Atlantic
Atlantic Water Heaters Error Codes
Complete list of fault codes and troubleshooting guides. Use the search below to find your specific error.
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E1
Atlantic electric water heater does not heat; control panel shows E1 shortly after power-up.
Tank Temperature Sensor Failure
E10
Atlantic heat-pump water heater displays E10 and the compressor will not start.
Low Refrigerant Pressure / Low-Pressure Switch Open
E11
Atlantic heat-pump water heater shows E11 and stops; fan may not run.
Fan Motor Fault
E12
Atlantic heat-pump water heater displays E12; compressor does not start or stops quickly.
Compressor Overload / Overcurrent Protection
E13
Atlantic heat-pump water heater shows E13 and stops; may occur in cold ambient conditions.
Defrost Cycle Fault
E14
Atlantic water heater with electronic anode displays E14; anode status LED may be red.
Electronic Anti-Corrosion Anode Fault
E15
Atlantic water heater shows E15; unit may still heat but indicates a fault.
Anode Monitoring Circuit Fault
E2
Atlantic water heater shows E2 and stops heating; display may show abnormal temperature readings.
Outlet Temperature Sensor Failure
E20
Atlantic water heater shows E20 and does not respond to button presses.
Keypad / Touch Panel Fault
E21
Atlantic water heater displays E21; unit may not heat or may behave erratically.
Internal Memory / Configuration Error
E3
Atlantic digital water heater displays E3 and does not heat; sometimes occurs after overheating event.
Overheat Protection / Safety Thermostat Tripped
E30
Atlantic water heater with Wi-Fi or smart control shows E30; remote control via app fails.
Communication Module Fault
E4
Atlantic water heater shows E4 and stops heating; may occur during filling or after maintenance.
Dry-Fire / No Water in Tank Detected
E40
Atlantic water heater shows E40 and heating is disabled; may be accompanied by a water leak.
Leak Detection / Drip Tray Sensor Activated
E41
Atlantic water heater shows E41; unit may not fill or may shut down.
Flow Sensor / Flow Switch Fault
E5
Atlantic digital water heater shows E5 and refuses to start heating.
Communication Error Between Display Panel and Main Control Board
E50
Atlantic water heater shows E50; heating may be limited or disabled.
Power Supply / Voltage Fault
E6
Atlantic water heater displays E6 and heating is disabled.
Internal Control Board Fault
E7
Atlantic hybrid or heat-pump water heater shows E7 and stops heating with the heat pump.
Evaporator Coil Temperature Sensor Fault
E8
Atlantic heat-pump water heater displays E8 and the compressor does not start.
Condenser Coil Temperature Sensor Fault
E9
Atlantic heat-pump water heater shows E9; unit may run briefly then shut down.
Ambient Air Temperature Sensor Fault
Symptom
Atlantic electric water heater does not heat at all; no error code displayed on basic models with mechanical thermostat.
Open Heating Element Circuit
Symptom
Atlantic heat-pump water heater produces insufficient hot water in winter.
Reduced Heat Pump Capacity in Low Ambient Temperature
Symptom
Atlantic water heater cycles on and off rapidly, with unstable water temperature.
Short Cycling Due to Sensor or Thermostat Issues
Symptom
Atlantic water heater does not fill with water or fills very slowly.
Restricted Cold Water Inlet / Safety Group Blockage
Symptom
Atlantic water heater does not start heating during off-peak hours as expected.
Off-Peak Control / External Signal Wiring Issue
Symptom
Atlantic water heater emits a metallic or sulfur (rotten egg) odor from hot water taps.
Bacterial Growth and Anode Reaction
Symptom
Atlantic water heater heats water but temperature is too low compared to thermostat setting.
Thermostat Calibration Drift / Partial Element Failure
Symptom
Atlantic water heater leaks water from the bottom or around the flange area.
Tank Flange Gasket Leak / Internal Tank Corrosion
Symptom
Atlantic water heater makes a humming or buzzing noise from the top module (heat pump models) during operation.
Normal Compressor Noise or Vibrational Resonance
Symptom
Atlantic water heater makes loud popping or crackling noises during heating.
Limescale Buildup on Heating Element
Symptom
Atlantic water heater outer casing is very hot to the touch during operation.
Insulation Degradation / Overheating
Symptom
Atlantic water heater produces rusty or discolored hot water.
Anode Depletion / Internal Tank Corrosion
Symptom
Atlantic water heater shows condensation or water droplets on the outer shell.
Condensation Due to Cold Tank Surface
Symptom
Atlantic water heater trips the circuit breaker or RCD (residual current device) when heating.
Ground Fault / Short Circuit in Heating Circuit
Symptom
Atlantic water heater's hot water pressure is significantly lower than cold water pressure.
Restricted Hot Water Outlet / Scaling
Symptom
Atlantic water heater's indicator light is off and unit appears completely dead.
No Power Supply to Heater
Symptom
Water dripping frequently from the Atlantic water heater safety valve discharge pipe.
