What does the Vokera E091 fault code mean?

Your boiler has detected a buildup of debris or sludge in its main heating component, which is preventing it from heating your water efficiently.

How much does it cost to fix Vokera error code E091?

Typical repair cost for the Vokera E091 fault is £120-350 including labour.

Clean primary heat exchanger

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

Each noise points to a different fault.

Sludge build-up — needs flushing, not bleeding.

Safety-critical — turn off, read this.