F23
FAULT CODE
Ferroli
Flow/Return Differential Too Large
Medium Severity
Engineer Required
The temperature gap is too high.
Step-by-Step Fix Guide
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Step 1 Engineer only
Check pump operation 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.