F23
FAULT CODE
Saunier Duval
Water Circulation Fault
Medium Severity
Engineer Required
Insufficient water circulation detected — possible pump failure.
Step-by-Step Fix Guide
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Step 1
Check system pressure and bleed radiators
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Step 2
Reset once
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Step 3 Engineer only
Call a Gas Safe engineer to test the pump if fault persists
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.