Excessive Pressure Relief Valve Discharge
| Error Code | Symptom | Fault Type | Guide |
|---|---|---|---|
| E1 |
Atlantic electric water heater does not heat; control panel shows E1 shortly after power-up.
|
Tank Temperature Sensor Failure | View Details |
| E10 |
Atlantic heat-pump water heater displays E10 and the compressor will not start.
|
Low Refrigerant Pressure / Low-Pressure Switch Open | View Details |
| E11 |
Atlantic heat-pump water heater shows E11 and stops; fan may not run.
|
Fan Motor Fault | View Details |
| E12 |
Atlantic heat-pump water heater displays E12; compressor does not start or stops quickly.
|
Compressor Overload / Overcurrent Protection | View Details |
| E13 |
Atlantic heat-pump water heater shows E13 and stops; may occur in cold ambient conditions.
|
Defrost Cycle Fault | View Details |
| E14 |
Atlantic water heater with electronic anode displays E14; anode status LED may be red.
|
Electronic Anti-Corrosion Anode Fault | View Details |
| E15 |
Atlantic water heater shows E15; unit may still heat but indicates a fault.
|
Anode Monitoring Circuit Fault | View Details |
| E2 |
Atlantic water heater shows E2 and stops heating; display may show abnormal temperature readings.
|
Outlet Temperature Sensor Failure | View Details |
| E20 |
Atlantic water heater shows E20 and does not respond to button presses.
|
Keypad / Touch Panel Fault | View Details |
| E21 |
Atlantic water heater displays E21; unit may not heat or may behave erratically.
|
Internal Memory / Configuration Error | View Details |
| E3 |
Atlantic digital water heater displays E3 and does not heat; sometimes occurs after overheating event.
|
Overheat Protection / Safety Thermostat Tripped | View Details |
| E30 |
Atlantic water heater with Wi-Fi or smart control shows E30; remote control via app fails.
|
Communication Module Fault | View Details |
| E4 |
Atlantic water heater shows E4 and stops heating; may occur during filling or after maintenance.
|
Dry-Fire / No Water in Tank Detected | View Details |
| E40 |
Atlantic water heater shows E40 and heating is disabled; may be accompanied by a water leak.
|
Leak Detection / Drip Tray Sensor Activated | View Details |
| E41 |
Atlantic water heater shows E41; unit may not fill or may shut down.
|
Flow Sensor / Flow Switch Fault | View Details |
| E5 |
Atlantic digital water heater shows E5 and refuses to start heating.
|
Communication Error Between Display Panel and Main Control Board | View Details |
| E50 |
Atlantic water heater shows E50; heating may be limited or disabled.
|
Power Supply / Voltage Fault | View Details |
| E6 |
Atlantic water heater displays E6 and heating is disabled.
|
Internal Control Board Fault | View Details |
| E7 |
Atlantic hybrid or heat-pump water heater shows E7 and stops heating with the heat pump.
|
Evaporator Coil Temperature Sensor Fault | View Details |
| E8 |
Atlantic heat-pump water heater displays E8 and the compressor does not start.
|
Condenser Coil Temperature Sensor Fault | View Details |
| E9 |
Atlantic heat-pump water heater shows E9; unit may run briefly then shut down.
|
Ambient Air Temperature Sensor Fault | View Details |
| – |
Atlantic electric water heater does not heat at all; no error code displayed on basic models with mechanical thermostat.
|
Open Heating Element Circuit | View Details |
| – |
Atlantic heat-pump water heater produces insufficient hot water in winter.
|
Reduced Heat Pump Capacity in Low Ambient Temperature | View Details |
| – |
Atlantic water heater cycles on and off rapidly, with unstable water temperature.
|
Short Cycling Due to Sensor or Thermostat Issues | View Details |
| – |
Atlantic water heater does not fill with water or fills very slowly.
|
Restricted Cold Water Inlet / Safety Group Blockage | View Details |
| – |
Atlantic water heater does not start heating during off-peak hours as expected.
|
Off-Peak Control / External Signal Wiring Issue | View Details |
| – |
Atlantic water heater emits a metallic or sulfur (rotten egg) odor from hot water taps.
|
Bacterial Growth and Anode Reaction | View Details |
| – |
Atlantic water heater heats water but temperature is too low compared to thermostat setting.
|
Thermostat Calibration Drift / Partial Element Failure | View Details |
| – |
Atlantic water heater leaks water from the bottom or around the flange area.
|
Tank Flange Gasket Leak / Internal Tank Corrosion | View Details |
| – |
Atlantic water heater makes a humming or buzzing noise from the top module (heat pump models) during operation.
|
Normal Compressor Noise or Vibrational Resonance | View Details |
| – |
Atlantic water heater makes loud popping or crackling noises during heating.
|
Limescale Buildup on Heating Element | View Details |
| – |
Atlantic water heater outer casing is very hot to the touch during operation.
|
Insulation Degradation / Overheating | View Details |
| – |
Atlantic water heater produces rusty or discolored hot water.
|
Anode Depletion / Internal Tank Corrosion | View Details |
| – |
Atlantic water heater shows condensation or water droplets on the outer shell.
|
Condensation Due to Cold Tank Surface | View Details |
| – |
Atlantic water heater trips the circuit breaker or RCD (residual current device) when heating.
|
Ground Fault / Short Circuit in Heating Circuit | View Details |
| – |
Atlantic water heater's hot water pressure is significantly lower than cold water pressure.
|
Restricted Hot Water Outlet / Scaling | View Details |
| – |
Atlantic water heater's indicator light is off and unit appears completely dead.
|
No Power Supply to Heater | View Details |
| – |
Water dripping frequently from the Atlantic water heater safety valve discharge pipe.
|
Excessive Pressure Relief Valve Discharge | View Details |
No matching codes found
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