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Powermax boiler 155, when boiler reaches operating temperature the presure relief vale blow's off at 3 bar, when it cools down the presure go's down too, right down to zero needing a water top up before a next day restart, the whole system has been bled and there's no air locks, can anyone advise me please...

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  • paul3341 Apr 06, 2009

    I HAVE DRAINED AND REFILLED THE SYSTEM,BUT THE BURNER WILL NOT COME ON

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My hot water is fine but cant get my central heating to work i have a powermax 155 pls help its cold

Posted on Nov 24, 2008

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Sounds likes you have a hot water system. Some where you have an expanion tank that is full of water and it should be half full. It will a round tank above the boiler and may even have a site glass on the end off it. It will have a special valve on it to lower the water level in the tank. The tank is to absorb the expanding water as it gets hot, and releases it when it cools down therefore preventing your relief valve from popping off.

Posted on Oct 14, 2008

  • butch welch Oct 15, 2008

    You may have a bladder tank instead. It is about the size of a five gallon bucket. It will have a valve steam in the top of it.Check the air pressure in it and it should be maybe 5 or 7 lbs. No water should come out of it if you take the steam out. This tank can be anywhere in the system but they are usually above the boiler. Good luck

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