Weishaupt
Weishaupt Boilers Error Codes
Complete list of fault codes and troubleshooting guides. Use the search below to find your specific error.
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E01
Boiler locks out shortly after start, red lockout lamp on burner control, no flame established.
Ignition Failure / No Flame Signal
E02
Boiler attempts to start but shuts down with fault code E02, fan runs but no ignition sequence continues.
Air Pressure / Fan Proving Fault
E03
Boiler locks out with E03, burner starts then shuts down after a few seconds, sometimes with rumbling noise.
Flame Loss During Operation
E04
Boiler shows E04 and will not start, overheat or safety thermostat has tripped.
Overheat Thermostat Trip
E05
Boiler displays E05, no heating or hot water, flow temperature sensor fault indicated.
Flow Temperature Sensor (NTC) Failure
E06
Boiler shows E06, domestic hot water temperature unstable or no hot water, DHW sensor fault.
DHW Temperature Sensor (NTC) Failure
E07
Boiler locks out with E07, fan does not start, no pre-purge.
Fan Motor / Fan Control Fault
E08
Boiler shows E08, burner control indicates gas valve fault, no gas flow to burner.
Gas Valve / Gas Train Fault
E09
Boiler displays E09, flue gas temperature too high, burner shuts down.
Flue Gas Overtemperature
E10
Boiler shows E10, low water pressure or water shortage, boiler will not fire.
Low System Pressure / Water Shortage
E11
Boiler indicates E11, return temperature sensor fault, boiler may cycle rapidly or shut down.
Return Temperature Sensor (NTC) Failure
E12
Boiler shows E12, communication error between burner control and main boiler control.
Control Communication Fault
E13
Boiler displays E13, outside temperature sensor fault on weather-compensated systems.
Outdoor Temperature Sensor Failure
E14
Boiler shows E14, condensate fault, boiler shuts down to protect against flooding or flue blockage.
Condensate Drain / Level Fault
E15
Boiler indicates E15, safety chain open, burner cannot start.
Safety Interlock Chain Open
E16
Boiler shows E16, ionisation current too low, intermittent flame detection problems.
Weak Flame Signal
E17
Boiler displays E17, power supply fault or incorrect mains voltage detected.
Mains Supply / Voltage Fault
E18
Boiler shows E18, flue gas sensor fault or sensor short circuit.
Flue Gas Temperature Sensor Electrical Fault
E19
Boiler indicates E19, gas pressure too low or gas pressure switch open.
Low Gas Pressure / Gas Pressure Switch Fault
E20
Boiler shows E20, high gas pressure switch activated (where fitted).
High Gas Pressure Fault
E21
Boiler displays E21, burner motor overload or motor protection tripped (on larger Weishaupt burners).
Burner Motor Overload
E22
Boiler shows E22, oil pressure fault on Weishaupt oil burner (if configured).
Oil Pressure / Oil Supply Fault
E23
Boiler indicates E23, flue gas recirculation or CO₂ too high detected by safety system (where fitted).
Flue Gas Recirculation / Poor Combustion
E24
Boiler shows E24, internal memory or parameter error on control unit.
Control Parameter / EEPROM Fault
E25
Boiler displays E25, pump fault or no flow detected through boiler.
Circulation Pump / Flow Fault
E26
Boiler shows E26, sensor mismatch or implausible temperature readings between flow and return.
Temperature Sensor Plausibility Fault
E27
Boiler indicates E27, room thermostat or bus communication fault with Weishaupt room controller.
Room Control / Bus Communication Fault
E28
Boiler shows E28, flue gas fan speed feedback fault (on modulating fans).
Fan Speed / Tachometer Fault
E29
Boiler displays E29, internal time clock or scheduling module fault.
Internal Clock / Timer Fault
E30
Boiler shows E30, maximum number of failed ignition attempts reached, burner locked out.
Repeated Ignition Lockout
Symptom
Boiler cycles on and off rapidly without reaching set temperature.
Short Cycling
Symptom
Boiler display shows normal operation but building does not reach set room temperature.
Underheating / Control Mismatch
Symptom
Boiler does not start at all, no display or lights.
No Power / Dead Boiler
Symptom
Boiler emits unusual smells (burning, metallic, or flue gas odour) during operation.
Odour / Combustion or Electrical Smell
Symptom
Boiler frequently loses pressure and needs regular topping up.
Chronic Pressure Loss
Symptom
Boiler is very noisy (whistling, roaring, or vibration) during burner operation.
Excessive Combustion Noise / Vibration
Symptom
Boiler leaking water from underneath the casing or at pipe connections.
System Water Leak / Internal Leak
Symptom
Boiler makes loud banging or knocking noises (kettling) during operation.
Boiler Kettling / Localised Boiling
Symptom
Boiler provides heating but no domestic hot water (on combi or integrated DHW systems).
No DHW Production
Symptom
Boiler room or casing shows signs of soot or black deposits around burner or flue connection.
Sooting / Incomplete Combustion
Symptom
Boiler runs but radiators remain cold or only lukewarm.
Poor Heating Performance / No Circulation
Symptom
Boiler starts but shuts down after a short time without showing an error code.
Intermittent Operation / Soft Lockout
Symptom
Condensing boiler produces little or no condensate despite frequent operation.
