How much does it cost to fix Worcester Bosch error code 54?

Typical repair cost for the Worcester Bosch 54 fault is £120-350 including labour.

54 High

Worcester Bosch 54 Fault Code

Q: What does the Worcester Bosch 54 fault code mean?

Your boiler has reached an unsafe temperature and has shut itself down to prevent damage to the internal components.

The Worcester Bosch 54 fault code means: your boiler has reached an unsafe temperature and has shut itself down to prevent damage to the internal components.. It appears on 1 Worcester Bosch model in our database.

Technical description: Overheating

What causes the Worcester Bosch 54 fault?

This fault occurs when water cannot circulate through the boiler quickly enough to carry heat away, causing the internal temperature to spike. The most common reasons are a failed pump that isn't pushing water, a blockage caused by sludge buildup, or air trapped within the system.

This issue is more frequent when heating is first turned on after summer, as the pump can seize up during long periods of inactivity.

Typical repair cost £120-350 (including labour)

DIY fix possible

Check if any radiator valves have been accidentally closed and open them fullyEnsure your system pressure is between 1 and 1.5 bar on the pressure gaugeGently bleed your radiators to remove any trapped air that might be blocking water flow

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Worcester Bosch models that show the 54 fault code

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

WR325 RSF Repair: £120-350

Source

Worcester Bosch 54 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