BoilerFaultCodesYour boiler has detected a general internal fault that has caused it to stop working for safety, and it will only restart once the root cause is identified and cleared.
Book a Gas Safe engineer within 24–48 hours. Your boiler may be unsafe or could break down completely if left.
Technical description: General error code - deactivated when the causes are no longer present
What causes this fault?
This fault occurs when the boiler’s central brain detects an internal communication failure or an electrical conflict it cannot resolve. The most common cause is a failing main control board or damaged internal wiring that prevents the system from safely managing the heating process.
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 E — no call-out fees, no surprises.
Affiliate links — we may earn a commission at no extra cost to you.
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.
Affiliate links — we may earn a commission at no extra cost to you.