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Hi my Main Combi pressure goes into red when using hot water. I was told today that expansion vessel may be blocked as i had a new boiler fitted onto old rads. I just hoped id get some idea if that could be the fault.

Power flush needed asap. Worcster Engineers who came out to my Elderly Neighbour who had called them out £300 call out and for that told her she needed a pump but needs a powerflush before as the sludge would damage the new one. I was meant to be working away until 24th Dec but finished the...