Lack of Condensation in Condensing Boiler
| Error Code | Symptom | Fault Type | Guide |
|---|---|---|---|
| E01 |
Boiler locks out shortly after start, red lockout lamp on burner control, no flame established.
|
Ignition Failure / No Flame Signal | View Details |
| E02 |
Boiler attempts to start but shuts down with fault code E02, fan runs but no ignition sequence continues.
|
Air Pressure / Fan Proving Fault | View Details |
| E03 |
Boiler locks out with E03, burner starts then shuts down after a few seconds, sometimes with rumbling noise.
|
Flame Loss During Operation | View Details |
| E04 |
Boiler shows E04 and will not start, overheat or safety thermostat has tripped.
|
Overheat Thermostat Trip | View Details |
| E05 |
Boiler displays E05, no heating or hot water, flow temperature sensor fault indicated.
|
Flow Temperature Sensor (NTC) Failure | View Details |
| E06 |
Boiler shows E06, domestic hot water temperature unstable or no hot water, DHW sensor fault.
|
DHW Temperature Sensor (NTC) Failure | View Details |
| E07 |
Boiler locks out with E07, fan does not start, no pre-purge.
|
Fan Motor / Fan Control Fault | View Details |
| E08 |
Boiler shows E08, burner control indicates gas valve fault, no gas flow to burner.
|
Gas Valve / Gas Train Fault | View Details |
| E09 |
Boiler displays E09, flue gas temperature too high, burner shuts down.
|
Flue Gas Overtemperature | View Details |
| E10 |
Boiler shows E10, low water pressure or water shortage, boiler will not fire.
|
Low System Pressure / Water Shortage | View Details |
| E11 |
Boiler indicates E11, return temperature sensor fault, boiler may cycle rapidly or shut down.
|
Return Temperature Sensor (NTC) Failure | View Details |
| E12 |
Boiler shows E12, communication error between burner control and main boiler control.
|
Control Communication Fault | View Details |
| E13 |
Boiler displays E13, outside temperature sensor fault on weather-compensated systems.
|
Outdoor Temperature Sensor Failure | View Details |
| E14 |
Boiler shows E14, condensate fault, boiler shuts down to protect against flooding or flue blockage.
|
Condensate Drain / Level Fault | View Details |
| E15 |
Boiler indicates E15, safety chain open, burner cannot start.
|
Safety Interlock Chain Open | View Details |
| E16 |
Boiler shows E16, ionisation current too low, intermittent flame detection problems.
|
Weak Flame Signal | View Details |
| E17 |
Boiler displays E17, power supply fault or incorrect mains voltage detected.
|
Mains Supply / Voltage Fault | View Details |
| E18 |
Boiler shows E18, flue gas sensor fault or sensor short circuit.
|
Flue Gas Temperature Sensor Electrical Fault | View Details |
| E19 |
Boiler indicates E19, gas pressure too low or gas pressure switch open.
|
Low Gas Pressure / Gas Pressure Switch Fault | View Details |
| E20 |
Boiler shows E20, high gas pressure switch activated (where fitted).
|
High Gas Pressure Fault | View Details |
| E21 |
Boiler displays E21, burner motor overload or motor protection tripped (on larger Weishaupt burners).
|
Burner Motor Overload | View Details |
| E22 |
Boiler shows E22, oil pressure fault on Weishaupt oil burner (if configured).
|
Oil Pressure / Oil Supply Fault | View Details |
| E23 |
Boiler indicates E23, flue gas recirculation or CO₂ too high detected by safety system (where fitted).
|
Flue Gas Recirculation / Poor Combustion | View Details |
| E24 |
Boiler shows E24, internal memory or parameter error on control unit.
|
Control Parameter / EEPROM Fault | View Details |
| E25 |
Boiler displays E25, pump fault or no flow detected through boiler.
|
Circulation Pump / Flow Fault | View Details |
| E26 |
Boiler shows E26, sensor mismatch or implausible temperature readings between flow and return.
|
Temperature Sensor Plausibility Fault | View Details |
| E27 |
Boiler indicates E27, room thermostat or bus communication fault with Weishaupt room controller.
|
Room Control / Bus Communication Fault | View Details |
| E28 |
Boiler shows E28, flue gas fan speed feedback fault (on modulating fans).
|
Fan Speed / Tachometer Fault | View Details |
| E29 |
Boiler displays E29, internal time clock or scheduling module fault.
|
Internal Clock / Timer Fault | View Details |
| E30 |
Boiler shows E30, maximum number of failed ignition attempts reached, burner locked out.
|
Repeated Ignition Lockout | View Details |
| – |
Boiler cycles on and off rapidly without reaching set temperature.
|
Short Cycling | View Details |
| – |
Boiler display shows normal operation but building does not reach set room temperature.
|
Underheating / Control Mismatch | View Details |
| – |
Boiler does not start at all, no display or lights.
|
No Power / Dead Boiler | View Details |
| – |
Boiler emits unusual smells (burning, metallic, or flue gas odour) during operation.
|
Odour / Combustion or Electrical Smell | View Details |
| – |
Boiler frequently loses pressure and needs regular topping up.
|
Chronic Pressure Loss | View Details |
| – |
Boiler is very noisy (whistling, roaring, or vibration) during burner operation.
|
Excessive Combustion Noise / Vibration | View Details |
| – |
Boiler leaking water from underneath the casing or at pipe connections.
|
System Water Leak / Internal Leak | View Details |
| – |
Boiler makes loud banging or knocking noises (kettling) during operation.
|
Boiler Kettling / Localised Boiling | View Details |
| – |
Boiler provides heating but no domestic hot water (on combi or integrated DHW systems).
|
No DHW Production | View Details |
| – |
Boiler room or casing shows signs of soot or black deposits around burner or flue connection.
|
Sooting / Incomplete Combustion | View Details |
| – |
Boiler runs but radiators remain cold or only lukewarm.
|
Poor Heating Performance / No Circulation | View Details |
| – |
Boiler starts but shuts down after a short time without showing an error code.
|
Intermittent Operation / Soft Lockout | View Details |
| – |
Condensing boiler produces little or no condensate despite frequent operation.
|
Lack of Condensation in Condensing Boiler | View Details |
No matching codes found
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