When you recharge the system to around 1.25 Bar cold, does the pressure hold. If it does then monitor the operating pressure as the system starts to heat. It should rise by approx 0.5-0.75 Bar during operation. If the pressure rises to around 3.0 Bar then water will be discharged via the PR valve and will result in low pressure when the boiler switches off and cools.
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by DEEARR2 » Sun Dec 19, 2010 1:10 pm 