BoilerFaultCodesGlow-worm 07 Fault Code
The Glow-worm 07 fault code means: your boiler is struggling to accurately measure the temperature of your hot water due to a faulty internal sensor.. It appears on 5 Glow-worm models in our database.
Technical description: Domestic hot water NTC fault
What causes the Glow-worm 07 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.
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Glow-worm models that show the 07 fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Glow-worm 07 fault code information on this page is sourced and cross-checked against the official Glow-worm service / installation manuals for each affected model.
- Glow-worm 30ci Plus manual (PDF)
- Glow-worm EnergySaver Combi manual (PDF)
- Glow-worm Xtrafast 96 manual (PDF)
Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 7 July 2026