What does the Vaillant ecoFIT pure F27 fault code mean?
The F27 fault code on the Vaillant ecoFIT pure indicates a problem with the flow sensor, which is responsible for measuring the flow of water through the heating system. This issue can lead to inadequate heating and hot water supply, requiring attention to restore proper function.
Common Causes
- Blocked Flow Sensor: Debris or limescale buildup can obstruct the flow sensor, preventing it from accurately measuring water flow.
- Electrical Fault: A malfunction in the wiring or connections related to the flow sensor can cause it to fail, leading to the F27 error code.
Can I fix it myself? (DIY)
It is advisable to call a qualified Gas Safe Engineer to diagnose and repair the fault, as working with gas appliances can be dangerous and requires professional expertise.
Estimated Repair Cost (2026 UK Prices)
The estimated repair cost for addressing the F27 fault code is around £150 to £250, which includes the replacement of the flow sensor and associated labour. This cost reflects the complexity of the repair and the need for a qualified technician.