hot water dispenser

electric hot water dispenser. worked well for 2 years. it has recently started spitting and girrgling, like it has a lot of trapped air. turing valve on does not clear the trapped air. any ideas are appreciated. thanks bill
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I bet it has an inline supply filter that has become clogged.
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that is exactly how it is acting, but it has no external filter.
wrote:

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Isn't there a safety valve on the top ? Opening that up should let the trapped air out.
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