BoilerFaultCodesWhat the manual says
Manufacturer manualOperating hours heating
From this model's manual
Verified against the Vaillant Ecotec installation & service manual.
What causes this fault?
This is not a mechanical failure or a sign of a broken part. It is a diagnostic status code that appears when you access the information menu to track how much work the boiler has done. The display simply shows the total cumulative number of hours the system has been active in central heating mode since it was first installed.
DIY fix possible
Press the 'Back' or 'Menu' button to return to the main displayNo further action is required as this is an information message
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