BoilerFaultCodesYour boiler's main internal computer has stopped working correctly and cannot control the heating process.
Book a Gas Safe engineer within 24–48 hours. Your boiler may be unsafe or could break down completely if left.
Technical description: Control box failure
What causes this fault?
This fault occurs when the boiler's internal computer chips or electrical circuits suffer a terminal failure, often due to age, overheating, or moisture ingress. Over time, the solder joints and components on the circuit board can degrade, making it impossible for the system to process signals or safely manage the burner.
This failure is more common during the autumn months when the boiler is switched back on after a summer of inactivity, as electrical components can fail under the sudden stress of constant use.
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 Other Codes — no call-out fees, no surprises.
Affiliate links — we may earn a commission at no extra cost to you.
Remeha Quinta 30 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.