FA 306
FAULT CODE
Worcester Bosch
False Flame — Ionisation After Burner Stop
High Severity
Engineer Required
The boiler has detected ionisation current (flame signal) after the burner has been commanded to stop. This is a serious safety fault across multiple Worcester Bosch models.
Step-by-Step Fix Guide
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Step 1
Turn off the gas isolation valve
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Step 2
Turn off the boiler
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Step 3 Engineer only
Call a Gas Safe registered engineer immediately — the gas valve needs urgent inspection
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.