7 flashes High

Worcester Bosch 7 flashes Fault Code

Also written as 7FLASHES — same fault.

The Worcester Bosch 7 flashes fault code means: your boiler has overheated because the water inside is not moving correctly or has become too hot, causing a safety sensor to shut the system down.. It appears on 3 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: Safety temp. limiter in CH flow has tripped. Check system pressure, check safety temp. limiters, check pump operation, check fuse on pcb, bleed appliance.
Typical repair cost £100-£280 (including labour)

DIY fix possible

Check the pressure gauge is between 1.0 and 1.5 barBleed all radiators to remove trapped airEnsure at least two radiator valves are fully open to allow water flowReset the boiler using the reset button

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Worcester Bosch models that show the 7 flashes fault code

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

Source

Worcester Bosch 7 flashes 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