Finally we have a stable heating system! It turns out that our pellet boiler electronics is very sensitive to any voltage changes. The first indications of abnormal behavior was that it would frequently shut itself down and display an error message (alarm pellet) - which at first made everyone think that it was a configuration problem (52 parameters can be set on this thing).
But in the end, the problem was traced to small dips in voltage every time the water pump or refrigerator kicked in. So I fitted a domestic voltage stabilizer and that seems to have done the trick!
Oh and another leak was discovered last week; which was traced down to a drywall screw that had been driven right into the center of a 3/4" pipe! Fortunately it was fairly easy to repair, I just need to patch the drywall I cut open to expose the leak.
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