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I think if you replace your circulator you will find that you will regain your heat. If the circulator is not running then your boiler will shut off because it is up to temp/hot.
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If you do have a low water level or pressure safety that is possible. However, if the circ pump isn't running, the boiler comes up to temp fairly quickly and then shuts off because it is hot. First thing to do would be to replace circ pump. Have you done that yet?
What is the pressure on the pressure gauge?
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