BoilerFaultCodesYour boiler’s internal computer has encountered a critical error and needs a professional to reset or replace the main control board.
Book a Gas Safe engineer within 24–48 hours. Your boiler may be unsafe or could break down completely if left.
Technical description: Internal failure - electronic
What causes this fault?
This fault occurs when the boiler's main control board experiences a software crash or a hardware failure within its internal circuitry. It is often caused by a voltage spike in the electrical supply or simply due to components on the board wearing out over time. Because the 'brain' of the boiler can no longer safely monitor operations, it shuts the system down as a precaution.
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 410 — no call-out fees, no surprises.
Affiliate links — we may earn a commission at no extra cost to you.
Ideal Response SE is discontinued — time for a new one?
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.
Affiliate links — we may earn a commission at no extra cost to you.