S.56
FAULT CODE
Vaillant
Status: Diverter Valve Active
Medium Severity
DIY Check Possible
The diverter valve is switching to direct hot water to taps rather than radiators. Normal combi boiler operation.
Step-by-Step Fix Guide
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Step 1
This is normal — the boiler is prioritising your hot water demand over central heating
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Step 2
The diverter valve directs water to the hot water heat exchanger
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Step 3
No action required
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.