Baxi Duo-tec Combi

This error code indicates an issue with the gas valve connection cable. The boiler's display will show the spanner symbol and the numeric error code, suggesting an internal component problem.

This error code signifies a fault within the gas valve component of the boiler. The boiler's display will show the spanner symbol and the numeric error code, indicating an internal issue.

This error code indicates a problem with the Central Heating NTC (Negative Temperature Coefficient) sensor. The boiler's display will show the spanner symbol and the numeric error code, suggesting a sensor malfunction.

This error code indicates a problem with the Flue NTC (Negative Temperature Coefficient) sensor. The boiler's display will show the spanner symbol and the numeric error code, suggesting a sensor malfunction.

This error code indicates a problem with the Central Heating Return NTC (Negative Temperature Coefficient) sensor. The boiler's display will show the spanner symbol and the numeric error code, suggesting a sensor malfunction.

This error code indicates that the boiler requires a calibration process. The boiler's display will show the spanner symbol and the numeric error code, signifying that system adjustments are needed.

This error code indicates a problem with the pre-circulation phase of the boiler's operation. The boiler's display will show the spanner symbol and the numeric error code, suggesting an issue with water flow.

This error code indicates that a safety thermostat has operated, likely due to the boiler overheating. The boiler's display will show the spanner symbol and the numeric error code, signifying a safety shutdown.

The boiler has detected that the primary system water pressure has exceeded 3 bar, which has caused the safety pressure valve to activate. This prevents damage to the heating system.

The central heating system pressure is too low, indicated by the gauge reading below 1 bar or the E118 error code on the display. The boiler will not operate correctly until the pressure is restored.

This error code indicates a problem with the primary circulation of water within the boiler or heating system. The boiler's display will show the spanner symbol and the numeric error code.

This error code indicates that the boiler's flame has failed to ignite or has extinguished during operation. The boiler's display will show the spanner symbol and the numeric error code, preventing normal heating.

This error code indicates that the flue NTC sensor has been activated, likely due to high flue gas temperatures. The boiler's display will show the spanner symbol and the numeric error code, signifying a safety shutdown.

This error code signifies an interruption in the gas supply to the boiler or a failure of the flame to ignite. The boiler's display will show the spanner symbol and the numeric error code.

This error code indicates that the gas valve is open, but the boiler is not detecting any gas flow or ignition. The boiler's display will show the spanner symbol and the numeric error code, preventing ignition.

This error code indicates an internal interruption in the boiler's gas supply system. The boiler's display will show the spanner symbol and the numeric error code, signifying an internal fault.

This error code indicates a failure in the boiler's self-test for the flow and return temperature sensors. The boiler's display will show the spanner symbol and the numeric error code, suggesting a sensor or water flow issue.

This error code indicates a problem with the boiler's fan or its associated wiring. The boiler's display will show the spanner symbol and the numeric error code, preventing safe operation.

This error code indicates a serious circulation fault, often referred to as 'dry fire', where the boiler attempts to fire without adequate water circulation. The display will show the spanner symbol and the numeric error code.

This error code indicates a problem with the Hot Water NTC (Negative Temperature Coefficient) sensor, which monitors the domestic hot water temperature. The boiler's display will show the spanner symbol and the numeric error code.

This error code indicates that the boiler's flame detection system is detecting a flame when none should be present, or at an inappropriate time. The boiler's display will show the spanner symbol and the numeric error code.

The 'E' (Error) symbol is illuminated or flashing on the boiler display, indicating a general fault that is preventing the burner from starting. This is often accompanied by a specific numeric error code.

This code indicates a fault with the Central Heating NTC (Negative Temperature Coefficient) sensor, which measures the heating water temperature. The boiler display will show 'E' alternating with '20'. This usually means the sensor itself or its wiring is defective.

This code indicates a fault with the Flue NTC (Negative Temperature Coefficient) sensor, which monitors the temperature of the exhaust gases. The boiler display will show 'E' alternating with '28'. This suggests a problem with the sensor or its connection.

This code indicates a fault with the Hot Water NTC (Negative Temperature Coefficient) sensor, which measures the domestic hot water temperature. The boiler display will show 'E' alternating with '50'. This usually means the sensor or its wiring is defective, affecting hot water production.

This code signifies that the primary water in the boiler has exceeded safe operating temperatures, causing an overheat safety lockout. The display shows 'E1' alternating with '10'.

This code indicates that the primary central heating system water pressure is too low, below 0.5 bar. The display shows 'E1' alternating with '19'. The boiler will not operate safely until the pressure is topped up.

This code indicates a problem with the boiler's internal water circulation. It can appear if the boiler temperature doesn't change enough after ignition or if it overheats rapidly despite modulating, suggesting poor flow. The display shows 'E1' alternating with '25'.

This code indicates that the flue system has reached an excessively high temperature, triggering a safety shutdown. The display shows 'E1' alternating with '30'. This can be caused by restricted exhaust flow.

This code signifies that the boiler has failed to ignite or detect a flame, or the gas supply has been interrupted. The display shows 'E1' alternating with '33'. This will prevent the boiler from producing heat or hot water.

This code indicates a problem with the boiler's internal fan or its electrical wiring. The display shows 'E1' alternating with '60'. The fan is essential for drawing in air for combustion and expelling flue gases safely.

This code indicates an issue detected during the boiler's initial pre-circulation phase. The display shows 'E1' alternating with '93'. This means the boiler is unable to establish proper water flow before ignition.

The boiler is not operating and other gas appliances in the property (e.g., cooker or gas fire) are also not working, indicating a potential interruption to the gas supply.

The boiler display is unlit, and the boiler is not working, suggesting a complete lack of electrical supply. This prevents the boiler from operating and any error codes from being shown.

The boiler is not producing heat because the room thermostat (if fitted) is set to a temperature lower than the current room temperature, so it is not calling for heat. The boiler is correctly waiting for a heat demand.

The boiler display shows 'Sd' alternating with the boiler temperature, indicating that an annual service is due. This message appears after approximately 11 months of operation.

This display indicates that the boiler has entered 'Calibration Mode', which is used by engineers for specific setup and testing (e.g., setting gas rates or CO2 levels). 'SF' will alternate with the current boiler temperature, and both green LEDs will flash. This is an operational status, not a fault.

The spanner symbol is illuminated or flashing on the boiler display, indicating a fault that typically cannot be reset by the user and requires professional attention. Specific error codes will usually be displayed alongside this symbol.

The boiler is not producing heat because the external timer (if fitted) is not set to 'ON' or configured to call for central heating at the current time. The boiler will wait for a demand signal.