BoilerFaultCodesBritish Gas 5.0 Fault Code
Also written as 50 — same fault.
The British Gas 5.0 fault code means: your boiler is currently running at its maximum capacity to bring your home up to the desired temperature and is not actually reporting a fault.. It appears on 1 British Gas model in our database.
Technical description: Max. heating output
DIY fix possible
Check if your thermostat is set to a very high temperatureWait for the house to warm up to see if the code clears naturallyMonitor the boiler to ensure it eventually scales back its power output
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British Gas models that show the 5.0 fault code
Click a model for the full fault code list and model-specific repair notes.
Source
British Gas 5.0 fault code information on this page is sourced and cross-checked against the official British Gas service / installation manuals for each affected model.
Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 7 July 2026