Beretta
Beretta 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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A01
The water heater does not ignite; the display shows A01 and the burner never lights.
Ignition Failure Lockout
A02
The burner lights but shuts down shortly after; the display shows A02.
Flame Loss During Operation
A03
The water heater shuts down with A03; the unit becomes very hot before locking out.
Primary Heat Exchanger Overheat / Safety Thermostat Trip
A04
The display shows A04 and the burner does not start; the fan may run briefly.
Flue Gas Overheat / Flue Safety Thermostat Trip
A05
The unit locks out with A05; the fan may run but the burner does not ignite.
Air Pressure Switch / Fan Proving Fault
A06
The display shows A06; the burner shuts down intermittently during operation.
Flame Instability / Ionization Signal Error
A07
A07 is displayed; the unit does not start or stops quickly.
Domestic Hot Water NTC Sensor Fault
A08
A08 error; the heater may run at an incorrect temperature or not at all.
Flow Temperature NTC Sensor Fault
A09
A09 displayed; heater may overheat or not regulate temperature correctly.
Return Temperature NTC Sensor Fault
A10
A10 error; no hot water despite demand, or unit cycles rapidly.
Flow Switch / Flow Sensor Fault
A11
A11 displayed; unit may not start or shows erratic behavior.
Fan Speed / Tachometer Fault
A12
A12 error; appliance refuses to start after multiple resets.
Permanent Lockout / Safety Lock
A13
A13 displayed; heater may start but then shut down with temperature anomalies.
Primary Circuit Sensor Correlation Error
A14
A14 error; unit may not modulate correctly or may shut down.
Gas Valve Modulation Fault
A15
A15 displayed; heater may not respond to user settings.
User Interface / Communication Fault
A16
A16 error; heater may not start or may shut down unexpectedly.
Safety Thermostat Chain Fault
A17
A17 displayed; unit may show incorrect temperatures or behave erratically.
Ambient / External Sensor Fault
A18
A18 error; heater may not detect demand correctly.
Room Thermostat / Demand Signal Fault
A19
A19 displayed; unit may lock out during operation.
Internal Overtemperature / Limit Fault
A20
A20 error; heater may not start and shows low or zero pressure.
Low Water Pressure / Low System Pressure
E01
E01 displayed; no ignition, similar to A01 on some models.
Ignition Failure
E02
E02 displayed; unit overheats and shuts down.
Overheat Thermostat Trip
E03
E03 displayed; fan runs but burner does not ignite.
Flue / Fan / Air Pressure Fault
E04
E04 displayed; burner lights then goes out.
Flame Detection Fault
E05
E05 displayed; no hot water or incorrect temperature control.
DHW Temperature Sensor Fault
E06
E06 displayed; unit may overheat or show wrong temperatures.
Flow/Return NTC Fault
E07
E07 displayed; heater does not start, may show low pressure.
Water Pressure Switch / Sensor Fault
E08
E08 displayed; unit may not modulate or may lock out.
Gas Valve / Modulation Error
E09
E09 displayed; unit may not respond to controls.
Internal Communication Error
E10
E10 displayed; heater may not start and shows fan-related issues.
Fan / Airflow Fault
Symptom
Water heater cycles on and off rapidly when a small amount of hot water is drawn
Short Cycling on Low DHW Demand
Symptom
Water heater delivers lukewarm water only, not reaching the set temperature.
Insufficient DHW Temperature / Underheating
Symptom
Water heater emits a burning smell or plastic odor during operation
Overheating of Components / Electrical Smell
Symptom
Water heater emits a high-pitched whine or humming during operation.
Acoustic Noise from Fan or Gas Valve
Symptom
Water heater leaks water from the bottom of the casing.
Internal Water Leak
Symptom
Water heater makes loud banging or knocking noises when starting or stopping.
Water Hammer / Thermal Expansion Noise
Symptom
Water heater produces no hot water at all, but no error code is displayed.
No DHW Production Without Fault Code
Symptom
Water heater shows correct temperature but water at taps is much cooler or hotter
Temperature Sensing / Calibration Error
Symptom
Water heater temperature fluctuates: hot-cold-hot during a shower.
DHW Temperature Oscillation
Symptom
Water heater trips the household circuit breaker or RCD when it starts
Electrical Short or Earth Leakage
Symptom
Water heater vibrates excessively when running.
Mechanical Vibration / Imbalance
Symptom
Water heater will not power on at all; display is blank
No Power / Dead Appliance
Symptom
Water heater's display works but buttons do not respond
User Interface Keypad Failure
Symptom
Water heater's flue terminal shows white staining or dripping condensate.
