Your boiler has encountered a technical internal error specifically relating to its main electronic control board which is preventing it from running.
Book a Gas Safe engineer within 24–48 hours. Your boiler may be unsafe or could break down completely if left.
Technical description: Multi-occupancy house
What causes this fault?
This fault occurs when the boiler's internal computer module fails to communicate correctly with the rest of the heating system. It is usually caused by an electrical component failure on the main circuit board or a corruption in the boiler's specific software settings. Hardware wear and tear or a power surge can often trigger this total system shutdown.
Engineer required
This fault requires a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.
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 7F:0 — no call-out fees, no surprises.
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Could it be time for a new boiler?
If repair costs are adding up, a new energy-efficient boiler could be the smarter long-term choice.
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