BoilerFaultCodesWorcester Bosch 1019 Fault Code
The Worcester Bosch 1019 fault code means: your boiler's computer cannot communicate properly with the internal pump, usually because it doesn't recognize the specific model or there is a software mismatch.. It appears on 8 Worcester Bosch models in our database.
Technical description: Incorrect pump type detected
What causes the Worcester Bosch 1019 fault?
This fault happens when the boiler's main control board loses its digital connection with the internal water pump. The most common reason is that the pump's internal electronics have failed or the wiring between the pump and the main computer has become loose or damaged. Without this constant digital 'handshake,' the boiler stops for safety because it cannot confirm that water is being moved around your system correctly.
Engineer required
This fault requires a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.
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Gas Safe Register →Worcester Bosch models that show the 1019 fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Worcester Bosch 1019 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 27 April 2026