I1
FAULT CODE
Biasi
Ignition Failure / No Flame
Medium Severity
DIY Check Possible
The most common Biasi fault code — the boiler has failed to ignite or lost its flame. Can also be caused by a frozen condensate pipe in winter.
Cold Weather Note
Code I1 in winter on Biasi boilers is very commonly caused by a frozen condensate pipe. Thaw with warm water before resetting.
Step-by-Step Fix Guide
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Step 1
Check gas supply — try other gas appliances
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Step 2
In cold weather, check for a frozen condensate pipe and thaw with warm water
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Step 3
Press the reset button on the front panel
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Step 4
If fault persists, call a Gas Safe engineer to check the ignition system
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.