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Help! We have been having a problem with our Viesman combo boiler for months. The pressure keeps dropping! We had a plumber round on friday and had all of the floor board by all the rads up and had a lad crawling round the tiny gap under the house but all rads are bone dry. There is no...

I am having issues with a vokera linea max boiler. 04 message which says either pressure or condensate trap issues. I have checked the pressures, thawed the pipes and emptied the condensate trap. When I emptied the condensate trap the boiler started working again for about 5 mins but took a...