What does the Glow-worm Flexicom F90 fault code mean?
The F90 fault code on a Glow-worm Flexicom boiler indicates that the performance checks have failed, which can affect the boiler’s efficiency and operation. This fault typically suggests an issue with the boiler’s internal components or sensors that monitor its performance.
Common Causes
- Faulty Sensor: A malfunctioning temperature or pressure sensor can lead to incorrect readings, triggering the F90 fault code.
- Internal Component Failure: Issues with internal components such as the heat exchanger or control board may cause performance checks to fail.
Can I fix it myself? (DIY)
It is highly recommended to call a qualified Gas Safe Engineer to diagnose and repair the F90 fault, as it involves complex internal components and safety risks associated with gas appliances.
Estimated Repair Cost (2026 UK Prices)
The estimated repair cost for resolving the F90 fault could range from £150 to £300, depending on whether a sensor replacement or more extensive repairs to internal components are necessary.