BoilerFaultCodesWhat the manual says
Manufacturer manualFan unit waiting period
From this model's manual
Verified against the Vaillant Ecomax 613 installation & service manual, page 45.
What causes this fault?
This fault occurs when the boiler's control system detects that the fan is not spinning at the specific speed required to safely clear spent gases from the combustion chamber. The most common reasons are a build-up of debris within the fan motor or a communication failure between the main circuit board and the fan's power supply.
Engineer required
This is a high severity fault. Stop using the boiler and call a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.
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