What does the Sime AL 28 fault code mean?

Your boiler has been manually reset too many times in a short period and has temporarily locked itself for safety.

How much does it cost to fix Sime error code AL 28?

Typical repair cost for the Sime AL 28 fault is £100-£350 including labour.

Leave the boiler powered on but do not touch any buttons for at least 60 minutes.

Manufacturer manual

Maximum number of consecutive resets reached (6) — wait 1 hour; attempt reset again; contact Technical Assistance if unresolved

Shared across the range

This code is shared by the boilers in this range, which use the same control board. It may not be printed in this exact variant’s manual.

This is a high 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 AL 28: no call-out fees, no surprise bills.

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