Chaffoteaux Furnaces Error Codes
Complete list of fault codes and troubleshooting guides. Use the search below to find your specific error.
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E01
Furnace fails to ignite, burner does not light, display shows E01 shortly after a heating demand.
Ignition Failure / No Flame Detection
E02
Furnace locks out with E02, fan may run briefly, burner does not start.
Flue Gas Safety / Overheat Lockout
E03
Furnace attempts to start, fan runs, then stops with E03 on the display.
Flue Gas / Air Pressure Switch Fault
E04
Furnace stops and displays E04, often after running for a short time; may relate to overheating.
Primary Circuit Overheat / Flow Temperature Fault
E05
Furnace shows E05 and does not start; may occur immediately on power-up.
Flow Temperature Sensor (NTC) Fault
E06
Furnace locks out with E06, often when there is a demand for domestic hot water (if combi) or during heating.
Return Temperature Sensor (NTC) Fault
E07
Furnace displays E07 and stops; may be associated with flue gas or safety issues.
Flue Gas Temperature Sensor / Safety Fault
E08
The furnace displays E08 and may attempt to start but shuts down quickly.
Fan / Flue Fan Fault
E09
The furnace locks out with E09, often related to water pressure or flow issues.
Low Water Pressure / Water Pressure Sensor Fault
E10
The furnace displays E10 and will not operate; this may be associated with circulation problems.
Circulation Fault / No Flow Detected
E11
The furnace displays E11, often related to domestic hot water (DHW) demand on combi models.
DHW Flow Sensor / Turbine Fault
E12
The furnace locks out with E12, often after ignition; this may indicate flame instability.
Flame Loss During Operation
E13
The furnace displays E13, which may be associated with condensate or flue issues.
Condensate Drain / Siphon Fault
E14
The furnace displays E14 and will not operate; this often indicates an internal electronics issue.
Control Board / EEPROM Fault
E15
The furnace displays E15, which may be related to the gas valve or modulation control.
Gas Valve Control Fault
E16
The furnace intermittently stops with E16, often during DHW operation on combi models.
DHW Temperature Sensor (NTC) Fault
E17
The furnace displays E17, often associated with external controls or communication.
Communication Fault with Room Thermostat / Bus
E18
Furnace displays E18; this may be related to ionization current or grounding.
Flame Ionization / Grounding Fault
E19
Furnace displays E19 and stops; this may be associated with pump or fan speed feedback.
Modulation / Speed Feedback Fault
E20
Furnace displays E20, often immediately after power-up or a reset.
General Safety Lockout / Multiple Faults Detected
Symptom
Domestic hot water temperature fluctuates between hot and cold during use (combi models).
Unstable DHW Temperature
Symptom
Furnace cycles on and off rapidly when providing domestic hot water, with noticeable temperature swings.
DHW Flow Control / Modulation Issue
Symptom
Radiators get hot even when the room thermostat is turned down or off.
Heating Running Continuously
Symptom
The furnace display works, but buttons or controls on the fascia do not respond.
User Interface / Keypad Fault
Symptom
The furnace does not start at all; there are no lights or display, indicating it is completely dead.
No Power / Supply Failure
Symptom
The furnace fan is very loud, with rattling or scraping noises coming from the flue fan area.
Fan Bearing Failure / Imbalance
Symptom
The furnace frequently goes into lockout during very cold weather, with no specific code or intermittent codes.
Condensate Freezing / Flue Icing
Symptom
The furnace frequently loses pressure and requires frequent topping up.
Chronic Pressure Loss
Symptom
The furnace frequently trips the household RCD or blows fuses.
Electrical Short / Earth Leakage
Symptom
The furnace has power but does not respond to the room thermostat; no heating demand is indicated.
Control / Thermostat Signal Failure
Symptom
The furnace operates but makes loud banging or knocking noises in the heat exchanger or pipework.
Kettling / Boiling in Heat Exchanger
Symptom
The furnace or flue emits a strong gas smell.
Gas Leak / Combustion Leak
Symptom
The furnace or nearby pipework is leaking water.
Water Leak from Hydraulic Circuit
Symptom
The furnace runs but produces a high-pitched whine or grinding noise from the pump area.
Pump Bearing Wear / Cavitation
Symptom
The furnace runs, but radiators remain cold or only lukewarm.
Insufficient Heating Output / Circulation Problem
Symptom
The furnace starts but shuts down after a few seconds, repeatedly cycling without heating the system properly.
Short Cycling / Poor Heat Transfer
Symptom
The furnace starts with a loud boom or popping noise at ignition.
Delayed Ignition
Symptom
Visible yellow or orange, lazy flames instead of sharp blue flames (where the flame is visible).
