BoilerFaultCodesYour boiler is experiencing a communication error between its control system and the temperature sensors, meaning it cannot accurately monitor the water temperature.
Book a Gas Safe engineer within 24–48 hours. Your boiler may be unsafe or could break down completely if left.
Technical description: Without time delay
What causes this fault?
This fault occurs when the boiler's central brain loses contact with the sensors that monitor heat levels, often due to a broken internal wire or a sensor that has failed completely. Because the control system can no longer safely tell how hot the water is, it shuts down to prevent the system from overheating. It is usually caused by a physical break in the electrical circuit or moisture damage to the sensitive electronic connections.
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 80:0 — 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.