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Vaillant ecotech error message?

I have a ECO Tech and i have error message F75 with a red light can anyone advise. Have no heating of hot water and am disabled

Bal
November 2013
VaillantHeating, Home Heating SystemsError Red Light
water pressure to low fill up to 1.2 bar,take air out from pump,check water pressure sensor may be block need cleaning ,is pump running ,start from 1...2...3 see how

ltd
November 2013

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