BoilerFaultCodesWorcester Bosch 2972 Fault Code
The Worcester Bosch 2972 fault code means: your boiler has detected that the electricity supply coming from your home's mains or the local grid is too low for it to operate safely.. It appears on 7 Worcester Bosch models in our database.
Technical description: Mains voltage too low
What causes the Worcester Bosch 2972 fault?
This fault occurs when the electrical supply entering the boiler drops below the minimum threshold required for the internal components to function. It is usually triggered by a temporary dip in the local power grid, though it can also be caused by loose internal wiring or a failing electronic control board within the unit.
This issue is more frequent during winter or periods of extreme weather when the local electrical grid is under heavy load or damaged by storms.
Engineer required
This fault requires a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.
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Gas Safe Register →Worcester Bosch models that show the 2972 fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Worcester Bosch 2972 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