vaillant ecotec pro 28 f22 error

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My boiler screen is showing an f22 error and the pressure is low.

Could the two things below be the bits that I need to turn?
 

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On the far right of your pic is the valve that you need to turn on.
You need a spanner to turn it 1/4 turn. Usually has a plastic handle ,but your has been removed !
 
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