F48
FAULT CODE
Glow-worm
Phase/Neutral Reversed
High Severity
Engineer Required
The mains electricity supply has reversed live and neutral connections.
Step-by-Step Fix Guide
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Step 1 Engineer only
An electrician should check the wiring at the boiler spur
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.