BoilerFaultCodesYour boiler is struggling to accurately measure the temperature of your hot water due to a faulty internal sensor.
This fault should be looked at by a Gas Safe engineer within the next week or two. It may get worse if left.
Technical description: Domestic hot water NTC fault
What causes this fault?
This fault occurs when the sensor responsible for monitoring your hot water temperature has failed or is sending incorrect electrical signals to the main control board. Over time, these sensors can degrade due to constant heat cycles or internal corrosion, meaning the boiler can no longer safely tell how hot the water is. In some cases, the issue may simply be a loose or damaged wire connecting the sensor to the boiler's internal 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 07 — no call-out fees, no surprises.
Affiliate links — we may earn a commission at no extra cost to you.
Glow-worm 30ci Plus 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.