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open vented yes

Hi I have no HW this morning on my gravity fed system, I have an Icos boiler that fires up and the feed pipe gets very hot, the pump in my airing cupboard sounds like it's working and can hear water flowing but the pipes are all cold/luke warm to the HW cylinder or the 3 way valve. The...

Thanks for the help, repeated filling and emptying it is then. Any tips for the easiest way to get the stuff into the system in the first place, I was going to put it in the header tank and drain the system partially.

I'm planning on flushing my open vented CH system with X400, when I come to drain it out a few weeks later, as my heating pipes downstairs are below the floor level, will any residue stay in the pipes as they are below the level of the drain off valve. How is it possible to make sure I remove...

My drier will not heat up, I have tested the heating element and it is not faulty. On the exhaust part there are 3 sensors, looking from the front of the machine the first one is on the top near the front and has 2 orange wires going to it and I have tested it and it's open circuit - is that...

Thanks for the replies, how much more should I open it, 2 turns ?

The boiler is an Ideal Icos condensing boiler

I've just moved into a new house and had a few problems with the CH system. Just trying to understand what does what etc... Could someone please help me to identify the 2 red headed taps in the picture and let me know what they do, the lower one was virtually closed when I was draining...