BoilerFaultCodesYour boiler has experienced an internal computer failure and has shut down for safety, meaning it will no longer provide heating or hot water.
Book a Gas Safe engineer within 24–48 hours. Your boiler may be unsafe or could break down completely if left.
Technical description: Lockout Burner Mains - Automatic PCB Fault (Replace PCB)
What causes this fault?
This fault occurs when the boiler's internal control center suffers a critical hardware failure or a short circuit on its circuitry. The most common reasons are electrical surges, general wear and tear of the components over time, or moisture ingress from a slow internal leak that has reached the sensitive electronic board.
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 PCB Fault — no call-out fees, no surprises.
Affiliate links — we may earn a commission at no extra cost to you.
Potterton Performa SL HE 9 2 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.