Ariston 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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E01
Ariston electric water heater does not heat; display shows E01 and water remains cold.
Heating Element Circuit Failure
E02
Ariston water heater shows E02 and shuts down; water temperature is unstable or cold.
NTC Temperature Sensor Failure (Tank Sensor)
E03
Display shows E03 and the Ariston water heater does not start heating; sometimes trips safety thermostat.
Overtemperature / Safety Thermostat Trip
E04
Ariston gas water heater shows E04 and burner does not ignite or shuts down quickly.
Flame Detection / Ionization Failure
E05
Ariston gas water heater displays E05; unit attempts to ignite but fails, often with clicking sounds.
Ignition Failure
E06
Ariston gas water heater shows E06 and shuts down during operation; water may suddenly go cold.
Exhaust / Flue Gas Sensor Fault (Overheat or Sensor Error)
E07
Ariston gas water heater displays E07 and will not run; often associated with fan-type models.
Fan or Air Pressure Switch Fault
E08
Ariston water heater shows E08; unit may overheat or not regulate temperature correctly.
Outlet Temperature Sensor Fault
E09
Ariston electric water heater shows E09 and does not heat; sometimes accompanied by tripping of the breaker.
Earth Leakage / Ground Fault
E10
Ariston instant electric water heater shows E10 and does not start heating when tap is opened.
Flow Sensor / Flow Switch Failure
E11
Ariston water heater shows E11; unit may heat only at maximum or not regulate power correctly.
Triac / Power Control Fault
E12
Ariston water heater displays E12; unit may lock out and not respond to controls.
Internal Communication / EEPROM Error
E13
Ariston gas water heater shows E13; unit may shut down shortly after ignition.
Overheat at Heat Exchanger / High Limit Sensor Trip
E14
Ariston water heater shows E14; unit may not respond to user input or buttons.
User Interface / Keypad Fault
E15
Ariston water heater shows E15; unit may intermittently shut down or restart.
Power Supply / Low Voltage Fault
E16
Ariston gas water heater shows E16; unit may lock out after several failed ignition attempts.
Gas Valve / Modulation Fault
E20
Ariston hybrid/heat-pump water heater shows E20; heat pump mode disabled, unit may run only on electric backup.
Compressor / Refrigerant Circuit Fault
Symptom
Ariston gas water heater does not detect water flow; burner does not start when tap is opened.
Water Flow Switch / Turbine Failure (Gas Model)
Symptom
Ariston gas water heater ignites but shuts off after a few seconds; hot water stops quickly.
Flame Loss During Operation
Symptom
Ariston gas water heater makes loud banging or popping noises during operation.
Delayed Ignition / Combustion Noise
Symptom
Ariston instant electric water heater runs but water temperature fluctuates rapidly (hot-cold-hot).
Temperature Instability / Flow-Temperature Mismatch
Symptom
Ariston storage water heater makes rumbling or popping noises when heating.
Sediment / Limescale Boiling Noise
Symptom
Ariston water heater does not power on; no lights or display.
No Power / Supply Failure
Symptom
Ariston water heater emits a burning smell or shows signs of melted plastic near the wiring compartment.
Overheated Electrical Connections
Symptom
Ariston water heater frequently cycles on and off, even when no hot water is being used.
Standby Heat Loss / Thermostat Hysteresis Issue
Symptom
Ariston water heater installed in a cold area freezes or shows signs of frost damage.
Freeze Damage / Burst Components
Symptom
Ariston water heater produces very little or no hot water, but the tank feels hot or heats briefly then runs cold.
Dip Tube Failure / Hot-Cold Mixing in Tank
Symptom
Ariston water heater trips the circuit breaker or RCD/GFCI when heating.
Electrical Short or Ground Fault
Symptom
Ariston water heater vibrates excessively or makes humming noises when heating.
Mechanical Vibration / Mounting Issues
Symptom
Ariston water heater's digital display works, but buttons do not respond or respond intermittently.
Keypad / Touch Panel Malfunction
Symptom
Ariston water heater's hot water appears rusty or discolored.
Internal Corrosion / Anode Depletion
Symptom
Ariston water heater's hot water has a metallic or rotten egg (sulfur) smell.
Water Quality / Anode Reaction
Symptom
Water dripping from the temperature and pressure (T&P) relief valve discharge pipe on an Ariston storage heater.
T&P Relief Valve Discharge
Symptom
Water from Ariston heater is not hot enough or runs lukewarm, but unit appears to be operating.
Insufficient Heating / One Element Not Working
Symptom
Water heater leaks from bottom of Ariston storage tank.
Tank Corrosion / Internal Tank Rupture
Symptom
Water heater leaks from the heating element flange area on an Ariston storage heater.
Element Gasket Failure / Flange Seal Leak
Symptom
Water is too hot from an Ariston storage water heater, even at low thermostat settings.
