So my boiler began to burp fluid out of it's overflow valve last week. As I understand it this is often a sign of a bad expansion tank, but my expansion tank isn't waterlogged, I can tap on the bottom half or so and it's empty air, while the top half is filled with water. However, when I tried to measure the air pressure only water came out of the the air valve at the bottom.
Is the expansion tank bad, or should I look elsewhere for the problem?
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