F16
FAULT CODE
Glow-worm
Fan / Wiring Fault
High Severity
Engineer Required
The fan has a fault in its motor or wiring. Different from F32 which is a speed fault — F16 may indicate the fan is not receiving power.
Step-by-Step Fix Guide
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Step 1
Turn off the boiler
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Step 2 Engineer only
Call a Gas Safe engineer to inspect the fan wiring and motor
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.