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thanks for the replies, I discovered the problem was that the valve in the refill loop was switched on whereas it should be off at all times, i have lowered the pressure by bleeding the radiators again and the pressure is stable at 1.5bar. Thanks again for your help. Dave.

whats the name of the valve? the only red handled item there is, is from the diverter valve on the CH flow. Should i be looking for the pressure relief valve? Could the fact of the CH not being on for a while contribute to the buid up of pressure? also there was one radiator on the...

Please help, i have a Europa combi boiler and i cant get the pressure to drop to the recommended 1.5bar, as a desult my overflow pipe outside my building is flowing, i have tried bleeding all the radiators but the pressure has only dropped to around 2.8bar from the 3bar it was sitting at. Is...