Heater controls are unresponsive; buttons do not change settings or start/stop heating.
|
Keypad / Control Interface Failure | View Details |
| – |
Heater corrodes prematurely or shows rusting on external metal parts.
|
Corrosion / Environmental Damage | View Details |
| – |
Heater cycles on and off rapidly, causing temperature to fluctuate and contactor to chatter.
|
Short Cycling / Unstable Control | View Details |
| – |
Heater display is dim, flickering, or unreadable, but unit may still heat.
|
Display / LCD Failure | View Details |
| – |
Heater display is on but elements never energize; no heat is produced.
|
No Heat Output with Active Control | View Details |
| – |
Heater does not power on at all; display is blank and no indicators are lit.
|
No Power / Dead Unit | View Details |
| – |
Heater elements show heavy white or brown scale deposits when inspected.
|
Limescale Build-Up on Heating Elements | View Details |
| – |
Heater emits a humming or buzzing noise from inside the cabinet during operation.
|
Electrical Hum from Contactor or Transformer | View Details |
| – |
Heater frequently shows small drips from the pressure relief or drain points when hot.
|
Thermal Expansion Dripping / Minor Weeping | View Details |
| – |
Heater is leaking water from the base or around pipe connections.
|
Water Leak from Heater Body or Manifold | View Details |
| – |
Heater makes loud banging or knocking noises when heating.
|
Water Hammer / Boiling in Heat Exchanger | View Details |
| – |
Heater occasionally shuts down during heavy rain or after splashing, then recovers when dry.
|
Moisture Ingress into Electrical Compartment | View Details |
| – |
Heater repeatedly shuts down with no error code when the pump stops.
|
Pump Interlock / Flow-Dependent Shutdown | View Details |
| – |
Heater runs but pool water does not reach the set temperature or heats very slowly.
|
Insufficient Heating Capacity / Underperformance | View Details |
| – |
Heater trips the breaker or RCD immediately when turned on.
|
Short Circuit or Earth Leakage on Startup | View Details |
| – |
Heater’s flow switch rattles or chatters audibly during operation.
|
Unstable Flow at Flow Switch | View Details |
| – |
Heater’s internal components show signs of melting or discoloration around terminals.
|
Overheating of Electrical Connections | View Details |
| – |
Heater’s temperature reading drifts slowly over time, becoming inaccurate by several degrees.
|
Sensor Drift / Aging NTC | View Details |
No matching codes found
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