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Pressure shows 0 psi greenstar 30si

How do i increase pressure on boiler?

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Open the water feed by raing the brass flat lever to 12 psi

Posted on Aug 03, 2009

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Posted on Jan 02, 2017

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Why does the pressure guage indicate zero a few days after adjusting to 1.5 Greenstar 37CD Boiler


This will show that you have a water leak on your boiler or pipe work .

Aug 17, 2016 | Water Heaters

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Why does the pressure rise to over 3bar when the central heating is in operation ?


3 Bar = 43.5 PSI When you heat water it always expands increasing pressure.
In a closed vessel volume can increase by 2-3%. Either expansion tanks allow for this and PSI is maintain or without an expansion outlet the PSI will increase in proportion to heat supplied.
Is this a low temp hydronic boiler operating at or <140F, a hi temp hydronic boiler @ >180F or steam boiler?

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Greenstar 30si


this is your safety valve letting by first try and check ur pressure bladder shud b 28lbs squr inch if it isnt pump up to 28 what happens if the bladder has no pressure then the water has no were to go but out through to pipe water expands when hot and thats why un have to top up the other problm is safty valve worn out needind replacment hope this helps u Susan

Sep 21, 2013 | Water Heaters

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I have an Amtrol 109 tank on my boiler mounted horizontally (all the literature shows the tank mounted vertically). Lately, the pressure on the boiler slowly bleeds off. I've been told the Amtrol tank may...


If you are losing boiler pressure, it is probably not the expansion tank. Most of the time when these go bad they fill with water and cause a increase in boiler pressure, especially when the boiler is running. If you put a tire gauge on the end of the tank it should read between 10 and 15 psi. If this is the case then the expansion tank is fine. If the tank is fine then you may have a leak somewhere in the system. The perculating that you refer to could also be from the boiler being under filled. Make sure all zones are purged of air and the boiler pressure reads around 12 psi on the gauge. Hope this helps

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2 Answers

Worcester bosch greenstar 25Si?30Si pressure gauge showing high


a couple of things , is your filling loop disconected ? , and are all your radiators blead from air, have you got a high point where the air can get stuck in system say pipes going into roof etc you may need to fit a air release valve in line at highest point to remove the air from system , your boiler should be around 1.5 bar running preasure average setting . if you are constanly filling with water you could be exceeding the pressure valve limet which releases pressure from system this could be faulty ?

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