C6
FAULT CODE
Ideal
Flow/Return Differential Too Large
Medium Severity
Engineer Required
The temperature gap between flow and return is abnormal.
Step-by-Step Fix Guide
-
Step 1 Engineer only
Check pump and bleed radiators
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.