F34
FAULT CODE
Glow-worm
Mains Voltage Fault
Medium Severity
Engineer Required
The mains supply voltage is outside the acceptable range.
Step-by-Step Fix Guide
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Step 1
Check other electrical appliances in the home
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Step 2 Engineer only
An electrician should test the mains supply to the boiler
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.