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Pressure dropping on Combi 30SXI Boiler

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  • Pressure dropping on Combi 30SXI Boiler

    Over a 2 day period the pressure drops from 1.7 bar to .6 bar and the boiler will not run Red light Flashing. Corgi engineers stat a leak in the central heating system,but there no leaks apparent i have looked at all the radiators and pipes and no leaks.
    Engineers Have checked pressure unit Ok and have Replaced Safety Valve,but leak still shows after 2 days. Engineer says new Boiler required.Any suggestions please.

  • #2

    Do youmeanits a system boiler? Glowwrom make a 30sxi system boiler. Its a preeurised heating system and and unvented or vented hot water cylinder.
    f so it is prob the coil.


    • #3
      Has the auto air vent been checked/replaced?
      Have the engineers checked the expansion vessel?
      You have quite a quick pressure drop, so could be a small leak on a radiator gland nut or microleaks on joints somewhere in system. I wouldn't suggest changing boiler until a pressure test has been carried out on heating system, even then any leaks at the boiler should be able to be traced and fixed!


      • #4
        Mine did that, I kept topping it up every other day using the screw on the valve ( as the engineer showed me), in the end traced the leak to a washer on a radiator that was dripping the tiniest amount of water behind the skirting so I couldn't see it, got the washer replaced and stopped doing it.
        Don't get a new boiler - way to expensive!I agree with crgracehtngsvs - they sound like they know what they're talking about.


        • #5
          Probably have resolved by now but require the pressure vessel to be repressurised by a plumber. Does not need a new boiler, I have just had mine done under my BG Homeserve agreement, took no more than half an hour