BoilerFaultCodesBritish Gas 80 Fault Code
The British Gas 80 fault code means: your boiler has detected that the water temperature is too high, causing it to shut down to prevent damage or overheating.. It appears on 1 British Gas model in our database.
Technical description: Heat output: 21.9 kW | Heat input: 22.2 kW | Gas vol. flow rate: 38.8 (l/min at tV/tR = 80/60°C)
DIY fix possible
Check that all radiator valves are fully openEnsure the boiler pressure is between 1.0 and 1.5 barSwitch the boiler off and back on again to attempt a reset
Find a Gas Safe engineer
Search the official register for a qualified engineer in your area.
Gas Safe Register →Avoid the next call-out bill
A cover plan would handle faults like 80: no call-out fees, no surprise bills.
Affiliate links. We may earn a commission at no extra cost to you.
British Gas models that show the 80 fault code
Click a model for the full fault code list and model-specific repair notes.
Source
British Gas 80 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