BoilerFaultCodesYour boiler has lost track of the water temperature and has shut down as a safety precaution.
Book a Gas Safe engineer within 24–48 hours. Your boiler may be unsafe or could break down completely if left.
Technical description: Fault on Temperature Sensor
What causes this fault?
This fault occurs when the boiler's main control board stops receiving a consistent or accurate signal from the internal temperature sensor. The most common reason is that the sensor has physically failed or developed a short circuit, meaning the boiler can no longer safely monitor how hot the water is. In some cases, loose or damaged wiring between the sensor and the brain of the boiler can also trigger this shutdown.
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 Neon8 — no call-out fees, no surprises.
Affiliate links — we may earn a commission at no extra cost to you.
Potterton Performa System HE 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.