What does the Worcester Bosch Greenstar i F22 fault code mean?
The F22 fault code on the Worcester Bosch Greenstar i indicates a dry fire condition or low water pressure in the system. This typically means that the boiler is unable to operate safely due to insufficient water levels.
Common Causes
- Low Water Pressure: This can occur due to leaks in the system or insufficient water being added to the boiler.
- Air Locks: Air trapped in the system can prevent water from circulating properly, leading to low pressure.
Can I fix it myself? (DIY)
You can attempt to fix the low pressure by checking the pressure gauge on the boiler and using the filling loop to add water if necessary. However, if you suspect any gas or electrical issues, it is crucial to call a Gas Safe Engineer.
Estimated Repair Cost (2026 UK Prices)
The estimated cost for addressing the F22 fault, particularly if it involves refilling the system or fixing minor leaks, is around £100-£150. This includes the cost of a service call and any necessary minor repairs.