BoilerFaultCodesYour boiler's internal computer has encountered a software or communication glitch that is preventing it from running safely.
Book a Gas Safe engineer within 24–48 hours. Your boiler may be unsafe or could break down completely if left.
Technical description: Internal error.
What causes this fault?
This fault occurs when the boiler's main control board experiences a digital communication failure or a software crash. It is essentially a 'brain freeze' where the internal components can no longer talk to each other correctly, often caused by an electrical surge or a component failing on the circuit board.
DIY fix possible
Locate the reset button on the boiler control panel.Press and hold the reset button for five seconds.Wait for the boiler to restart; if the code returns, you must call a Gas Safe engineer.
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 F0 — no call-out fees, no surprises.
Affiliate links — we may earn a commission at no extra cost to you.
Worcester Bosch RD 532 Combi 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.