E12
FAULT CODE
Potterton
Differential Water Flow Switch — Remains Open
Medium Severity
Engineer Required
The differential water flow switch is remaining open when it should be closed. Indicates a circulation issue or a faulty flow switch.
Step-by-Step Fix Guide
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Step 1
Check system pressure and bleed radiators
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Step 2 Engineer only
If fault persists, call a Gas Safe engineer to test the flow switch
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.