I2
FAULT CODE
Biasi
Overheat Lockout (Severe)
High Severity
Engineer Required
A severe overheat lockout that requires manual reset — more serious than E3.
Step-by-Step Fix Guide
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Step 1
Turn off and allow to cool completely
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Step 2
Do not attempt to reset without first calling a Gas Safe engineer
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Step 3 Engineer only
The root cause must be identified before restarting
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.