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F75 fault with Vaillant when pressure is okay

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diynoob123

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Can someone help me understand what could be causing this fault?
It only seems to happen when the pressure in the boiler drops below around 1.5 - 1.7 bars otherwise it works fine.
The boiler is a Valiant Eco fit pure 835 and the building is a 3 storey house with 10 radiators.

Thanks
 
The pressure switch has a min of 1.5 bar so you need to be above this
 

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