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Unlikely but will speak to the wife on that one.

Nice to get an answer though. Thankyou all for your help. I will start at the easy end and hope.

That is fine I just wanted advice first. To do that means pulling up floorboards in 3 rooms and moving a double wardrobe that took 4 of us to fit. Oh well :(

I have a 4 m coil drain cleaner that I have tried from both ends and can maybe get a meter each way before hitting what feels like either a tight bend or a t piece. Have sealed a hose pipe in and added a bar of pressure in each direction with the other end open and got nothing.

Power flush was connected in place of the pump. So I have established flow from the boiler is clear and that is also how boiler is filling initially. There is water up to the bypass valve. Just nothing between there and the boiler.

Rads fill and bleed and you can hear the water circulating when the pump first starts after filling. The boiler fills via what should be the outlet from the boiler and have disconnected the fill/ return to the boiler and i get nothing.

From there point of view the system was clean. No contaminents but boiler still would not fire and displayed no flow. Only by physically removing pipes and turning water supply on have I discovered the lack of water at the boiler.

Pump is brand new. Power flush has not shifted it.

So all valves are fully open the H piece has been cut out expecting it to be blocked. So is my only option to pull up floorboards and cut out the blockage?

Yes flameport. Sorry as I said im not a plumber so terminology might not be correct

So Right hand pipe is cold water feed left is return/ vent.

Ok sorry by vent I mean the open side of the system. So boiler output

Well im assuming that as it is an open system and it has a H section above the pump it is backfilling due to the blockage.

Well the answer to why I kept changing plumbers is the same reason why you don't follow how all that has been done without any of them noticing it filling by the vent. I am not a plumber and it took me about an hour to figure it out. Is there anyway of clearing it without removing the pipe? I...

Hey, so after several weeks, several plumbers and many hundreads of pounds, I still have no hot water or heating. I have and Ideal Logic heat 24 (not combi) open vented sysyem. It displays fault code for no water flow. New flow sensor fitted, new pump fitted and power flushed. After losing...