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

Gauge normally showsreading between 1-2 which i take to be correct. however when the heating was switched on today the gauge showed nearly 3. it started to drop after heating was switched off.

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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 ?

Posted on Feb 05, 2009

  • paraplumber Feb 06, 2018

    Probably just needs a service. Sound like the pressure vessel has become depleted. The boiler needs depressurising, then the pressure vessel needs charging to 1 bar until the pressure gauge stops responding. Once the pressure gauge stops responding charge the vessel to 14psi, refill the boiler to 1 bar when cold and it should be ok. If you keep losing pressure it could be the pressure relief valve has got contaminated and is allowing water to drip to outside

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Boiler fires for short time only then seems to switch off. we have tried over ride button but it only works for few seconds

Posted on Jan 08, 2010

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Posted on Jan 02, 2017

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