What does the Sime ALL 96 fault code mean?

Your boiler has detected an obstruction in the flue pipe that expels exhaust gases, so it has shut itself down to prevent carbon monoxide buildup.

How much does it cost to fix Sime error code ALL 96?

Typical repair cost for the Sime ALL 96 fault is £120-250 including labour.

Manufacturer manual

Lockout due to flue (exhaust) blockage

From this model's manual

Verified against the Sime Murelle Advanced He Combi installation & service manual, page 32.

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

Boiler cover options

A cover plan would handle faults like ALL 96: no call-out fees, no surprise bills.

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Six most common causes of dropping pressure.

Each noise points to a different fault.

Safety-critical — turn off, read this.