Brötje
Brötje 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
Burner does not ignite, furnace attempts start then locks out with A01 on display
Ignition failure / no flame detection
A02
Burner starts briefly then shuts down, A02 flame loss error displayed
Flame loss during operation
A03
Furnace locks out with A03, overheat condition, boiler very hot to touch
Safety temperature limiter (STB) tripped / overtemperature
A04
Display shows A04, no burner operation, boiler indicates low water pressure.
Low system water pressure / water shortage
A05
Boiler shows A05, burner blocked, flue gas temperature too high.
Flue gas overtemperature / blocked heat exchanger
A06
Display shows A06, boiler does not start, fan symbol may flash.
Fan / air pressure fault
A07
Boiler shows A07, ignition sequence aborted, no fan pre-purge detected.
Fan start failure / no air flow
A08
Error A08, boiler stops, display indicates flue gas sensor fault.
Flue gas sensor open/short circuit
A09
Boiler locks out with A09, display may indicate flow sensor fault.
Flow temperature sensor error
A10
Display shows A10, return temperature sensor fault, boiler stops.
Return temperature sensor error
A11
Boiler shows A11, domestic hot water (DHW) sensor fault, no hot water.
DHW temperature sensor error
A12
Error A12, boiler indicates outside sensor fault, weather-compensated control not working.
Outdoor temperature sensor error
A13
Boiler shows A13, no communication with room controller or EMS bus device.
Bus communication fault (e.g., ISR/EMS/eBUS)
A14
Display shows A14; boiler indicates a gas type or parameter error after commissioning.
Configuration/Parameterization Fault
A15
Boiler shows A15; condensate fault, unit shuts down.
Condensate Drainage Fault
A16
Error A16; boiler indicates a flue blockage or differential pressure fault.
Flue Gas Path Obstruction
A17
Boiler shows A17; ionization signal present without flame, immediate lockout.
False Flame Detection/Ionization Fault
A18
Error A18; boiler indicates a pump fault, no circulation.
Heating Circulation Pump Failure
A19
Boiler shows A19; safety chain open, no burner operation.
Safety Interlock Open (e.g., limit thermostat, flue thermostat, external safety)
A20
Display shows A20; gas pressure switch fault (if fitted).
Gas Pressure Supervision Fault
E01
E01 displayed; general burner lockout, red fault LED lit.
General Burner Fault (Lockout)
E02
E02 displayed; overheat or limit thermostat trip.
Overtemperature Shutdown
E03
E03 displayed; flue gas safety device triggered.
Flue Gas Safety/Spillage Fault
E04
E04 displayed, low water pressure lockout.
Water pressure below minimum threshold.
E05
E05 displayed, flow sensor or NTC error.
Temperature sensor fault (flow).
E06
E06 displayed, return sensor or NTC error.
Temperature sensor fault (return).
E07
E07 displayed, fan or air pressure fault.
Insufficient airflow / fan error.
E08
E08 displayed, ionisation fault / no flame signal.
No flame detection.
E09
E09 displayed, gas valve or gas train fault.
Gas valve control error.
E10
E10 displayed, communication error with expansion module or cascade controller.
Module communication fault.
Symptom
Boiler display is blank, no response to buttons, but mains power is present.
No power to control board / Control board failure
Symptom
Boiler display works but is very dim or has missing segments.
Display module degradation
Symptom
Condensate water is dripping from flue joints or outside wall penetration.
Condensate Leakage from Flue System
Symptom
Domestic hot water temperature fluctuates or is too hot/cold without an error code.
Unstable DHW Control
Symptom
Furnace emits whistling or high-pitched noise during operation.
Gas/airflow resonance or restriction.
Symptom
Furnace makes loud banging or knocking noises when starting or stopping.
Water hammer / thermal expansion noise.
Symptom
Furnace runs but radiators stay lukewarm, long heat-up times, no error code.
Insufficient heating output / undersized or modulating incorrectly.
Symptom
Persistent smell of gas near the Brötje furnace, with no error code displayed.
Gas Leak
Symptom
Radiators on upper floors are cold while lower floors heat normally.
Air Lock / Circulation Imbalance
Symptom
Soot deposits around the flue terminal or on the boiler casing, with no immediate error code displayed.
Incomplete Combustion / Sooting
Symptom
The boiler does not start when the room thermostat calls for heat, but no fault code is shown.
Control Signal / Thermostat Wiring Issue
Symptom
The boiler frequently cycles on and off with short run times, and no error code is displayed.
Short Cycling
Symptom
The boiler pressure rises rapidly when heating and discharges water from the safety valve.
Expansion Vessel Failure / Overpressure
Symptom
The furnace causes strong vibration transmitted into the flue or wall.
Mechanical Imbalance / Mounting Issue
Symptom
Water is leaking from the bottom of the Brötje furnace casing.
