Chaffoteaux 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 does not ignite, display shows E01 and heating and hot water are unavailable.
Ignition Failure / Flame Not Detected
E02
Boiler locks out with E02, burner stops shortly after ignition or does not start, overheating sensation or very hot casing.
Overheat Thermostat Tripped / Safety Thermostat Intervention
E03
Boiler attempts to start but shuts down with E03, fan may run briefly, no flame established.
Flue Gas Safety / Flue Thermostat or Fume Sensor Intervention
E04
Boiler displays E04 and will not start; may occur intermittently when hot water or heating is demanded.
Water Pressure Fault / Low System Pressure
E05
Boiler shows E05, heating and/or hot water stop, temperature readings appear abnormal.
Flow Temperature Sensor (NTC) Fault
E06
Boiler displays E06, hot water temperature fluctuates or boiler shuts down during DHW draw-off.
Domestic Hot Water (DHW) Temperature Sensor Fault
E07
Boiler shows E07 and will not fire, often after a power cut or wiring disturbance.
Fan or Air Pressure Switch Fault
E08
Boiler locks out with E08, sometimes accompanied by gurgling noises, especially in cold weather.
Condensate Drain Blocked / Condensate System Fault
E09
Boiler shows E09, no heating or hot water, may occur after component replacement or wiring work.
Control Board Communication / Internal Fault
E10
Boiler displays E10, system pressure may be high or low, safety valve may discharge water.
Water Pressure Too High / Expansion Vessel or Safety Valve Issue
E11
Boiler shows E11, heating may work but hot water does not, or vice versa.
Diverter Valve Positioning Fault
E12
Boiler intermittently shuts down with E12, especially during hot water use at low flow rates.
Flow Rate / Flow Sensor Fault (DHW)
E13
Boiler shows E13, fan runs but ignition does not proceed, often after flue or fan work.
Fan Speed / Combustion Control Fault
E14
Boiler displays E14, often associated with rapid temperature rise and short cycling.
Circulation Pump Fault / No Flow in Primary Circuit
E15
Boiler shows E15, may be accompanied by visible water inside the casing or at the base of the boiler.
Internal Leak Detected / Water Leak Safety
E16
Boiler intermittently shows E16, temperature readings appear inconsistent, boiler may cycle rapidly.
Return Temperature Sensor (NTC) Fault
E17
Boiler shows E17, often related to external control or thermostat issues; boiler may not respond to room thermostat.
External Control / Communication Fault
E18
Boiler displays E18, often after a power surge or lightning strike; boiler may be completely unresponsive or partially functional.
Power Supply / Low Voltage Fault
E19
Boiler shows E19, hot water temperature is unstable or excessively hot at taps.
DHW Overtemperature / Modulation Fault
E20
Boiler displays E20, burner shuts down unexpectedly during operation without obvious cause.
Flame Loss During Operation
Symptom
Boiler cycles on and off rapidly (short cycling) without reaching set temperature, no error code.
Short Cycling / Control or Sizing Issue
Symptom
Boiler display works but buttons or selector knobs do not respond or respond intermittently.
User Interface / Control Panel Fault
Symptom
Boiler does not start at all, display is blank or unlit, no response from controls.
No Power / Dead Boiler
Symptom
Boiler emits a burning or electrical smell, possibly with visible smoke or discoloration on the casing.
Overheating Electrical Component
Symptom
Boiler emits a strong smell of gas near the appliance, regardless of operation state.
Gas Leak at Boiler
Symptom
Boiler flue terminal shows signs of staining, dripping, or plume appears abnormal, but boiler continues to run.
Flue Gas / Condensate Discharge Issue
Symptom
Boiler frequently locks out and requires manual reset, but no specific error code is stored or displayed.
Intermittent Lockout / Unstable Operation
Symptom
Boiler frequently loses pressure and needs to be topped up every few days, no visible leaks and no error code.
Chronic Pressure Loss
Symptom
Boiler is excessively noisy during operation (whining, grinding, or rattling sounds).
Mechanical Noise / Wear
Symptom
Boiler leaking water from underneath the casing or from pipe connections, no specific error code displayed.
General Hydraulic Leak
Symptom
Boiler makes loud banging or knocking noises (kettling) during operation, especially when heating starts or stops.
Kettling / Localised Boiling in Heat Exchanger
Symptom
Boiler provides heating but no domestic hot water, or hot water is only lukewarm, no error code.
No DHW / Priority Fault
Symptom
Boiler provides hot water but no central heating, even though the room thermostat is calling for heat.
No Central Heating Output
Symptom
Boiler runs but radiators do not get hot or only partially heat up, no error code displayed.
Poor Heating Performance / Circulation Issue
Symptom
Boiler starts then shuts down after a few seconds, repeatedly, without showing an error code.
Failed Ignition Stabilisation / Early Flame Loss
Symptom
Hot water temperature fluctuates between hot and cold during shower use, without any error code.
Intermittent DHW Temperature Control
Symptom
Radiators are hot at the top but cold at the bottom, while the boiler appears to operate normally.
