What does the Glow-worm Betacom F90 fault code mean?
The F90 fault code indicates a problem with the central heating inlet temperature sensor in the Glow-worm Betacom boiler. This sensor is crucial for monitoring the temperature of the water entering the heating system, and a fault can disrupt the boiler’s operation.
Common Causes
- Faulty Temperature Sensor: The sensor may be defective or damaged, leading to inaccurate readings.
- Wiring Issues: Damaged or loose wiring connections to the sensor can cause communication failures between the sensor and the boiler control board.
Can I fix it myself? (DIY)
It is recommended to call a Gas Safe Engineer to diagnose and repair this issue, as it involves electrical components and safety risks. Attempting to fix it yourself could lead to further damage or safety hazards.
Estimated Repair Cost (2026 UK Prices)
The estimated repair cost for replacing the central heating inlet temperature sensor is around £120-£150. This includes the cost of the part and labour, as sensor replacement typically requires professional expertise.