Internal Water Leak
| Error Code | Symptom | Fault Type | Guide |
|---|---|---|---|
| A01 |
Burner does not ignite, furnace attempts start then locks out with A01 on display
|
Ignition failure / no flame detection | View Details |
| A02 |
Burner starts briefly then shuts down, A02 flame loss error displayed
|
Flame loss during operation | View Details |
| A03 |
Furnace locks out with A03, overheat condition, boiler very hot to touch
|
Safety temperature limiter (STB) tripped / overtemperature | View Details |
| A04 |
Display shows A04, no burner operation, boiler indicates low water pressure.
|
Low system water pressure / water shortage | View Details |
| A05 |
Boiler shows A05, burner blocked, flue gas temperature too high.
|
Flue gas overtemperature / blocked heat exchanger | View Details |
| A06 |
Display shows A06, boiler does not start, fan symbol may flash.
|
Fan / air pressure fault | View Details |
| A07 |
Boiler shows A07, ignition sequence aborted, no fan pre-purge detected.
|
Fan start failure / no air flow | View Details |
| A08 |
Error A08, boiler stops, display indicates flue gas sensor fault.
|
Flue gas sensor open/short circuit | View Details |
| A09 |
Boiler locks out with A09, display may indicate flow sensor fault.
|
Flow temperature sensor error | View Details |
| A10 |
Display shows A10, return temperature sensor fault, boiler stops.
|
Return temperature sensor error | View Details |
| A11 |
Boiler shows A11, domestic hot water (DHW) sensor fault, no hot water.
|
DHW temperature sensor error | View Details |
| A12 |
Error A12, boiler indicates outside sensor fault, weather-compensated control not working.
|
Outdoor temperature sensor error | View Details |
| A13 |
Boiler shows A13, no communication with room controller or EMS bus device.
|
Bus communication fault (e.g., ISR/EMS/eBUS) | View Details |
| A14 |
Display shows A14; boiler indicates a gas type or parameter error after commissioning.
|
Configuration/Parameterization Fault | View Details |
| A15 |
Boiler shows A15; condensate fault, unit shuts down.
|
Condensate Drainage Fault | View Details |
| A16 |
Error A16; boiler indicates a flue blockage or differential pressure fault.
|
Flue Gas Path Obstruction | View Details |
| A17 |
Boiler shows A17; ionization signal present without flame, immediate lockout.
|
False Flame Detection/Ionization Fault | View Details |
| A18 |
Error A18; boiler indicates a pump fault, no circulation.
|
Heating Circulation Pump Failure | View Details |
| A19 |
Boiler shows A19; safety chain open, no burner operation.
|
Safety Interlock Open (e.g., limit thermostat, flue thermostat, external safety) | View Details |
| A20 |
Display shows A20; gas pressure switch fault (if fitted).
|
Gas Pressure Supervision Fault | View Details |
| E01 |
E01 displayed; general burner lockout, red fault LED lit.
|
General Burner Fault (Lockout) | View Details |
| E02 |
E02 displayed; overheat or limit thermostat trip.
|
Overtemperature Shutdown | View Details |
| E03 |
E03 displayed; flue gas safety device triggered.
|
Flue Gas Safety/Spillage Fault | View Details |
| E04 |
E04 displayed, low water pressure lockout.
|
Water pressure below minimum threshold. | View Details |
| E05 |
E05 displayed, flow sensor or NTC error.
|
Temperature sensor fault (flow). | View Details |
| E06 |
E06 displayed, return sensor or NTC error.
|
Temperature sensor fault (return). | View Details |
| E07 |
E07 displayed, fan or air pressure fault.
|
Insufficient airflow / fan error. | View Details |
| E08 |
E08 displayed, ionisation fault / no flame signal.
|
No flame detection. | View Details |
| E09 |
E09 displayed, gas valve or gas train fault.
|
Gas valve control error. | View Details |
| E10 |
E10 displayed, communication error with expansion module or cascade controller.
|
Module communication fault. | View Details |
| – |
Boiler display is blank, no response to buttons, but mains power is present.
|
No power to control board / Control board failure | View Details |
| – |
Boiler display works but is very dim or has missing segments.
|
Display module degradation | View Details |
| – |
Condensate water is dripping from flue joints or outside wall penetration.
|
Condensate Leakage from Flue System | View Details |
| – |
Domestic hot water temperature fluctuates or is too hot/cold without an error code.
|
Unstable DHW Control | View Details |
| – |
Furnace emits whistling or high-pitched noise during operation.
|
Gas/airflow resonance or restriction. | View Details |
| – |
Furnace makes loud banging or knocking noises when starting or stopping.
|
Water hammer / thermal expansion noise. | View Details |
| – |
Furnace runs but radiators stay lukewarm, long heat-up times, no error code.
|
Insufficient heating output / undersized or modulating incorrectly. | View Details |
| – |
Persistent smell of gas near the Brötje furnace, with no error code displayed.
|
Gas Leak | View Details |
| – |
Radiators on upper floors are cold while lower floors heat normally.
|
Air Lock / Circulation Imbalance | View Details |
| – |
Soot deposits around the flue terminal or on the boiler casing, with no immediate error code displayed.
|
Incomplete Combustion / Sooting | View Details |
| – |
The boiler does not start when the room thermostat calls for heat, but no fault code is shown.
|
Control Signal / Thermostat Wiring Issue | View Details |
| – |
The boiler frequently cycles on and off with short run times, and no error code is displayed.
|
Short Cycling | View Details |
| – |
The boiler pressure rises rapidly when heating and discharges water from the safety valve.
|
Expansion Vessel Failure / Overpressure | View Details |
| – |
The furnace causes strong vibration transmitted into the flue or wall.
|
Mechanical Imbalance / Mounting Issue | View Details |
| – |
Water is leaking from the bottom of the Brötje furnace casing.
|
Internal Water Leak | View Details |
No matching codes found
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