How much does it cost to fix Worcester Bosch error code 2971 B?

Typical repair cost for the Worcester Bosch 2971 B fault is £0-180 including labour.

2971 B High

Worcester Bosch 2971 B Fault Code

Q: What does the Worcester Bosch 2971 B fault code mean?

Your boiler has detected that the water pressure in your heating system is too low to operate safely and effectively.

Also written as 2971B — same fault.

The Worcester Bosch 2971 B fault code means: your boiler has detected that the water pressure in your heating system is too low to operate safely and effectively.. It appears on 13 Worcester Bosch models in our database.

Technical description: System pressure too low – the heating system needs venting or water needs topping up until the preset pressure is reached. Replace the cable to the pressure sensor replace the pressure sensor

What causes the Worcester Bosch 2971 B fault?

This fault occurs when the internal sensor detects that there is not enough water inside the system to safely transfer heat. The most common cause is a slow leak in the pipework or radiators, though it frequently happens after you have recently bled your radiators to remove air. In some cases, the error persists because the pressure sensor itself has failed or the electrical connection to it has become loose.

This code is frequently seen in autumn when homeowners turn their heating back on for the first time or bleed their radiators to prepare for winter.

Typical repair cost £0-180 (including labour)

DIY fix possible

Check the pressure gauge on the front of the boiler; it will likely be in the red zone.Locate the filling link (either a built-in lever or a flexible silver hose) and slowly turn it to add water.Monitor the gauge and stop once it reaches between 1 and 1.5 bar, then ensure the filling link is fully closed.

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Worcester Bosch models that show the 2971 B fault code

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

Source

Worcester Bosch 2971 B 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