What does the Glow-worm Energy F70 fault code mean?
The F70 fault code on the Glow-worm Energy boiler indicates a central heating (CH) flow rate fault, which suggests that the flow of water through the heating system is insufficient. This can lead to inadequate heating performance and may require immediate attention to prevent further issues.
Common Causes
- Blocked Filter: A blockage in the system filter can restrict water flow, causing the F70 error.
- Pump Failure: If the circulating pump is malfunctioning or has failed, it may not be able to maintain the necessary flow rate.
Can I fix it myself? (DIY)
If you are comfortable with basic maintenance, check and clean the system filter to remove any blockages. However, for issues related to the pump or if you are unsure, it is strongly advised to call a Gas Safe Engineer to avoid any gas or electrical hazards.
Estimated Repair Cost (2026 UK Prices)
The estimated repair cost for addressing the F70 fault could range from £150 to £300, depending on whether a filter cleaning or pump replacement is required. A new pump can be quite costly, hence the higher end of the estimate.