A20
FAULT CODE
Ferroli
Condensate Siphon Blocked
Medium Severity
Engineer Required
The internal condensate siphon is blocked with scale, debris, or ice.
Cold Weather Note
Check external condensate pipe for freezing before assuming the internal siphon is blocked.
Step-by-Step Fix Guide
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Step 1
In cold weather, first check if the external condensate pipe is frozen and thaw if so
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Step 2 Engineer only
If not frozen, a Gas Safe engineer should clean the condensate siphon inside the boiler
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.