What does the Glow-worm Ultimate F92 fault code mean?
The F92 fault code indicates a Domestic Hot Water (DHW) pressure alert, which signifies that the pressure in the system is either too low or too high. This can affect the boiler’s ability to provide hot water efficiently.
Common Causes
- Low Water Pressure: This can occur due to leaks in the system or insufficient water supply, leading to inadequate pressure for hot water production.
- High Water Pressure: Excessive pressure can result from a malfunctioning pressure relief valve or an issue with the expansion vessel, causing the boiler to trigger the fault code.
Can I fix it myself? (DIY)
If you are comfortable, you can check the pressure gauge on the boiler and attempt to adjust the pressure using the filling loop if it is low. However, if the pressure is too high or if you suspect a more serious issue, it is crucial to call a Gas Safe Engineer for assistance.
Estimated Repair Cost (2026 UK Prices)
The estimated repair cost for addressing the F92 fault could range from £150 to £300, depending on whether a pressure relief valve or expansion vessel needs replacement. This estimate includes parts and labour, reflecting the complexity of the repair.