thescruff
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Stop playing with it.
Water has oxigen and when it's heated the air is released, plus you probably had trapped air when you filled it. Its normal to get the odd 10sec squirt of air for a few months.
And the pressure is supposed to rise when the boiler is turned on, worry if it doesn't go down again when cold, or goes near the 3bar mark when the htg is on.
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