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

Typical repair cost for the Worcester Bosch Boiling fault is £150-300 including labour.

Boiling High

Worcester Bosch Boiling Fault Code

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

Your boiler is overheating because it cannot move the hot water away from the heating unit quickly enough, or it is struggling to accurately read its own temperature.

Also written as BOILING — same fault.

The Worcester Bosch Boiling fault code means: your boiler is overheating because it cannot move the hot water away from the heating unit quickly enough, or it is struggling to accurately read its own temperature.. It appears on 7 Worcester Bosch models in our database.

Technical description: Faulty boiler thermostat; Short circuit boiler thermostat; Thermostat bulb not fully home in pocket; No primary water circulation

Typical repair cost £150-300 (including labour)

Engineer required

This fault requires a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.

Find a Gas Safe engineer

Search the official register for a qualified engineer in your area.

Gas Safe Register →

Worcester Bosch models that show the Boiling fault code

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

Source

Worcester Bosch Boiling 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