Saunier Duval thema classic F24E losing pressure

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14 Apr 2008
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Location
Glasgow
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United Kingdom
My boiler is now refusing to start as there is not enough pressure in the system.Have tried to top up the pressure with the blue knob underneath but when I turn it nothing happens as if a valve somewhere is stuck. It used to pressure up no problem last year.

Boiler is 4 years old now and never had much problem with it.

Can anyone help??? Ta
 
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Very common fault is that the spindle in the filling valve ( the blue handle) breaks internally and leaves the seat jammed in the valve so no water can pass into the boiler through the non return valve( the brass cylindrical bit at the end of the short copper pipe). Easy repair , new filling valve required .
Other solution is fit an external filling loop...... good luck :D
 

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