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The pipe seems clear. I also blow down type and that lenght of the pipe seem clear.

That is going to be easy to check. I can use a electrical fishing wire as the vent is close to the tank.

I connected the cold water to the boiler and tried to fill the system. Water got to the tank, if I am correct the pipe is not blocked or could it be?

Hi, I have oil fire central heating. There is small water tank in the attic. When I drain the heating system from the lowest point most of the system is drained. I noticed the tank was still full. The system refuses to fill from the tank. I tried to put water through the system via the...