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Ferroli boiler pressure problem

Discussion in 'Plumbing and Central Heating' started by paul9367, 12 Nov 2007.

  1. paul9367

    paul9367

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    I have just moved house and have a ferroli optimax combi boiler.
    Initially we over pressurised the system and have replaced the pressure relief valve after it relieved the system . We then had problems with system going up to 3 bar and cutting off. The expansion vessel has been replaced. Now pressure drops regularly. The pressure gauge also seems to wildly fluctuate. If we pressurize to 1.5 bar once you close the filling loop the reading will show almost 2 or just over 1 bar. The heating will work for hours and show 1.5 bar but as soon as you switch it off pressure drops to 1 bar or below and we get an error code F37 which means pressure is too low. Can anyone suggest the cause. If it is a leak how do we find it as all downstairs floors are concrete!!!
     
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  3. chrishutt

    chrishutt

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    Could be a partial blockage causing a lot of resistance to pump flow combined with a leak somewhere. Have you had a competent boiler engineer look at it? Who fitted the new expansion vessel?
     
  4. paul9367

    paul9367

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    Thanks for that. It was a friend of a friend who is a plumber

    If it is a leak I have seen Fernox produce a concentrated leak sealer to inject into the system. It is designed for sealed systems. Is there a potential risk with doing this or is it worth a try?
     
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