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    Pump, 3 port valve or boiler problem?

    Y-plan system, Baxi solo 2 boiler. Until several days ago, it has been running smoothly even it is a 20+ years system. Problem: after the first 5 minutes firing up, boiler starts mild whistling then turns on and off every 2-3 minutes. rads are warm. but looks like the hot water also flows to...
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