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Well, I got my downstairs radiators working - I turned the pump up to a faster speed, shut off all the upstairs rads and drained about a third of a bucket of water from the furthest dowstairs rad (which got some air out after a while). Then turned the upstairs rads back on and the whole system...

Thanks for that. Just as well I left the seal in place then! Disturbed that I didn't know what was going on inside the cabinet, I awoke this morning with renewed energy and so took the cabinet back off. No leaks! I took the inspection hatch off on top of the flue so that I could...

OK - I telephoned the silcone manufacturers as the container did not specify a curing time. A thickness of quarter inch in a very hot spot meant 48 hours advisedly but they said that this sealant was not meant for direct flame contact. Wonderful advice from the heating supply store in selling...

I just answered my own concern above by telephoning Ideal, the manufacturers - but the above may still enlighten someone else so can be left. I have been told that the sensor on the exchanger is not straight into water but is actually encapsulated in a pocket of air and so therefore cannot...

Thanks soggy_weetabix, my thoughts exactly. OK, well I have removed the front of the heat exchanger and can confirm that the O rings were what was leaking as the exchanger is otherwise sound. It is a simple setup - four holes, one on each corner, which obviously mate up when the two halves are...

I have now found the drain point in the pipework underneath the boiler, accessible via the smallest hole in the world. Ideal advised me that the boiler was drained from the system and not direct from the boiler, hence I knew where it had to be logically located.

Thanks namsag - you are correct - I misunderstood Micks reply - I was so focussed on the outside I forgot that on the other side of the sealant was..the flue! Placing sealant here in order to prevent flue gasses from occupying the outer case makes sense. The fact that the only way for water...

Thanks again Mick - the sealant in this case is not sealing against flue gasses as it is down each side of the water jacket (exchanger). The heat exchanger has a hole up the middle around which are the inner fins of the exchanger itself. At the top of the exchanger, one can see the flue...

I think that ANYONE having to come back to ANY job in ANY field of endeavor has to ask themselves serious questions after visit 3 or 4..like 'what am I missing here..?' Not referring to this case in particular, it is dangerous for anyone to develop a 'fixed idea' about either their own...

Thanks Mick - I take what you say to mean that the two halves (front and back) are bolted together whilst sandwiching one or more gaskets between them. The sealant I describe is all down the seam created by the coming together of the two halves of the exchanger - runs down the edge of where you...

Hi - I would appreciate some advice - the boiler Ideal Concord WRS 255A has a small leak in the top of the heat exchanger. I have removed the outer case and the flue cover in the top of the exhaust and can see that the leak seems to be coming from the top left corner of the exchanger and in...