BoilerFaultCodesWorcester Bosch 2970 Fault Code
The Worcester Bosch 2970 fault code means: your boiler has detected that the water pressure in your heating system is falling much faster than normal, which usually indicates a significant leak or a fault with the pressure sensor.. It appears on 4 Worcester Bosch models in our database.
Technical description: Pressure drop in heating system too rapid
What causes the Worcester Bosch 2970 fault?
This fault occurs when the boiler's internal sensor detects a sudden and significant loss of water pressure within a short timeframe. The most common reason is a major leak in your radiators or pipework, though it can also be triggered by a failing component inside the boiler that is incorrectly reading the pressure levels.
This fault is more common in autumn when homeowners first turn their central heating back on after summer, as the change in temperature and pressure can expose weak seals or pinhole leaks.
DIY fix possible
Check all visible radiators and pipes for signs of water leaksTop up the system pressure using the internal filling link to between 1 and 1.5 barMonitor the pressure gauge to see if it drops rapidly again after refilling
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Gas Safe Register →Worcester Bosch models that show the 2970 fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Worcester Bosch 2970 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