F00
FAULT CODE
Heatline
Flow Temperature Sensor Fault
Medium Severity
Engineer Required
The heating flow temperature sensor (F00) or return sensor (F01) has a wiring or sensor fault.
Step-by-Step Fix Guide
-
Step 1 Engineer only
Call a Gas Safe engineer to verify sensor connections and replace if faulty
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.