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I need urgent help. I have just cleaned my NO Nonsense filter system (similar to a magnaclean ) and I closed the valves and carefully removed the tube and washed it out. I reinserted the tube and re opened the valves etc but now my heating won't work. The flow pipe is hot but the return is...

I have a worcester bosch 29cdi less than 1 year old. My boiler is generally set on 1 bar. However I have tried to raise the pressure to 1.5 bar several times making sure I do it when the boiler is switched off and has cooled down. The needle does rise and it stays on the new setting until the...