BoilerFaultCodesWorcester Bosch E9276 Fault Code
The Worcester Bosch E9276 fault code means: your boiler has shut down because the water inside it has become dangerously hot.. It appears on 2 Worcester Bosch models in our database.
Technical description: Primary flow temperature exceeded 95°c
What causes the Worcester Bosch E9276 fault?
This fault occurs when the water inside the boiler cannot move away from the burner fast enough, causing it to reach a dangerously high temperature. The most common reasons are a failed internal pump that isn't pushing the water around, or a blockage caused by a build-up of sludge and debris in the system. When this heat spike is detected, the boiler shuts down immediately as a safety precaution to prevent internal damage.
This fault is more common in autumn when heating is turned on for the first time after summer, as pump components can seize during long periods of inactivity.
DIY fix possible
Check if your radiator valves are fully open to allow water to circulate.Ensure your system pressure is between 1 and 1.5 bar on the front gauge.Restart the boiler by holding the 'reset' button for five seconds once the system has cooled down.
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Gas Safe Register →Worcester Bosch models that show the E9276 fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Worcester Bosch E9276 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