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Re :-easyflow "Think at this point your only option is cutting out sections of heating pipe work, its my guess you will find a blockage that is coal like material and even a screw driver will have trouble diggin it out, had one like this last year 22mm T close to the boiler was blocked solid...

Seeing out system will not run at all now as the boiler cuts out after just 5/10 minutes and does not heat up anything at all except the boiler I don't think it worth putting anymore in. I think the X400 relies on the heat to work and needs to circulate in the sytem not just sit in it from...

No he didn't double dose. He used Sentinel X400 then the X100 inhibitor after the system was drained a refilled 4 weeks later. (That was when it was done 4/5 years ago when we fitted new radiator valves) This time he added the X400 and the boiler cut out about an hour after and will not run...

Thanks Slugbabydotcom & The Baker for the last two posts which seem to address the problem It looks as if it is a severe blockage below the pump. We drained the system and took off one piece of the pipework today and fushed again but the boiler still locked out after 10 minutes so we didn't...

Re last post from The Baker. Thats what I was thinking. Our boiler is a 1985 Myson Valaire oil fired. We concidered getting a new one a couple of years ago before the new regs. came in but one of our quoters said there wasn't must to go wrong on them and that it could keep on going for...

PS Boiler engineer just checked the boiler & he says it got no air blockage & the thermostat is fine so it is a blockage. I guess its a Powerflush we will have to go with. Not sure if everyone charges £500. Might try a few more quotes!

The Baker I found this tip when I Googled the problem so cannot take credit for the idea! Twgas The first thing we tried was adding Sentinel X400 & we bought the X100 to add later but soon after adding the X400 the boiler just cuts out every 5 minutes so we cannot circulate it.

Thanks for reply. I have tested the pipework below the pump with a magnet & it is very magnitized below the pump & on the pipe & bend that go across and around a bend. The system was washed down and flushed through and my plummer says there is no air locks in the pipework or radiators but...

Wondered if anybody has any ldeas that may help solving our heating problem. When we got back from a month away last week the radiators downstairs were all cold but upstairs was very hot. We had left our thermostate which is downstairs in the hall set on 15 degrees and the timer on constant...