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
Water heater does not ignite; display shows A01 and burner never lights
Ignition Failure Lockout
A02
Burner lights but shuts down shortly after; display shows A02
Flame Loss During Operation
A03
Water heater shuts down with A03; unit becomes very hot before locking out
Primary Heat Exchanger Overheat / Safety Thermostat Trip
A04
Display shows A04 and burner does not start; fan may run briefly
Flue Gas Overheat / Flue Safety Thermostat Trip
A05
Unit locks out with A05; fan may run but burner does not ignite
Air Pressure Switch / Fan Proving Fault
A06
Display shows A06; burner shuts down intermittently during operation
Flame Instability / Ionization Signal Error
A07
A07 displayed; unit does not start or stops quickly
Domestic Hot Water NTC Sensor Fault
A08
A08 error; heater may run at 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 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 |
Water heater does not ignite; display shows A01 and burner never lights
|
Ignition Failure Lockout | View Details |
| A02 |
Burner lights but shuts down shortly after; display shows A02
|
Flame Loss During Operation | View Details |
| A03 |
Water heater shuts down with A03; unit becomes very hot before locking out
|
Primary Heat Exchanger Overheat / Safety Thermostat Trip | View Details |
| A04 |
Display shows A04 and burner does not start; fan may run briefly
|
Flue Gas Overheat / Flue Safety Thermostat Trip | View Details |
| A05 |
Unit locks out with A05; fan may run but burner does not ignite
|
Air Pressure Switch / Fan Proving Fault | View Details |
| A06 |
Display shows A06; burner shuts down intermittently during operation
|
Flame Instability / Ionization Signal Error | View Details |
| A07 |
A07 displayed; unit does not start or stops quickly
|
Domestic Hot Water NTC Sensor Fault | View Details |
| A08 |
A08 error; heater may run at 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 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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