What does the Vaillant F.64 fault code mean?

Your boiler has detected an internal electrical glitch or a faulty sensor reading, which has caused it to stop working to avoid potential damage.

How much does it cost to fix Vaillant error code F.64?

Typical repair cost for the Vaillant F.64 fault is £150-350 including labour.

Sensor or electronics fault | Check NTC's/connections or electronics defect

This is a high severity fault. Stop using the boiler and call a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.

7 signs repair isn't worth it anymore.

Break-even maths on monthly cover.

Realistic UK prices for a swap.