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glow worm combi 100E-Low Gas Pressure-1 Bar

Discussion in 'Plumbing and Central Heating' started by ADONAI, 16 Jan 2010.

  1. ADONAI

    ADONAI

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    Weve had problem with lukewarm water ,also when the combi switches from CH(heating) To DHW (Water)there is no change in the flame size - I expected it to increase in size.
    Engineer says the gas pressure reading was 1 Bar.He replaced the gas valve but still gets 1 Bar.

    any ideas ?


    Thanks.


    Al.
     
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  3. davebgas

    davebgas

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    Gas pressure 1bar???!!!!! :eek:
    the flames will be 100ft high.
    Your pcb is probably gubbed not sending correct voltage to gas valve for hw.
    You're better off getting someone competent in who knows
     
  4. ADONAI

    ADONAI

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    my mistake - i meant 1 mbar.
     
  5. onlyfitidealboilers

    onlyfitidealboilers

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    what blr you got?
     
  6. ADONAI

    ADONAI

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    glow worm compact 100E .thanks.
     
  7. steve32

    steve32

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    what is the inlet pressure on gas valve or wp at gas meter i presume your rgi checked this before changing the gas valve.
     
  8. Gasguru

    Gasguru

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    It is normal for the HTG burner pressure to be the same as the DHW burner pressure on this model. The burner pressure on HTG can be adjusted down but most are left as the factory setting.

    Providing the working pressure is ok at the gas valve then a common fault on these boilers is for the circuit board to ignite at the ignition pressure and remain at this level say around 5 or 6 mbar instead of ramping up to around 15mbar. The gas valves are normally ok.

    Changing the pcb is not a plug and play job. The gas valve and pcb may require adjustment and setting up with a manometer.
     
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  9. davebgas

    davebgas

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    They do mate and come with a new thermistor that has the be put on. Get an engineer out. NOT a diy job
     
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  11. ADONAI

    ADONAI

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    May sound stupid-but i cant understand the Pressure displayed on the main gas meter outside the property.it appears to have a circular dial with a scale between 0.5 and 1 (whatever that means-sorry) can someone explain how to read it?
    the meter was installed in 1991.
     
  12. steve32

    steve32

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    you test gas pressure with a manometer this is not a diy job, your rgi should have tested it before he changed the gas valve.
     
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  13. onlyfitidealboilers

    onlyfitidealboilers

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    pcb all day long seen this loads of times on this blr.
     
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  14. davebgas

    davebgas

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    Get an engineer, it's a common problem if it's what I suspect and takes about 10mins to prove. Again not a diy job.
     
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  15. ianmcd

    ianmcd

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    DO NOT attempt to repair any PCB on any gas boiler, there used to be some companies out there that claimed to be able to re-furbish PCBs probably still are, I have seen boiler electrics going on fire and boilers with burners staying on after the fan has stopped, if it is the PCB it must be replaced with Manufacturers new direct replacement, get an RGI in its not something you can do yourself
     
  16. gaswizzard

    gaswizzard

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    Saves using a manometer I guess. :p
     
  17. ianmcd

    ianmcd

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    sorry Ronat but its nothiing to do with any experience you do or do not have it is against the law to carry out any AD Hoc repair to ANY gas appliance and the manufacturer would not approve anyone to repair a PCB the only Legal repair is to replace with a manufacturers approved part.
     
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