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What are some tell tale signs of a cracked heat exchanger?
Need some help here. I noticed the other day the my how water boiler had flames dancing around underneath the heat exchanger. From what I've been told and read, it could mean that my heat exchanger is cracked. When the the cycle stops, I don't hear any "hissing" after which could mean water leaking out of the exchanger. Should I be concerned with the dancing flames? Worth having a Pro come back and look? It was serviced\cleaned this fall.
Thanks for reading.