BoilerFaultCodesYour boiler has detected a problem with the sensor that monitors exhaust gases 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: Flue temperature probe fault
What causes this fault?
This fault occurs when the internal sensor responsible for monitoring the temperature of the exhaust gases sends an incorrect or missing signal to the main control board. It is usually caused by the sensor itself failing due to wear and tear, or a loose electrical connection in the wiring that links the sensor to the boiler's computer.
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 LED1 and LED2 on, LED3 flashing — no call-out fees, no surprises.
Affiliate links — we may earn a commission at no extra cost to you.
Ideal Mini 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.