BoilerFaultCodesYour boiler has experienced a safety lockout and has shut itself down to prevent damage.
Book a Gas Safe engineer within 24–48 hours. Your boiler may be unsafe or could break down completely if left.
Technical description: Internal fault (locked-out)
What causes this fault?
This fault occurs when the boiler’s control board detects a safety issue or a failure to ignite, leading it to shut down the system for protection. The most common reasons include a worn ignition electrode that can no longer spark correctly or an internal electrical failure within the main circuit board. In some cases, a faulty sensor may be sending incorrect temperature readings, causing the boiler to trip its safety limit.
DIY fix possible
Locate the mode selector switch on the front panel.Turn the switch to the 'OFF/RESET' position and wait for 5-10 seconds.Turn the switch back to either 'Hot Water Only' or 'Heating & Hot Water' and wait for the boiler to restart.
Find a Gas Safe engineer
Search the official register for a qualified engineer in your area.
Gas Safe Register →Protect yourself from future repair bills
A boiler cover plan would cover faults like Green LED Off, Red LED On — 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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