E430
FAULT CODE
Potterton
Water Pressure Test / Test Failed
Medium Severity
Engineer Required
The boiler is performing a water pressure test (normal on commissioning) or the test has failed, indicating a potential system leak.
Step-by-Step Fix Guide
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Step 1
If this appears during initial commissioning, it is normal — wait for the test to complete
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Step 2 Engineer only
If E430 appears with a crossed flame symbol (test failed), call a Gas Safe engineer to inspect the system for leaks
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.