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So I have a different idea. Could I plumb in a new Cold Feed an Expansion as in the diagram attached? Replace the current 90 elbow with a new 22mm tee and put a new 15mm Cold Feed into a 22mm Vent into the tee. IMG_20190926_184000 - Copy by Diyer22 posted 5 Nov 2019 at 4:15 PM

The problem is that the pipes in the loft run about 15 meters (including going down the vertical stack and under the floor) so the joined pipes would be a distance away from the heating loop. Not sure if that would cause any issues or not. It is a Vaillant ecoTEC plus. Seems quite new (only...

Would it work if I put mains down the expansion line to try and blast the blockage in the fill pipe back up to tank? I think the f&e pipes are between the boiler flow and the pump. If I close the gate valve on the pump input then the water and debris can only go up the feed pipe or into the...

So a few follow up problems. I back fed the system and bled the air out. All but two rads worked which I then put down to balancing but I soon realised that the pump was set to 1 (low) and by turning it up to 2 (med) everything then got hot nice and quickly. Slowly it has all gone cold again...

Perfect. I agree, I have read a lot recently, and everything says feed is 15mm, vent is 22mm. Most things also say that the feed and vent should be no more than 150mm apart in order to minimise any pressure difference which could cause pumping (tank behaving like a radiator). The theory makes...

Another layout diagram showing my plans. Pump Reposition by Diyer22 posted 30 Sep 2019 at 8:07 AM Green shows the new pipe work that I plan to put in. For simplicity, I will most likely use compression joints rather than solder. Thoughts please?

So firstly, the vent pipe is plastic and is 15mm not 22mm. The feed is also 15mm. If water was returning to the tank via feed OR return, is it critical? Obviously if they both become blocked the system could explode, but if one is working then all should be ok yes? This is why I am suggesting...

Thank you. My reasoning for replacing both the vent and feed is that they are supposed to be 150mm apart (Maximum) and I don't want to lift the floor, therefore by plumbing in new pipes to the pump, I can eliminate the old feed and vent pipes entirely. Please correct me if I am wrong.

No, I must have not been clear. The system was fed from the tank through a valve into the vent pipe not mains pressure. Also, when filling the system through the drain, water did vent back to tank and them overflowed through the correct pipe to outside the house. So basically it is venting...

So just a quick update as promised. I tried to divert the feed and expansion tank through an isolation valve into the vent pipe in the hope to fill the system through the vent pipe. It did not work. I then tried to back fill the system via the drain port above the boiler and that also did not...

Thank you for reassuring me that this should work. I did think about connecting a wet vac to the cold feed at the tank and try to suck anything back out. For some stupid reason the cold feed and return seem to be under the floor near the boiler, not by the pump which is in the airing cupboard...

So I will most likely do this on Friday as it is difficult to get into my sons bedroom to bleed the radiator when he is sleeping. Could I create a loop fill system from the output of the tank, through a valve, into the vent pipe? This way, it should still be gravity fed, will still be metered...

Unfortunately the cold feed to the system is under the floor boards somewhere so I cannot get to it. That is why I was suggesting blocking them off and putting new pipes into the airing cupboard before the pump. I will cross that bridge once I have got the system working. Thank you.

Perfect. I will give that a shot. Thank you for your help. I will report back when I have done it.

Will the system be alright with mains pressure?

So I have created a rough layout of my heating system excluding the water tank in the loft. The feed and vent go to the vertical stack (about 8m of travel across the loft) as previously mentioned. I am now thinking that they are going to the boiler feed or return lines. Without pulling the...

I see. Thank you. I'm not sure if the pipe goes to the ground floor or the first. There are no radiators near the stack on the ground floor, only the bathroom on the first. The bathroom radiator is also the only one that gets slightly warm at one corner and only when the hot water is on, not...

Thanks for the help. Not sure what you mean by svp area. I also noticed that the pipes from the tank are plastic which seemed a little odd. They also travel a very long distance before they break into the system. Wherever that may be. Would it push the blockage back up if I block the vent pipe?

Thanks for all the help. First of all, still no heating but the water is coming hot, although the boiler seems to be coming on and off a lot. I emptied the tank in the loft this evening and removed all sediment and brown water until there was only fresh water in there from the ballcock valve...

The tank had some gunge in it so I cleared it out as much as possible, before I tried to fill the system. Is there anywhere in particular I should try disconnecting a radiator to burp the system i.e. upstairs or downstairs? I am slightly concerned that something has gone down the filler pipe...