F29
FAULT CODE
Glow-worm
Flame Loss During Operation
Medium Severity
DIY Check Possible
The boiler ignited but then lost the flame during operation.
Cold Weather Note
Frozen condensate is the primary winter cause.
Step-by-Step Fix Guide
-
Step 1
Check condensate pipe for frost
-
Step 2
Thaw if frozen, then reset
-
Step 3
If fault persists in warm weather, 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.