BoilerFaultCodesWorcester Bosch 2971 Fault Code
The Worcester Bosch 2971 fault code means: your boiler has detected that the water pressure in the system has dropped below the minimum level required to operate safely.. It appears on 8 Worcester Bosch models in our database.
Technical description: System pressure too low
What causes the Worcester Bosch 2971 fault?
This fault occurs when the water pressure inside your heating system drops below 0.5 bar, which is too low for the boiler to safely heat your home. The most common reasons are a leak somewhere in your pipework or radiators, or because the system was recently bled and hasn't been topped back up with water.
This issue is more common in autumn when homeowners turn their heating back on for the first time and discover pressure has naturally seeped out over the summer months.
DIY fix possible
Locate the integrated filling link handle underneath the boiler (on some models) or the external braided filling loop.Slowly pull the lever or open the valves to allow water into the system while watching the digital display or pressure gauge.Close the valves firmly once the pressure reaches 1.5 bar and the fault code disappears.
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Gas Safe Register →Worcester Bosch models that show the 2971 fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Worcester Bosch 2971 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