What does the Worcester Bosch Greenstar i F57 fault code mean?
The F57 fault code indicates a problem with the system return, which can affect the boiler’s ability to operate efficiently. This issue may lead to overheating or inadequate heating in the system.
Common Causes
- Blocked Return Pipe: A blockage in the return pipe can prevent proper water flow, causing the fault code to trigger.
- Faulty Temperature Sensor: A malfunctioning temperature sensor may incorrectly read the system return temperature, leading to the F57 error.
Can I fix it myself? (DIY)
It is advisable to call a Gas Safe Engineer to diagnose and repair this issue, as it may involve gas or electrical components that require professional handling.
Estimated Repair Cost (2026 UK Prices)
The estimated repair cost for resolving the F57 fault could be around £150 to £250, depending on whether a blockage is cleared or a sensor is replaced, as parts and labour can vary significantly.