I have a recurring problem with a Baxi Solo 50/4 RS. It's been running well for a while just providing hot water but it's now stopped and the pilot is out. When I light the pilot and create a demand for hot water it fires up but cuts out after about
10 seconds. In the past I have had to clean out the balanced flue because leaves had found their way in. I have also previously managed to get it going with lots of radiator bleeding. It is more troublesome when I am using it for heating - goes wrong more often. The boiler heats water in a cylinder upstairs where there is a 'finger' bleed valve. Have bled this extensively but no air seen. There is a feed tank in the loft and the water level is correct. I would like to get into the heat exchanger to see if there's any rubbish in there but it's not as straight forward as my old combi as there is some pipework (thermocouples?). If there is an airlock could the boiler overheat in just 10 secs? If above true then I welcome suggestions to deal with it as it would br great to have a hot shower!