BoilerFaultCodesYour boiler has detected a problem with its internal temperature sensors, meaning it cannot accurately measure how hot the water is and has stopped running for safety.
Book a Gas Safe engineer within 24–48 hours. Your boiler may be unsafe or could break down completely if left.
Technical description: Sensor fault
What causes this fault?
This fault occurs when the boiler's internal computer receives an illogical or broken signal from the temperature sensors that monitor water flow. The most common reason is that a sensor has suffered an electrical failure or the wiring connecting it to the main control board has become loose or damaged.
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 F011 — 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.