What does the Glow-worm Ultimate F83 fault code mean?
The F83 fault code on the Glow-worm Ultimate indicates a domestic hot water (DHW) pressure issue, which typically means that the system is unable to maintain the required pressure for hot water delivery. This can lead to insufficient hot water supply or system shutdown.
Common Causes
- Low Water Pressure: The pressure in the system may have dropped below the minimum required level, often due to leaks or insufficient filling.
- Faulty Pressure Sensor: A malfunctioning pressure sensor can incorrectly report pressure levels, leading to the F83 fault code being triggered.
Can I fix it myself? (DIY)
If you are comfortable with basic plumbing, you can check the pressure gauge on the boiler and top up the system pressure if it is low. However, if the issue persists or involves gas or electrical components, it is essential to call a Gas Safe Engineer for safety reasons.
Estimated Repair Cost (2026 UK Prices)
The estimated repair cost for resolving the F83 fault could range around £150 to £250, primarily depending on whether a pressure sensor needs replacement or if additional repairs are required to address leaks or other underlying issues.