High
260 on Worcester Bosch 35 RSF

Your boiler has shut down because it cannot detect heat moving from the burner into your heating system, usually because water is not circulating properly.

Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed

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

Engineer required

This is a high severity fault. Stop using the boiler and call a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.

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