What does the Viessmann 30:0 fault code mean?

Your boiler has detected an issue with the water pump that moves heat around your radiators and taps, meaning it cannot circulate heat effectively.

How much does it cost to fix Viessmann error code 30:0?

Typical repair cost for the Viessmann 30:0 fault is £250-450 including labour.

Internal non-variable speed circulation pump (automatic adjustment)

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

Sludge build-up — needs flushing, not bleeding.

Each noise points to a different fault.

Safety-critical — turn off, read this.