504
FAULT CODE
Ariston
Flame Lift
High Severity
Engineer Required
The boiler has detected 'flame lift' — the flame has lifted away from the burner surface, causing unstable combustion.
Step-by-Step Fix Guide
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Step 1 Engineer only
Call a Gas Safe engineer — this requires a combustion analysis and may indicate incorrect gas/air ratio settings
Gas Safe Reminder
Work on gas appliances must be carried out by a Gas Safe registered engineer. The steps above cover safe checks a homeowner can perform - any internal component replacement requires a qualified professional. If in doubt, always call an engineer.