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Its just boiled again as we speak, it is boiling in the system not the imersion tank, I will check the boiler thermostat. it has four settings and is set on 4 I am going to knock it back to 3 as a start.

So I don;t understand why it boils, I drained the system about three weeks ago and filled with sentina X400, left it three weeks and drained system completely. Then re-filled and added sentinal X100 inhibitor, re-filled system and bled until there was no air in sytem, I.e. heating was off and...

If the pump is fitted on the return side, which makes sense as the arrow on the pump points into the boiler, how does the water boil up into the vent pipe, as it has gone right round the system pass the two way vale and then up the vent pipe and expansion pipe?

Standrad Gravity fed system, but i noticed I have the pump straight out of the boiler, then it Tee's off one goes to the two way valve splitting for rads and immersion tank and the other goes to the 22mm dia vent pipe to the f&E tank, at this point about 5cm from the Tee for the two way valve is...

I have a problem, when the heating is turned off I can bleed all the upstairs radiators and the main bleed from the back of the immersion tank. But when the pump is on and the heating is on, if I try and bleed the upstairs radiators I can open them and nothing comes out they don't hiss and no...

Thanks for the advice, checked routing on new pipes all looks okay followed hot water as rads warmed up. Boiled again this morning, I am going to try the bleed idea, shutting upstairs off and running only downstairs. I noticed also that the expansion tank is churned as the water has change...

I have added new radiators recently and had a leak at the valves, on the return side, I fixed these and bled the system, and due to the location of the new rads increased the pump speed on my Grundfos UPS15-50 from 2 to 3. Thought all was well as all evening good heat all round, heating came...