What does the Glow-worm Flexicom F89 fault code mean?
The F89 fault code on the Glow-worm Flexicom indicates that the boiler has detected a failure during its operational checks. This typically suggests an issue with the boiler’s internal components or sensors that monitor its performance.
Common Causes
- Faulty Sensors: Malfunctioning temperature or pressure sensors can lead to incorrect readings, triggering the F89 fault code.
- Electrical Issues: Problems with wiring or connections within the boiler can disrupt its operational checks, resulting in this fault code.
Can I fix it myself? (DIY)
It is strongly advised to call a Gas Safe Engineer for any issues related to gas or electrical components. Attempting to fix these problems without proper training can be dangerous.
Estimated Repair Cost (2026 UK Prices)
The estimated repair cost for resolving the F89 fault code is around £150 to £250, depending on whether a sensor replacement or electrical repair is needed. This cost reflects the complexity of diagnosing and fixing internal boiler issues.