What does the Vaillant F.35 fault code mean?

Your boiler is having trouble breathing because there may be a blockage, damage, or an obstruction in the pipework that vents exhaust gases outside.

How much does it cost to fix Vaillant error code F.35?

Typical repair cost for the Vaillant F.35 fault is £150-350 including labour.

Fault:Air/fluegasduct Checktheentireair/fluepipefor: – Permitteddesign – Restrictionorblockageintheair/fluepipecausedbyobstructions – Damage

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

Six most common causes of dropping pressure.

Each noise points to a different fault.

7 signs repair isn't worth it anymore.