BoilerFaultCodesGlow-worm F07 Fault Code
The Glow-worm F07 fault code means: your boiler's hot water sensor has developed a fault, meaning it cannot accurately measure the temperature of the water coming out of your taps.. It appears on 1 Glow-worm model in our database.
Technical description: Domestic hot water NTC fault
What causes the Glow-worm F07 fault?
This fault occurs when the sensor responsible for monitoring your tap water temperature fails or begins sending incorrect electrical signals to the main control board. The most common reason is natural wear and tear or internal corrosion of the sensor's probe, which prevents the boiler from knowing how hot the water is. In some cases, the error can also be triggered by loose or damaged wiring connecting 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 →Glow-worm models that show the F07 fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Glow-worm F07 fault code information on this page is sourced and cross-checked against the official Glow-worm service / installation manuals for each affected model.
Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 27 April 2026