BoilerFaultCodesYour boiler's computer screen and main control board are having trouble communicating with each other.
Book a Gas Safe engineer within 24–48 hours. Your boiler may be unsafe or could break down completely if left.
Technical description: Alternative control (automatic adjustment upon recognition of the operating interface)
What causes this fault?
This fault occurs when the boiler's internal computer brain loses its connection with the display screen on the front of the unit. The most common reason is a loose or damaged data cable connecting the two parts, or an electronic failure within the display module itself. Because the components can no longer 'talk' to each other, the boiler stops working as a safety 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 50:0 — 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.