What does the Glow-worm Ultimate F47 fault code mean?
The F47 fault code indicates a domestic hot water (DHW) pressure fault in the Glow-worm Ultimate boiler. This typically means that the system is unable to maintain the required pressure for hot water delivery, which can affect performance and efficiency.
Common Causes
- Low Water Pressure: Insufficient water pressure in the system can trigger this fault, often due to leaks or insufficient filling.
- Faulty Pressure Sensor: A malfunctioning pressure sensor may incorrectly report pressure levels, leading to the F47 code being displayed.
Can I fix it myself? (DIY)
If you are comfortable, you can check the boiler’s pressure gauge and attempt to refill the system if the pressure is low. However, if the issue persists or involves gas or electrical components, it is crucial to call a Gas Safe Engineer for safety reasons.
Estimated Repair Cost (2026 UK Prices)
The estimated repair cost for addressing the F47 fault could be around £150 to £250, depending on whether the issue is simply a refill or requires replacing a faulty pressure sensor. This cost reflects the typical labour and parts needed for such repairs.