FD 231
FAULT CODE
Worcester Bosch
Mains Power Interrupted During Lockout
Low Severity
DIY Check Possible
The mains power supply was interrupted while the boiler was in a lockout state. This code appears after power is restored.
Step-by-Step Fix Guide
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Step 1
Press the reset button to clear this code
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Step 2
The boiler should restart normally
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Step 3
If the underlying lockout fault returns, investigate the original fault
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.