The bungalow I've bought has three of nine radiators replaced. Switched the system back on and the boiler was cutting out. Found the pump wasn't turning. Got it going and it was making an awful noise for a while, sludge I presume. It's a gravity system, non-condensing boiler, no t/stat, but TRVs on most rads (bathrooms don't have TRVs). I'm expecting to get the boiler replaced in the near future. Do you think it's worth draining and re-filling the system a few times to try and flush out the muck?
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