Beretta
Beretta Furnaces Error Codes
Complete list of fault codes and troubleshooting guides. Use the search below to find your specific error.
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A01
Furnace locks out with A01 on display, burner does not ignite, fan may run briefly then stop
Ignition Failure / No Flame Detection
A02
Furnace shows A02 and shuts down shortly after ignition attempt, flame appears but goes out quickly
Flame Loss During Operation
A03
Display shows A03, furnace stops and may attempt restart, overheat indicator lit on control board
Overheat / Safety Thermostat Tripped
A04
Furnace shows A04, burner does not start, fan may run briefly, flue fan may not start
Flue Gas Safety / Flue Overheat or Flue Thermostat Trip
A05
Display shows A05, furnace stops, may occur during strong wind or poor draft conditions
Flue Gas Pressure / Draft Fault
A06
Furnace shows A06, attempts to start but shuts down quickly, sometimes with visible spark but no stable flame
Ignition Lockout / Repeated Failed Ignitions
A07
Display shows A07, furnace stops, may occur after long operation or in hot mechanical rooms
Fan Overheat / Fan Motor Thermal Trip
A08
Furnace shows A08, burner does not start, may be accompanied by abnormal fan behavior
Fan Speed / Tachometer Fault
A09
Display shows A09, furnace stops, may occur intermittently during operation
Gas Valve Control Fault
A10
Furnace shows A10, no heating demand recognized even when thermostat is calling for heat
Room Thermostat / Demand Signal Fault
A11
Display shows A11, furnace does not start, may be associated with external safety devices
External Safety Circuit Open
A12
Furnace shows A12, burner shuts down and may restart after a delay
Flame Signal Too Weak / Ionization Fault
A13
Display shows A13, furnace may continue to run at reduced performance or lock out depending on model
Flow Temperature Sensor Fault
A14
Furnace shows A14, may prevent operation or cause erratic temperature control
Return Temperature Sensor Fault
A15
Display shows A15, furnace may shut down on high temperature or fail to modulate correctly
Safety Limit or Overheat Sensor Fault
A16
Furnace shows A16, unit does not start, may be associated with low system water pressure on hydronic models
Low Water Pressure / Pressure Switch Open
A17
Display shows A17, furnace may run at reduced output or shut down
Flow Switch / Circulation Fault
A18
Furnace shows A18, may indicate condensate drainage problem on condensing models
Condensate Drain Fault
A19
Display shows A19, furnace may not respond to external control signals
Communication Fault with External Controller
E01
Furnace shows E01, immediate lockout, no ignition sequence starts
General Ignition Lockout / Safety Shutdown
E02
Display shows E02, furnace stops, may be related to overtemperature or sensor error
Overtemperature or Flow Sensor Error
E03
Furnace shows E03, flue fan may run continuously or not at all
Flue Fan / Air Pressure Switch Error
E04
Display shows E04, furnace may lock out after detecting abnormal flame signal
Flame Detection Error (Flame Present When Not Requested or Signal Noise)
E05
Furnace shows E05, may indicate a problem with the return temperature sensor
Return NTC Sensor Error
E06
Display shows E06, furnace may not respond to user commands or remote control
User Interface / Communication Error
E07
Furnace shows E07, may indicate a problem with the gas valve modulation or current draw
Gas Valve Modulation Error
E08
Display shows E08, furnace may shut down due to detected internal board fault
Internal Control Board Error
Symptom
Furnace does not start at all, no lights on display, completely dead
No Power / Main Supply Failure
Symptom
Furnace emits a burning smell when it starts, especially after long periods of inactivity
Dust Burn-Off / Overheating Components
Symptom
Furnace emits a chemical or plastic smell during operation
Overheating Plastic Components / Contaminants
Symptom
Furnace frequently trips the household circuit breaker or blows fuses
Electrical Short Circuit / Overcurrent
Symptom
Furnace is running but some rooms are too cold while others are too hot
Uneven Heating / Airflow Imbalance
Symptom
Furnace makes loud banging or booming noise at startup
Delayed Ignition / Burner Light-Off Problem
Symptom
Furnace produces a high-pitched whine or loud humming during operation
Fan or Inducer Noise / Mechanical Wear
Symptom
Furnace runs but produces no heat, supply air is cold or only slightly warm
No Heat Output / Burner Not Firing
Symptom
Furnace runs continuously and overheats the house, does not shut off at set temperature
Thermostat or Control Stuck On
Symptom
Furnace short cycles, turning on and off frequently without reaching set temperature
Short Cycling / Poor Heat Transfer
Symptom
Furnace starts but shuts down when blower starts, sometimes with noticeable duct movement
Airflow-Induced Flame Instability
Symptom
Furnace vibrates excessively and can be felt through the floor or ductwork
Excessive Vibration / Imbalanced Fan
Symptom
Thermostat calls for heat but furnace starts and stops within a few seconds repeatedly
Failed Ignition Sequence / Lockout Not Yet Latched
Symptom
Visible rust or water stains on or around the heat exchanger area
Heat Exchanger Corrosion / Potential Crack
Symptom
Water leaking from the bottom of the furnace cabinet
Condensate Leak / Internal Water Leak
| Error Code | Symptom | Fault Type | Guide |
|---|---|---|---|
| A01 |
Furnace locks out with A01 on display, burner does not ignite, fan may run briefly then stop
|
Ignition Failure / No Flame Detection | View Details |
| A02 |
Furnace shows A02 and shuts down shortly after ignition attempt, flame appears but goes out quickly
|
Flame Loss During Operation | View Details |
| A03 |
