Baxi LUNA DUO-TEC Boilers

The boiler display shows error code 09, indicating a problem with the connection to the gas valve. This prevents the boiler from operating correctly as it cannot control the gas supply.

Error code 10 indicates an issue with the outdoor temperature sensor. This sensor provides important data for the boiler's operation, and a fault can affect heating efficiency and control.

The boiler displays error code 15, signifying a problem with the command signal sent to the gas valve. This means the boiler is unable to properly control the gas flow.

Error code 20 points to a problem with the Central Heating NTC (Negative Temperature Coefficient) supply sensor. This sensor is crucial for measuring the heating system's water temperature.

Error code 28 indicates a fault with the Flue NTC (Negative Temperature Coefficient) heat exchanger sensor. This sensor monitors the temperature within the flue system.

The boiler displays error code 55, indicating that the PCB (Printed Circuit Board) has not been programmed. This usually happens after a new PCB installation or if the memory stick is not correctly connected.

A range of error codes from 83 to 87 signifies a communication issue between the boiler's main board and the external control unit (like a Baxi modulating room unit). This prevents the boiler and control from interacting correctly.

Error code 109 indicates a temporary fault related to the pre-circulation of water in the system. This can be caused by issues with the pump, restrictions in the system, or air.

This message appears on the boiler display immediately after a new PCB (Printed Circuit Board) has been installed. It indicates that the board needs to be configured with the correct settings for your boiler's gas type and hydraulic system.