Condensate Management / Flue Condensation Issue
Symptom
Water heater's hot water flow is very low compared to cold taps
Restricted DHW Flow
Symptom
Water heater's pilot (on older Beretta models) will not stay lit
Pilot Flame Holding Fault
| Error Code | Symptom | Fault Type | Guide |
|---|---|---|---|
| A01 |
The water heater does not ignite; the display shows A01 and the burner never lights.
|
Ignition Failure Lockout | View Details |
| A02 |
The burner lights but shuts down shortly after; the display shows A02.
|
Flame Loss During Operation | View Details |
| A03 |
The water heater shuts down with A03; the unit becomes very hot before locking out.
|
Primary Heat Exchanger Overheat / Safety Thermostat Trip | View Details |
| A04 |
The display shows A04 and the burner does not start; the fan may run briefly.
|
Flue Gas Overheat / Flue Safety Thermostat Trip | View Details |
| A05 |
The unit locks out with A05; the fan may run but the burner does not ignite.
|
Air Pressure Switch / Fan Proving Fault | View Details |
| A06 |
The display shows A06; the burner shuts down intermittently during operation.
|
Flame Instability / Ionization Signal Error | View Details |
| A07 |
A07 is displayed; the unit does not start or stops quickly.
|
Domestic Hot Water NTC Sensor Fault | View Details |
| A08 |
A08 error; the heater may run at an incorrect temperature or not at all.
|
Flow Temperature NTC Sensor Fault | View Details |
| A09 |
A09 displayed; heater may overheat or not regulate temperature correctly.
|
Return Temperature NTC Sensor Fault | View Details |
| A10 |
A10 error; no hot water despite demand, or unit cycles rapidly.
|
Flow Switch / Flow Sensor Fault | View Details |
| A11 |
A11 displayed; unit may not start or shows erratic behavior.
|
Fan Speed / Tachometer Fault | View Details |
| A12 |
A12 error; appliance refuses to start after multiple resets.
|
Permanent Lockout / Safety Lock | View Details |
| A13 |
A13 displayed; heater may start but then shut down with temperature anomalies.
|
Primary Circuit Sensor Correlation Error | View Details |
| A14 |
A14 error; unit may not modulate correctly or may shut down.
|
Gas Valve Modulation Fault | View Details |
| A15 |
A15 displayed; heater may not respond to user settings.
|
User Interface / Communication Fault | View Details |
| A16 |
A16 error; heater may not start or may shut down unexpectedly.
|
Safety Thermostat Chain Fault | View Details |
| A17 |
A17 displayed; unit may show incorrect temperatures or behave erratically.
|
Ambient / External Sensor Fault | View Details |
| A18 |
A18 error; heater may not detect demand correctly.
|
Room Thermostat / Demand Signal Fault | View Details |
| A19 |
A19 displayed; unit may lock out during operation.
|
Internal Overtemperature / Limit Fault | View Details |
| A20 |
A20 error; heater may not start and shows low or zero pressure.
|
Low Water Pressure / Low System Pressure | View Details |
| E01 |
E01 displayed; no ignition, similar to A01 on some models.
|
Ignition Failure | View Details |
| E02 |
E02 displayed; unit overheats and shuts down.
|
Overheat Thermostat Trip | View Details |
| E03 |
E03 displayed; fan runs but burner does not ignite.
|
Flue / Fan / Air Pressure Fault | View Details |
| E04 |
E04 displayed; burner lights then goes out.
|
Flame Detection Fault | View Details |
| E05 |
E05 displayed; no hot water or incorrect temperature control.
|
DHW Temperature Sensor Fault | View Details |
| E06 |
E06 displayed; unit may overheat or show wrong temperatures.
|
Flow/Return NTC Fault | View Details |
| E07 |
E07 displayed; heater does not start, may show low pressure.
|
Water Pressure Switch / Sensor Fault | View Details |
| E08 |
E08 displayed; unit may not modulate or may lock out.
|
Gas Valve / Modulation Error | View Details |
| E09 |
E09 displayed; unit may not respond to controls.
|
Internal Communication Error | View Details |
| E10 |
E10 displayed; heater may not start and shows fan-related issues.
|
Fan / Airflow Fault | View Details |
| – |
Water heater cycles on and off rapidly when a small amount of hot water is drawn
|
Short Cycling on Low DHW Demand | View Details |
| – |
Water heater delivers lukewarm water only, not reaching the set temperature.
|
Insufficient DHW Temperature / Underheating | View Details |
| – |
Water heater emits a burning smell or plastic odor during operation
|
Overheating of Components / Electrical Smell | View Details |
| – |
Water heater emits a high-pitched whine or humming during operation.
|
Acoustic Noise from Fan or Gas Valve | View Details |
| – |
Water heater leaks water from the bottom of the casing.
|
Internal Water Leak | View Details |
| – |
Water heater makes loud banging or knocking noises when starting or stopping.
|
Water Hammer / Thermal Expansion Noise | View Details |
| – |
Water heater produces no hot water at all, but no error code is displayed.
|
No DHW Production Without Fault Code | View Details |
| – |
Water heater shows correct temperature but water at taps is much cooler or hotter
|
Temperature Sensing / Calibration Error | View Details |
| – |
Water heater temperature fluctuates: hot-cold-hot during a shower.
|
DHW Temperature Oscillation | View Details |
| – |
Water heater trips the household circuit breaker or RCD when it starts
|
Electrical Short or Earth Leakage | View Details |
| – |
Water heater vibrates excessively when running.
|
Mechanical Vibration / Imbalance | View Details |
| – |
Water heater will not power on at all; display is blank
|
No Power / Dead Appliance | View Details |
| – |
Water heater's display works but buttons do not respond
|
User Interface Keypad Failure | View Details |
| – |
Water heater's flue terminal shows white staining or dripping condensate.
|
Condensate Management / Flue Condensation Issue | View Details |
| – |
Water heater's hot water flow is very low compared to cold taps
|
Restricted DHW Flow | View Details |
| – |
Water heater's pilot (on older Beretta models) will not stay lit
|
Pilot Flame Holding Fault | View Details |
No matching codes found
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