20
FAULT CODE
Alpha
Flame Sensing Fault
Medium Severity
Engineer Required
The flame sensing electrode is not detecting the flame correctly, or there is a PCB fault affecting the ionisation circuit.
Step-by-Step Fix Guide
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Step 1
Reset the boiler once
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Step 2 Engineer only
If fault persists, call a Gas Safe engineer to clean or replace the flame sensing electrode and check the lead
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.