BoilerFaultCodesBaxi 162 Fault Code
The Baxi 162 fault code means: your boiler has detected an issue with how it clears exhaust gases or brings in fresh air, preventing it from firing up for safety.. It appears on 5 Baxi models in our database.
Technical description: Air pressure switch error
What causes the Baxi 162 fault?
This fault occurs when the boiler's internal safety sensor detects that the fan isn't moving air through the system correctly, which is vital for clearing dangerous exhaust gases. The most common reasons are a blockage in the flue pipe, a split in the small rubber sensing tubes, or a mechanical failure within the air pressure switch itself.
This fault can be more frequent during periods of heavy rain or high winds, as debris can be blown into the flue or moisture can enter the sensing tubes.
Engineer required
This fault requires a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.
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Baxi models that show the 162 fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Baxi 162 fault code information on this page is sourced and cross-checked against the official Baxi service / installation manuals for each affected model.
Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 7 July 2026