Sludge Build-Up in Radiators
| Error Code | Symptom | Fault Type | Guide |
|---|---|---|---|
| E01 |
Boiler does not ignite, display shows E01 and heating and hot water are unavailable.
|
Ignition Failure / Flame Not Detected | View Details |
| E02 |
Boiler locks out with E02, burner stops shortly after ignition or does not start, overheating sensation or very hot casing.
|
Overheat Thermostat Tripped / Safety Thermostat Intervention | View Details |
| E03 |
Boiler attempts to start but shuts down with E03, fan may run briefly, no flame established.
|
Flue Gas Safety / Flue Thermostat or Fume Sensor Intervention | View Details |
| E04 |
Boiler displays E04 and will not start; may occur intermittently when hot water or heating is demanded.
|
Water Pressure Fault / Low System Pressure | View Details |
| E05 |
Boiler shows E05, heating and/or hot water stop, temperature readings appear abnormal.
|
Flow Temperature Sensor (NTC) Fault | View Details |
| E06 |
Boiler displays E06, hot water temperature fluctuates or boiler shuts down during DHW draw-off.
|
Domestic Hot Water (DHW) Temperature Sensor Fault | View Details |
| E07 |
Boiler shows E07 and will not fire, often after a power cut or wiring disturbance.
|
Fan or Air Pressure Switch Fault | View Details |
| E08 |
Boiler locks out with E08, sometimes accompanied by gurgling noises, especially in cold weather.
|
Condensate Drain Blocked / Condensate System Fault | View Details |
| E09 |
Boiler shows E09, no heating or hot water, may occur after component replacement or wiring work.
|
Control Board Communication / Internal Fault | View Details |
| E10 |
Boiler displays E10, system pressure may be high or low, safety valve may discharge water.
|
Water Pressure Too High / Expansion Vessel or Safety Valve Issue | View Details |
| E11 |
Boiler shows E11, heating may work but hot water does not, or vice versa.
|
Diverter Valve Positioning Fault | View Details |
| E12 |
Boiler intermittently shuts down with E12, especially during hot water use at low flow rates.
|
Flow Rate / Flow Sensor Fault (DHW) | View Details |
| E13 |
Boiler shows E13, fan runs but ignition does not proceed, often after flue or fan work.
|
Fan Speed / Combustion Control Fault | View Details |
| E14 |
Boiler displays E14, often associated with rapid temperature rise and short cycling.
|
Circulation Pump Fault / No Flow in Primary Circuit | View Details |
| E15 |
Boiler shows E15, may be accompanied by visible water inside the casing or at the base of the boiler.
|
Internal Leak Detected / Water Leak Safety | View Details |
| E16 |
Boiler intermittently shows E16, temperature readings appear inconsistent, boiler may cycle rapidly.
|
Return Temperature Sensor (NTC) Fault | View Details |
| E17 |
Boiler shows E17, often related to external control or thermostat issues; boiler may not respond to room thermostat.
|
External Control / Communication Fault | View Details |
| E18 |
Boiler displays E18, often after a power surge or lightning strike; boiler may be completely unresponsive or partially functional.
|
Power Supply / Low Voltage Fault | View Details |
| E19 |
Boiler shows E19, hot water temperature is unstable or excessively hot at taps.
|
DHW Overtemperature / Modulation Fault | View Details |
| E20 |
Boiler displays E20, burner shuts down unexpectedly during operation without obvious cause.
|
Flame Loss During Operation | View Details |
| – |
Boiler cycles on and off rapidly (short cycling) without reaching set temperature, no error code.
|
Short Cycling / Control or Sizing Issue | View Details |
| – |
Boiler display works but buttons or selector knobs do not respond or respond intermittently.
|
User Interface / Control Panel Fault | View Details |
| – |
Boiler does not start at all, display is blank or unlit, no response from controls.
|
No Power / Dead Boiler | View Details |
| – |
Boiler emits a burning or electrical smell, possibly with visible smoke or discoloration on the casing.
|
Overheating Electrical Component | View Details |
| – |
Boiler emits a strong smell of gas near the appliance, regardless of operation state.
|
Gas Leak at Boiler | View Details |
| – |
Boiler flue terminal shows signs of staining, dripping, or plume appears abnormal, but boiler continues to run.
|
Flue Gas / Condensate Discharge Issue | View Details |
| – |
Boiler frequently locks out and requires manual reset, but no specific error code is stored or displayed.
|
Intermittent Lockout / Unstable Operation | View Details |
| – |
Boiler frequently loses pressure and needs to be topped up every few days, no visible leaks and no error code.
|
Chronic Pressure Loss | View Details |
| – |
Boiler is excessively noisy during operation (whining, grinding, or rattling sounds).
|
Mechanical Noise / Wear | View Details |
| – |
Boiler leaking water from underneath the casing or from pipe connections, no specific error code displayed.
|
General Hydraulic Leak | View Details |
| – |
Boiler makes loud banging or knocking noises (kettling) during operation, especially when heating starts or stops.
|
Kettling / Localised Boiling in Heat Exchanger | View Details |
| – |
Boiler provides heating but no domestic hot water, or hot water is only lukewarm, no error code.
|
No DHW / Priority Fault | View Details |
| – |
Boiler provides hot water but no central heating, even though the room thermostat is calling for heat.
|
No Central Heating Output | View Details |
| – |
Boiler runs but radiators do not get hot or only partially heat up, no error code displayed.
|
Poor Heating Performance / Circulation Issue | View Details |
| – |
Boiler starts then shuts down after a few seconds, repeatedly, without showing an error code.
|
Failed Ignition Stabilisation / Early Flame Loss | View Details |
| – |
Hot water temperature fluctuates between hot and cold during shower use, without any error code.
|
Intermittent DHW Temperature Control | View Details |
| – |
Radiators are hot at the top but cold at the bottom, while the boiler appears to operate normally.
|
Sludge Build-Up in Radiators | View Details |
No matching codes found
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