F59
FAULT CODE
Glow-worm
Comfort Mode Fault
Medium Severity
Engineer Required
A fault has occurred in the comfort/pre-heat operating mode.
Step-by-Step Fix Guide
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Step 1
Try resetting the boiler
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Step 2 Engineer only
A Gas Safe engineer should check the DHW system
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.