y system vented

  1. A

    Heating system water hammer

    Getting water hammer when motorised 2 port Honeywell turns hot water off to the cylinder. Valve works fine and its the right way. System been in for years and its just started happing. Boiler pump keeps running which is correct to dissipate the heat but as soon as the hive turns the hot water...
    • Adam a
    • Thread
    • abv boiler cental heating heating heating and hot water honeywell 42005748-001 hot water cyclinder water hammer y system vented
    • Replies: 4
    • Forum: Plumbing and Central Heating
  2. N

    Y system vented indirect - No hot water

    Radiators are totally working fine.. equal heat bloom on the Thermal imaging camera, but it shows the hot water is only getting halfway from the pump.to the cylinder, even when 3W valve is both positions All 3 Radiators are all hot which proves flow from pump to 3W valve port A to rads and...
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