Thermostat Stuck Closed / Control Failure
| Error Code | Symptom | Fault Type | Guide |
|---|---|---|---|
| E01 |
Ariston electric water heater does not heat; display shows E01 and water remains cold.
|
Heating Element Circuit Failure | View Details |
| E02 |
Ariston water heater shows E02 and shuts down; water temperature is unstable or cold.
|
NTC Temperature Sensor Failure (Tank Sensor) | View Details |
| E03 |
Display shows E03 and the Ariston water heater does not start heating; sometimes trips safety thermostat.
|
Overtemperature / Safety Thermostat Trip | View Details |
| E04 |
Ariston gas water heater shows E04 and burner does not ignite or shuts down quickly.
|
Flame Detection / Ionization Failure | View Details |
| E05 |
Ariston gas water heater displays E05; unit attempts to ignite but fails, often with clicking sounds.
|
Ignition Failure | View Details |
| E06 |
Ariston gas water heater shows E06 and shuts down during operation; water may suddenly go cold.
|
Exhaust / Flue Gas Sensor Fault (Overheat or Sensor Error) | View Details |
| E07 |
Ariston gas water heater displays E07 and will not run; often associated with fan-type models.
|
Fan or Air Pressure Switch Fault | View Details |
| E08 |
Ariston water heater shows E08; unit may overheat or not regulate temperature correctly.
|
Outlet Temperature Sensor Fault | View Details |
| E09 |
Ariston electric water heater shows E09 and does not heat; sometimes accompanied by tripping of the breaker.
|
Earth Leakage / Ground Fault | View Details |
| E10 |
Ariston instant electric water heater shows E10 and does not start heating when tap is opened.
|
Flow Sensor / Flow Switch Failure | View Details |
| E11 |
Ariston water heater shows E11; unit may heat only at maximum or not regulate power correctly.
|
Triac / Power Control Fault | View Details |
| E12 |
Ariston water heater displays E12; unit may lock out and not respond to controls.
|
Internal Communication / EEPROM Error | View Details |
| E13 |
Ariston gas water heater shows E13; unit may shut down shortly after ignition.
|
Overheat at Heat Exchanger / High Limit Sensor Trip | View Details |
| E14 |
Ariston water heater shows E14; unit may not respond to user input or buttons.
|
User Interface / Keypad Fault | View Details |
| E15 |
Ariston water heater shows E15; unit may intermittently shut down or restart.
|
Power Supply / Low Voltage Fault | View Details |
| E16 |
Ariston gas water heater shows E16; unit may lock out after several failed ignition attempts.
|
Gas Valve / Modulation Fault | View Details |
| E20 |
Ariston hybrid/heat-pump water heater shows E20; heat pump mode disabled, unit may run only on electric backup.
|
Compressor / Refrigerant Circuit Fault | View Details |
| – |
Ariston gas water heater does not detect water flow; burner does not start when tap is opened.
|
Water Flow Switch / Turbine Failure (Gas Model) | View Details |
| – |
Ariston gas water heater ignites but shuts off after a few seconds; hot water stops quickly.
|
Flame Loss During Operation | View Details |
| – |
Ariston gas water heater makes loud banging or popping noises during operation.
|
Delayed Ignition / Combustion Noise | View Details |
| – |
Ariston instant electric water heater runs but water temperature fluctuates rapidly (hot-cold-hot).
|
Temperature Instability / Flow-Temperature Mismatch | View Details |
| – |
Ariston storage water heater makes rumbling or popping noises when heating.
|
Sediment / Limescale Boiling Noise | View Details |
| – |
Ariston water heater does not power on; no lights or display.
|
No Power / Supply Failure | View Details |
| – |
Ariston water heater emits a burning smell or shows signs of melted plastic near the wiring compartment.
|
Overheated Electrical Connections | View Details |
| – |
Ariston water heater frequently cycles on and off, even when no hot water is being used.
|
Standby Heat Loss / Thermostat Hysteresis Issue | View Details |
| – |
Ariston water heater installed in a cold area freezes or shows signs of frost damage.
|
Freeze Damage / Burst Components | View Details |
| – |
Ariston water heater produces very little or no hot water, but the tank feels hot or heats briefly then runs cold.
|
Dip Tube Failure / Hot-Cold Mixing in Tank | View Details |
| – |
Ariston water heater trips the circuit breaker or RCD/GFCI when heating.
|
Electrical Short or Ground Fault | View Details |
| – |
Ariston water heater vibrates excessively or makes humming noises when heating.
|
Mechanical Vibration / Mounting Issues | View Details |
| – |
Ariston water heater's digital display works, but buttons do not respond or respond intermittently.
|
Keypad / Touch Panel Malfunction | View Details |
| – |
Ariston water heater's hot water appears rusty or discolored.
|
Internal Corrosion / Anode Depletion | View Details |
| – |
Ariston water heater's hot water has a metallic or rotten egg (sulfur) smell.
|
Water Quality / Anode Reaction | View Details |
| – |
Water dripping from the temperature and pressure (T&P) relief valve discharge pipe on an Ariston storage heater.
|
T&P Relief Valve Discharge | View Details |
| – |
Water from Ariston heater is not hot enough or runs lukewarm, but unit appears to be operating.
|
Insufficient Heating / One Element Not Working | View Details |
| – |
Water heater leaks from bottom of Ariston storage tank.
|
Tank Corrosion / Internal Tank Rupture | View Details |
| – |
Water heater leaks from the heating element flange area on an Ariston storage heater.
|
Element Gasket Failure / Flange Seal Leak | View Details |
| – |
Water is too hot from an Ariston storage water heater, even at low thermostat settings.
|
Thermostat Stuck Closed / Control Failure | View Details |
No matching codes found
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