Baxi boiler pressure too high and now too low to operate. How to pressurise

Discussion in 'Plumbing and Central Heating' started by Bkkee, 28 Oct 2016.

  1. Bkkee

    Bkkee

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    Hi,

    We just moved in to this house with a baxi combi boiler. Initially the pressure bar showed the highest level (just below max of 4). Having no prior experience with boiler issues I just ignored it. After a couple of days the boiler stopped working which I believe is due to very low pressure (0.2) bar. I bought and tried a flexible filling loop (using manufacturer part number) but each time I remove the loop the water gushes out of boiler pipe. Here's how I did it;

    I closed the valves, then removed the end caps, then connected the filling loop, opened the valves, got to the desired pressure of 1.5 bar, closed both the valves, detached the cold water end of the loop without any problem but as soon as I detached the end from heating return (pipe on the right, attachment 1) all the water gushed out until the bar got back to the same old position and leaving everything around me pretty wet. I can't figure out what am I doing wrong here. Am I supposed to open the heat return valve before removing the loop from this end?

    Secondly, the fact that the bar had previously reached max level does it indicate a more serious problem?

    I have also spotted a little bit of leakage under the valve on the side of one of the radiators. Please see attachment 2. Not sure how much role would it have in lowering the pressure.

    All suggestions would be highly appreciated.

    Thanks
     

    Attached Files:

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  3. Madrab

    Madrab

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    Did the boiler come with a service record? Is the property yours? The rad valve leaking will give a pressure loss.
     
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  4. Bkkee

    Bkkee

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    We just bought this property. There's no service history unfortunately. I'm just surprised by the force the water came out when I removed the filling loop.

    Thanks for your reply. The radiator has definitely not lost as much water as I witnessed when the pressure dropped from 1.5 to 0.2. Do you think that little loss of water from radiator could have suddenly brought down the pressure from height of almost 3.8 within a couple of days? Sorry I'm totally new to this stuff and can't really relate the issues.
     
  5. Madrab

    Madrab

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    What model of baxi is it? I'd be getting a safety and service check performed on it if I was you. The pressure should not have risen above 3bar as at that point the PRV Blow off valve should have activated, if it didn't and gauge is correct then it has an issue with a key safety feature. Get it serviced, that way you can be sure it's all ok. A small leak on a valve can drop all the pressure from a boiler in a couple of days quite easily, again get the RGI to check it.
     
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  7. Bkkee

    Bkkee

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    I think it is 80HE (not too sure about HE bit). Well our new energy provider has offered a free boiler service but they won't be in until the end of next week. I've called in an engineer tomorrow will share it here once I find out about the issue. Thanks for your help.
     
  8. gigz

    gigz

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    Its no good just putting the braided hose where those caps are. The filling loop should have had two valves on (one a non return). Fill then close the two valves. You can get intergrated filling loops for that boiler model.
     
  9. Cgas

    Cgas

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    Or....possibly be an existing filling loop maybe in the cupboard below boiler? Doubt they've been filling it like that the whole time...
    The pipe on the far right hand side (22mm) has a tee off it to 15mm which will possibly have the filling loop attached
     
  10. AGAS

    AGAS

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    Bkkee might want to sort that leak out maybe on the return ( if still leaking that is )
     
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