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This morning both upstairs rads are midly warm, downstair loops is still freezing cold, gonna try adn replace the pump this morning

thanks, for the speed reply meldrew's_mate, pump failure is my primary suspect, i assumed because i had hot water exiting via the CH feed pipe that the diverter valve must be open, or is that a false assumption ?

Hi guys, woke up this new freezing cold morning to discover that during the night all my rads had gone cold, immediately went to check my boiler (Potterton Puma 100e) and found all to be in order, and found the CH feed pipe to be hot, further investigations found that the feed pipes to all...