What does the Worcester Bosch Greenstar i F59 fault code mean?
The F59 fault code indicates a problem with the system air, typically related to insufficient water pressure or air trapped in the system. This can prevent the boiler from operating efficiently and may lead to further issues if not addressed.
Common Causes
- Low Water Pressure: Insufficient water pressure can cause the boiler to detect air in the system, leading to the F59 fault code.
- Air Trapped in the System: If there is air trapped in the heating system, it can disrupt the flow of water, triggering the fault code.
Can I fix it myself? (DIY)
If you are comfortable, you can check the water pressure gauge on the boiler and refill the system if the pressure is low. However, if you suspect air is trapped, it is advisable to bleed the radiators or call a Gas Safe Engineer for assistance.
Estimated Repair Cost (2026 UK Prices)
The estimated repair cost for addressing the F59 fault code is around £150, which includes a service call and potential bleeding of radiators or pressure adjustment. This cost reflects the typical service fees for a Gas Safe Engineer in the UK.