What does the Vaillant ecoTEC plus F45 fault code mean?
The F45 fault code on the Vaillant ecoTEC plus indicates a malfunction of the diverter valve, which is responsible for directing hot water to either the heating system or the hot water supply. This issue can lead to inadequate heating or hot water supply, affecting the overall performance of the boiler.
Common Causes
- Blockage in the Diverter Valve: Debris or limescale build-up can obstruct the diverter valve, preventing it from functioning correctly.
- Electrical Fault: A failure in the electrical components or wiring connected to the diverter valve can lead to improper operation or complete failure.
Can I fix it myself? (DIY)
It is recommended to call a Gas Safe Engineer for this issue, as working on gas appliances can be dangerous and requires professional expertise. Attempting to fix the diverter valve without proper training may lead to further complications.
Estimated Repair Cost (2026 UK Prices)
The estimated repair cost for a faulty diverter valve on a Vaillant ecoTEC plus is approximately £250 to £350. This includes the cost of the replacement part and labour, reflecting the complexity of the repair and the need for a qualified technician.