Vaillant ecomax pro boiler fault

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Hi guys have a fault on my boiler f06 had a look on their site and it says (flow ntc fault) any ideas what this means?
 
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It means there's a fault with the flow NTC, probably needs replacing
 
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Hampshire
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Now for some reason when I switch the boiler on the LCD display does not come on and the boiler sounds like its gonna take of like a motor revving?
 
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