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How my boiler check the water pressure ?

I have a Ariston Clas Boiler,I could not fount any water pressure switch inside it.I dont know ,so how the boiler detect if there is water in circuit or not.
if there will not presence water in the sys. so may be the burner will damage the exchanger when it is ON.
Its appreciated if and one can reply my question.
thanks
Mahan
MAHAN, July 2007
when the boiler is to low on water it will cut out and shut itself down.

read the pressure gauge on the front.

hi-spec plumbing, July 2007
link Click here to see other fixes for Ariston Clas Boiler.