Display shows A03, furnace stops and may attempt restart, overheat indicator lit on control board
|
Overheat / Safety Thermostat Tripped | View Details |
| A04 |
Furnace shows A04, burner does not start, fan may run briefly, flue fan may not start
|
Flue Gas Safety / Flue Overheat or Flue Thermostat Trip | View Details |
| A05 |
Display shows A05, furnace stops, may occur during strong wind or poor draft conditions
|
Flue Gas Pressure / Draft Fault | View Details |
| A06 |
Furnace shows A06, attempts to start but shuts down quickly, sometimes with visible spark but no stable flame
|
Ignition Lockout / Repeated Failed Ignitions | View Details |
| A07 |
Display shows A07, furnace stops, may occur after long operation or in hot mechanical rooms
|
Fan Overheat / Fan Motor Thermal Trip | View Details |
| A08 |
Furnace shows A08, burner does not start, may be accompanied by abnormal fan behavior
|
Fan Speed / Tachometer Fault | View Details |
| A09 |
Display shows A09, furnace stops, may occur intermittently during operation
|
Gas Valve Control Fault | View Details |
| A10 |
Furnace shows A10, no heating demand recognized even when thermostat is calling for heat
|
Room Thermostat / Demand Signal Fault | View Details |
| A11 |
Display shows A11, furnace does not start, may be associated with external safety devices
|
External Safety Circuit Open | View Details |
| A12 |
Furnace shows A12, burner shuts down and may restart after a delay
|
Flame Signal Too Weak / Ionization Fault | View Details |
| A13 |
Display shows A13, furnace may continue to run at reduced performance or lock out depending on model
|
Flow Temperature Sensor Fault | View Details |
| A14 |
Furnace shows A14, may prevent operation or cause erratic temperature control
|
Return Temperature Sensor Fault | View Details |
| A15 |
Display shows A15, furnace may shut down on high temperature or fail to modulate correctly
|
Safety Limit or Overheat Sensor Fault | View Details |
| A16 |
Furnace shows A16, unit does not start, may be associated with low system water pressure on hydronic models
|
Low Water Pressure / Pressure Switch Open | View Details |
| A17 |
Display shows A17, furnace may run at reduced output or shut down
|
Flow Switch / Circulation Fault | View Details |
| A18 |
Furnace shows A18, may indicate condensate drainage problem on condensing models
|
Condensate Drain Fault | View Details |
| A19 |
Display shows A19, furnace may not respond to external control signals
|
Communication Fault with External Controller | View Details |
| E01 |
Furnace shows E01, immediate lockout, no ignition sequence starts
|
General Ignition Lockout / Safety Shutdown | View Details |
| E02 |
Display shows E02, furnace stops, may be related to overtemperature or sensor error
|
Overtemperature or Flow Sensor Error | View Details |
| E03 |
Furnace shows E03, flue fan may run continuously or not at all
|
Flue Fan / Air Pressure Switch Error | View Details |
| E04 |
Display shows E04, furnace may lock out after detecting abnormal flame signal
|
Flame Detection Error (Flame Present When Not Requested or Signal Noise) | View Details |
| E05 |
Furnace shows E05, may indicate a problem with the return temperature sensor
|
Return NTC Sensor Error | View Details |
| E06 |
Display shows E06, furnace may not respond to user commands or remote control
|
User Interface / Communication Error | View Details |
| E07 |
Furnace shows E07, may indicate a problem with the gas valve modulation or current draw
|
Gas Valve Modulation Error | View Details |
| E08 |
Display shows E08, furnace may shut down due to detected internal board fault
|
Internal Control Board Error | View Details |
| – |
Furnace does not start at all, no lights on display, completely dead
|
No Power / Main Supply Failure | View Details |
| – |
Furnace emits a burning smell when it starts, especially after long periods of inactivity
|
Dust Burn-Off / Overheating Components | View Details |
| – |
Furnace emits a chemical or plastic smell during operation
|
Overheating Plastic Components / Contaminants | View Details |
| – |
Furnace frequently trips the household circuit breaker or blows fuses
|
Electrical Short Circuit / Overcurrent | View Details |
| – |
Furnace is running but some rooms are too cold while others are too hot
|
Uneven Heating / Airflow Imbalance | View Details |
| – |
Furnace makes loud banging or booming noise at startup
|
Delayed Ignition / Burner Light-Off Problem | View Details |
| – |
Furnace produces a high-pitched whine or loud humming during operation
|
Fan or Inducer Noise / Mechanical Wear | View Details |
| – |
Furnace runs but produces no heat, supply air is cold or only slightly warm
|
No Heat Output / Burner Not Firing | View Details |
| – |
Furnace runs continuously and overheats the house, does not shut off at set temperature
|
Thermostat or Control Stuck On | View Details |
| – |
Furnace short cycles, turning on and off frequently without reaching set temperature
|
Short Cycling / Poor Heat Transfer | View Details |
| – |
Furnace starts but shuts down when blower starts, sometimes with noticeable duct movement
|
Airflow-Induced Flame Instability | View Details |
| – |
Furnace vibrates excessively and can be felt through the floor or ductwork
|
Excessive Vibration / Imbalanced Fan | View Details |
| – |
Thermostat calls for heat but furnace starts and stops within a few seconds repeatedly
|
Failed Ignition Sequence / Lockout Not Yet Latched | View Details |
| – |
Visible rust or water stains on or around the heat exchanger area
|
Heat Exchanger Corrosion / Potential Crack | View Details |
| – |
Water leaking from the bottom of the furnace cabinet
|
Condensate Leak / Internal Water Leak | View Details |
No matching codes found
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