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PostPosted: Sat Sep 30, 2017 5:25 pm 
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Hi all,

I've got a Worcester Bosch Greenstar 42CDi classic combi boiler which I've had for a short while but only just had radiators/central heating fitted. Yesterday having bled a lot of air out of the rads I noticed that the pressure gauge had fallen to 0 bar... so I turned off the boiler and topped it up (this model has the blue tap underneath so should be straightforward process).

As I topped it up I noticed the pressure gauge gradually rising, exactly as you'd expect. Once it got to around 1 bar I noticed the gauge hardly moved beyond this and seemed to take much longer just to move a fraction - there were some groaning/laboured sounds which I assume is not normal (I've had to "top up" boilers in the past and never noticed this before). Around 1.25 bar I gave up as I was concerned that if it's a faulty pressure gauge I could over-pressurise the system.

Has anyone ever seen this before or any idea how I could go about diagnosing the issue? I've posted a pic of the current pressure which is as far as it seems to want to go right now.

The boiler and heating are working ok at this pressure but to me it doesn't seem right that I can't increase it beyond this level, if there's a fault with the boiler I'd rather get it sorted now!

Thanks in advance for any advice/tips

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PostPosted: Sat Sep 30, 2017 5:29 pm 
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1. 1.25 bar should be fine.
2. Could be your mains pressure is only 1.25 bar (which is higher than the minimum the water boards guarantee). If so, the pressure in the system won't get higher.
3. You could try late at night, when pressure tend to rise with much reduced water usage, but personally I'd leave it where it is.



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PostPosted: Mon Oct 02, 2017 7:54 am 
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Thanks Andy, makes sense that it won't go any higher if that's the current mains pressure!

Cheers


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PostPosted: Mon Oct 02, 2017 8:00 am 
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Does the pressure rise with the heating on ? If so what to ??

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