I apologize for how long its taken for your question to be answered.

I don't think it was the intention of the manufacturer for the espresso maker to make an ear-splitting whistle. I've never owned one quite as large as yours (we have a small version in our backpacking supplies and a 6-cup at home), but neither of ours whistle.

I wonder if you have a machine with a faulty pressure valve? The most logical explanation for the whistle on this coffeemaker - where steam and pressure are part of the process - is the escape of the steam pressure. Since you mentioned the valve, that would be my first guess. In that case, I'd take it back to the store for a replacement.

My other thought is the gasket has some teeny leak allowing pressure to escape between the two chambers. I think this is less likely, but the gasket can be replaced to eliminate this possibility.

While doing research for this question, I found no similar problem mentioned (but a lot of happy owners). I recommend taking this machine back to the store for an exchange. This is the least costly option to you and is most likely to fix the problem.

Happy brewing!
Source(s):
http://www.rateitall.com/i-1077687-bialetti-moka-express-stovetop-espresso-...
http://www.fixya.com/support/p6921-bialetti_moka_express_6_cup_coffee_maker


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