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Water Flow sounds through rads and intermittent groaning
I had an old boiler finally bite the dust so I had a Laars Minitherm installed. Since then there's been a loud groaning the intermittently comes through the rads and walls. It's a two zone system with the first going to radiators on the main and second floors and a second branches off of that going to in-floor heating on the main and basement.
Both zones have pumps, but I'm only hearing the sound when the in-floor zone is active. And it changes pitch from high to low to almost gone when I close the bypass valve.
I've tried bleeding the rads, but there's only water coming out. And the service guys who've come in haven't been much much help.
I'm also hearing a constant water flow sound when I open the rads to a certain point. It sounds like a pipe when the shower is running.