F15
FAULT CODE
Glow-worm
eBUS Voltage Fault (Older Ranges)
Medium Severity
Engineer Required
On Glow-worm Flexicom and Ultracom models, F15 indicates an eBUS voltage failure.
Step-by-Step Fix Guide
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Step 1
Check wiring between the boiler and any connected controls
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Step 2
Turn off at mains for 10 minutes
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Step 3 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.