F81
FAULT CODE
Glow-worm
Pump Stuck
High Severity
Engineer Required
The circulation pump has seized and is unable to rotate.
Step-by-Step Fix Guide
-
Step 1
A Gas Safe engineer may be able to free the pump manually
-
Step 2 Engineer only
The pump may need replacing
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.