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