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A rhythmic hiss at idle
A "psst" every few seconds
A short spit of steam while the machine warms up is normal: it is the anti-vacuum valve closing.
A rhythmic hiss every few seconds at idle, steam or condensation that keeps coming, steam around the drip tray, or the pump topping up every couple of minutes points to that valve no longer sealing. Owners report it from 6 months to 3 years in.