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Gents, The pump is Thermowatt and the heating system is Aristan. Can somebody recommend me a good website or book that I can read about. I have tried to balance the system and it looks like that it goes back to normal. The Central Heating in the lounge is cold. I have tried to switch...

All, Looks like I have a Central Heating issue in my flat. The lounge where I need the heat the most has a radiator which is partially cold. I know that there's no air because i have switched off the other radiators except the one in the lounge and this works fine. So I switched the radiators...