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Gargling and whooshing noise in central heating and HW pipes

Discussion in 'Plumbing and Central Heating' started by richig, 10 Jun 2016.

  1. richig

    richig

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    Hello,

    Got a open vented Y plan system with a Suprima 30 non condensing boiler (10mm microbore CH). & small rads in a 3 bed house. The feed vent are combined with an air separator. Came back from holiday (boiler off for a week) and noticed the above noises when the HW was turned on. Noises are loudest by the boiler flow and return pipes and in the cylinder cupboard where the valve, pump and air separator are. Noticed the FE tank is quite dirty which thought strange as system was cleaned a year ago. HW and CH are working fine and heating up in normal time - just a bit alarmed by the noise as was not there before we went away. Not had any work done on the system so cannot explain this - dunno what to do. Was thinking drain, refill, x400 but its a bit hot to have system on full for a day or so!
     
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  3. Agile

    Agile

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    Have you checked that your F&E tank is actually connected to the system?

    See FAQ here.

    Tony
     
  4. richig

    richig

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    Presume you mean isolating ball cock, draining some water of a rad with the valve on manual and checking if the level of the tank goes down? ie there could be a blockage in the air separator?
     
  5. Agile

    Agile

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    Yes!
     
    Last edited: 10 Jun 2016
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  6. richig

    richig

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    Ill try that tonight. Any other ideas though or is this the likely cause?
     
  7. Agile

    Agile

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    Most likely a blockage somewhere!
     
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  8. DP

    DP

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    Check pump running
     
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  10. richig

    richig

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    Pump definitely running and water and rads heating up as normal
     
  11. DP

    DP

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    Is water in header tank hot when boiler running?
     
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  12. richig

    richig

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    Not checked that yet - if so what would that indicate
     
  13. DP

    DP

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    Indicate blockage possibly.
     
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  14. richig

    richig

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    Hello all,

    Today I checked the tank as Tony suggested =- all fine so full drain down, refilled with x400 and CH/HW on for 4 hours now. Boiler is remarkably quiet now and gargling etc stopped within 30 min. Dunno what cause was but all ok now. Just one more question. When I drain the first time to get the X400 out, should the sysstemm be hot or should I let it cool. Cheers
     
  15. Scarum

    Scarum

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    Let it cool halfway so you can put your hand on a rad, warm is fine. Flush out the x400 with a few times before final refill with x100 or F1.
     
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