High
Lock-out signal lamp red on Biasi Garda M90f

Your boiler is failing to detect a flame correctly during startup, causing it to stop for safety until you manually reset it.

Call an engineer soon

Book a Gas Safe engineer within 24 to 48 hours. Your boiler may be unsafe or could break down completely if left.

Technical description

The boiler starts the ignition cycle. By pressing the reset-push-button the boiler turns on and operates correctly

Engineer required

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

Find a Gas Safe engineer
Search the official register →

Related guides you might find useful