Baxi Duo-tec Combi ErP Boilers

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.

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 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.