F43
FAULT CODE
Glow-worm
Generic Internal Error (Flexicom/Ultracom)
High Severity
Engineer Required
On Glow-worm Flexicom and Ultracom models, F43 indicates a generic internal fault code.
Step-by-Step Fix Guide
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Step 1
Turn off at mains for 10 minutes, then restart
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Step 2 Engineer only
If fault persists, call a Gas Safe engineer
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.