BoilerFaultCodesYour boiler has detected a problem with the sensor that monitors the temperature of the water leaving the unit to heat your radiators.
Book a Gas Safe engineer within 24–48 hours. Your boiler may be unsafe or could break down completely if left.
Technical description: Central heating flow NTC fault
What causes this fault?
This fault occurs when the internal sensor responsible for monitoring the heat of the water going to your radiators fails or sends an unreadable signal. The most common reason is that the sensor has physically degraded over time or a small leak has caused corrosion on the electrical connections. Without an accurate temperature reading, the boiler shuts down as a safety precaution to prevent overheating.
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 06 — no call-out fees, no surprises.
Affiliate links — we may earn a commission at no extra cost to you.
Glow-worm 30ci 30si 35ci 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.