Poor Combustion / Incomplete Burning
| Error Code | Symptom | Fault Type | Guide |
|---|---|---|---|
| E01 |
Furnace fails to ignite, burner does not light, display shows E01 shortly after a heating demand.
|
Ignition Failure / No Flame Detection | View Details |
| E02 |
Furnace locks out with E02, fan may run briefly, burner does not start.
|
Flue Gas Safety / Overheat Lockout | View Details |
| E03 |
Furnace attempts to start, fan runs, then stops with E03 on the display.
|
Flue Gas / Air Pressure Switch Fault | View Details |
| E04 |
Furnace stops and displays E04, often after running for a short time; may relate to overheating.
|
Primary Circuit Overheat / Flow Temperature Fault | View Details |
| E05 |
Furnace shows E05 and does not start; may occur immediately on power-up.
|
Flow Temperature Sensor (NTC) Fault | View Details |
| E06 |
Furnace locks out with E06, often when there is a demand for domestic hot water (if combi) or during heating.
|
Return Temperature Sensor (NTC) Fault | View Details |
| E07 |
Furnace displays E07 and stops; may be associated with flue gas or safety issues.
|
Flue Gas Temperature Sensor / Safety Fault | View Details |
| E08 |
The furnace displays E08 and may attempt to start but shuts down quickly.
|
Fan / Flue Fan Fault | View Details |
| E09 |
The furnace locks out with E09, often related to water pressure or flow issues.
|
Low Water Pressure / Water Pressure Sensor Fault | View Details |
| E10 |
The furnace displays E10 and will not operate; this may be associated with circulation problems.
|
Circulation Fault / No Flow Detected | View Details |
| E11 |
The furnace displays E11, often related to domestic hot water (DHW) demand on combi models.
|
DHW Flow Sensor / Turbine Fault | View Details |
| E12 |
The furnace locks out with E12, often after ignition; this may indicate flame instability.
|
Flame Loss During Operation | View Details |
| E13 |
The furnace displays E13, which may be associated with condensate or flue issues.
|
Condensate Drain / Siphon Fault | View Details |
| E14 |
The furnace displays E14 and will not operate; this often indicates an internal electronics issue.
|
Control Board / EEPROM Fault | View Details |
| E15 |
The furnace displays E15, which may be related to the gas valve or modulation control.
|
Gas Valve Control Fault | View Details |
| E16 |
The furnace intermittently stops with E16, often during DHW operation on combi models.
|
DHW Temperature Sensor (NTC) Fault | View Details |
| E17 |
The furnace displays E17, often associated with external controls or communication.
|
Communication Fault with Room Thermostat / Bus | View Details |
| E18 |
Furnace displays E18; this may be related to ionization current or grounding.
|
Flame Ionization / Grounding Fault | View Details |
| E19 |
Furnace displays E19 and stops; this may be associated with pump or fan speed feedback.
|
Modulation / Speed Feedback Fault | View Details |
| E20 |
Furnace displays E20, often immediately after power-up or a reset.
|
General Safety Lockout / Multiple Faults Detected | View Details |
| – |
Domestic hot water temperature fluctuates between hot and cold during use (combi models).
|
Unstable DHW Temperature | View Details |
| – |
Furnace cycles on and off rapidly when providing domestic hot water, with noticeable temperature swings.
|
DHW Flow Control / Modulation Issue | View Details |
| – |
Radiators get hot even when the room thermostat is turned down or off.
|
Heating Running Continuously | View Details |
| – |
The furnace display works, but buttons or controls on the fascia do not respond.
|
User Interface / Keypad Fault | View Details |
| – |
The furnace does not start at all; there are no lights or display, indicating it is completely dead.
|
No Power / Supply Failure | View Details |
| – |
The furnace fan is very loud, with rattling or scraping noises coming from the flue fan area.
|
Fan Bearing Failure / Imbalance | View Details |
| – |
The furnace frequently goes into lockout during very cold weather, with no specific code or intermittent codes.
|
Condensate Freezing / Flue Icing | View Details |
| – |
The furnace frequently loses pressure and requires frequent topping up.
|
Chronic Pressure Loss | View Details |
| – |
The furnace frequently trips the household RCD or blows fuses.
|
Electrical Short / Earth Leakage | View Details |
| – |
The furnace has power but does not respond to the room thermostat; no heating demand is indicated.
|
Control / Thermostat Signal Failure | View Details |
| – |
The furnace operates but makes loud banging or knocking noises in the heat exchanger or pipework.
|
Kettling / Boiling in Heat Exchanger | View Details |
| – |
The furnace or flue emits a strong gas smell.
|
Gas Leak / Combustion Leak | View Details |
| – |
The furnace or nearby pipework is leaking water.
|
Water Leak from Hydraulic Circuit | View Details |
| – |
The furnace runs but produces a high-pitched whine or grinding noise from the pump area.
|
Pump Bearing Wear / Cavitation | View Details |
| – |
The furnace runs, but radiators remain cold or only lukewarm.
|
Insufficient Heating Output / Circulation Problem | View Details |
| – |
The furnace starts but shuts down after a few seconds, repeatedly cycling without heating the system properly.
|
Short Cycling / Poor Heat Transfer | View Details |
| – |
The furnace starts with a loud boom or popping noise at ignition.
|
Delayed Ignition | View Details |
| – |
Visible yellow or orange, lazy flames instead of sharp blue flames (where the flame is visible).
|
Poor Combustion / Incomplete Burning | View Details |
No matching codes found
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