BoilerFaultCodesYour boiler has detected an internal electronic error or a communication failure that requires a manual reset or professional diagnostic check.
Book a Gas Safe engineer within 24–48 hours. Your boiler may be unsafe or could break down completely if left.
Technical description: Final fault code (Refer to section 7.11)
What causes this fault?
This fault occurs when the boiler's internal computer suffers a critical communication failure or a software glitch. It is usually caused by the main control board failing to send or receive signals correctly, or by a loose connection in the wiring harness that links the electronic components together.
DIY fix possible
Turn the mode selector switch to the 'OFF/RESET' position.Wait approximately 10 seconds.Turn the switch back to either 'Hot Water Only' or 'Heating and Hot Water'.If the code persists after three reset attempts, call a Gas Safe engineer.
Find a Gas Safe engineer
Search the official register for a qualified engineer in your area.
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A boiler cover plan would cover faults like 08 — no call-out fees, no surprises.
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Parts for discontinued models can be hard to find and expensive. A new A-rated boiler could save you money on both repairs and energy bills.
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