What does the Glow-worm Betacom F81 fault code mean?
The F81 fault code indicates a domestic hot water (DHW) inlet pressure fault in the Glow-worm Betacom boiler. This typically means that the pressure of the water entering the boiler is either too low or too high, preventing the system from functioning correctly.
Common Causes
- Low Inlet Water Pressure: This can occur due to issues with the mains water supply or a blockage in the inlet pipe.
- Faulty Pressure Sensor: A malfunctioning pressure sensor may incorrectly read the inlet pressure, triggering the fault code.
Can I fix it myself? (DIY)
If you are comfortable, check the water pressure gauge on your boiler; it should typically be between 1-1.5 bar. If the pressure is low, you can top it up using the filling loop. However, for any gas or electrical issues, it is crucial to call a Gas Safe Engineer.
Estimated Repair Cost (2026 UK Prices)
The estimated repair cost for resolving an F81 fault could range from £100 to £200, depending on whether the issue is simply a pressure adjustment or if a faulty pressure sensor needs replacing, which can be more costly.