F7
FAULT CODE
Ideal
Low Mains Voltage
Medium Severity
Engineer Required
The mains voltage supply to the boiler has dropped below the safe minimum (185V).
Step-by-Step Fix Guide
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Step 1
Check the mains supply voltage with an electrician
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Step 2 Engineer only
Contact a Gas Safe engineer or electrician
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.