F10
FAULT CODE
Glow-worm
CH Return Thermistor Fault (Older Ranges)
Medium Severity
Engineer Required
On older Glow-worm ranges, F10 indicates a central heating return thermistor fault.
Step-by-Step Fix Guide
-
Step 1 Engineer only
Call a Gas Safe engineer to replace the return thermistor
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.