AS usual the pump valves are U. S. If you have a small heating tank feeding the heating side of the system turn off the water to it, if no turn off tie ball valve up. Drain system at lowest point until water stops running at pump. You then need to replace pump and valves. Do not get slotted quater turn valves. Fit gate type . Refill system and vent all radiators.
If you just have one tank yet again tie up ball valve and drain system, then proceed from drain down above.
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