BoilerFaultCodesWorcester Bosch 1065 B Fault Code
Also written as 1065B — same fault.
The Worcester Bosch 1065 B fault code means: your boiler's internal water pressure sensor is not communicating properly with the control board, preventing the system from operating safely.. It appears on 3 Worcester Bosch models in our database.
Technical description: Pressure sensor defective or not connected – check pressure sensor connection as it may need replacing
What causes the Worcester Bosch 1065 B fault?
This fault occurs when the boiler's brain loses contact with the sensor that monitors water pressure, often due to a loose wire or a physical failure inside the sensor itself. Without this vital data, the boiler shuts down as a safety precaution because it cannot confirm there is enough water to operate without overheating.
Engineer required
This fault requires a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.
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Worcester Bosch models that show the 1065 B fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Worcester Bosch 1065 B fault code information on this page is sourced and cross-checked against the official Worcester Bosch service / installation manuals for each affected model.
Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 7 July 2026