260 High

Worcester Bosch 260 Fault Code

The Worcester Bosch 260 fault code means: your boiler has started up but cannot detect the water getting any hotter, so it has shut down to prevent overheating.. It appears on 11 Worcester Bosch models in our database.

Call an engineer soon

Book a Gas Safe engineer within 24 to 48 hours. Your boiler may be unsafe or could break down completely if left.

Technical description: The flow temperature sensor is not detecting a rise in temperature following a burner start

What causes the Worcester Bosch 260 fault?

This fault occurs when the boiler fires up but the internal sensors don't see the water temperature increasing as expected. The most common reason is that water isn't moving through the system quickly enough, often due to a seized pump or a blockage in the heat exchanger. Because the heat has nowhere to go, the boiler shuts down immediately to protect its internal components from overheating.

This issue often surfaces in autumn when the heating is turned back on after a long summer break, as pump components can seize up during periods of inactivity.

Typical repair cost £120-£350 (including labour)

DIY fix possible

Check that your central heating valves under the boiler are fully openEnsure all your radiator valves (TRVs) are turned to a high settingCheck your system pressure is between 1 and 1.5 bar and top up if necessaryBleed your radiators to remove any trapped air pockets

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Worcester Bosch models that show the 260 fault code

Click a model for the full fault code list and model-specific repair notes.

Source

Worcester Bosch 260 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