BoilerFaultCodesWhat the manual says
Manufacturer manualOperating hours hot water generation
From this model's manual
Verified against the Vaillant Ecotec installation & service manual.
What causes this fault?
This code is not caused by a breakdown or failure, but is simply a recorded log of the appliance's usage. It appears when the control board reaches a specific interval or when a user accesses the diagnostics menu to check the system's workload. It acts like a mileage counter on a car, tracking how much work the boiler has done specifically for your taps and showers.
DIY fix possible
Press the 'Back' or 'i' button to exit the status menuMonitor your boiler for any actual fault codes starting with 'F'No action is required as this is a normal operational reading
Find a Gas Safe engineer
Search the official register →
Boiler cover options
Avoid the next call-out bill
Monthly cover means no unexpected bills when your boiler breaks down.
Approved partner
Get a quote →
Domestic Appliance Guard
Unlimited call-outs, 24/7 helpline, no price-hike promise
Affiliate links. We may earn a commission at no extra cost to you.