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Pressurising the vessel made no difference. I've noticed the vessel remains cold. I'm guessing it should get hot. is this a sure sign that the pipe is blocked? thanks.

Have Saunier Duval F24E Thema Condens Combi boiler. Since moving into house in March the hot water has been cycling hot and cold every 15-30 seconds or so. One month back pressure would simply drop and then leak out lots through overflow requiring a top up. Had PRV replaced and now...