BoilerFaultCodesWorcester Bosch 72 Fault Code
The Worcester Bosch 72 fault code means: wind or air is blowing back down your boiler's chimney, which is preventing the exhaust fumes from escaping safely.. It appears on 2 Worcester Bosch models in our database.
Technical description: Downdraught
What causes the Worcester Bosch 72 fault?
This fault occurs when strong gusts of wind enter the flue pipe and push air back into the boiler, disrupting the internal pressure balance. The most common reason is that the flue terminal is positioned in an area exposed to high winds or is missing a protective guard, causing the safety sensors to trigger a shutdown to prevent fumes from entering the home.
This fault is much more frequent during autumn and winter months when high winds and stormy weather conditions are prevalent.
Engineer required
This fault requires a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.
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Worcester Bosch models that show the 72 fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Worcester Bosch 72 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 7 July 2026