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As a follow up to my last post after a trip to Maplins and replacing 3 electrolytic capacitors and 3 transistors for the grand total of £0.71... Problem solved!!!

Well having spoken with Sime it appears that the boiler is a good old fashioned Potterton Profile50. I've done some more digging and the air pressure switch seems to be OK. I also tried manually blowing gently down the sense tube and all that happens is that the fan on the system continues...

I must admit that it doesn't seem to be a very complicated unit compared with others. Maybe the reason that my local CORGI engineers are not interested is that it's not chalenging enough :wink: Seriously though... it it possible that it's failing to sense that the fan is running due to a...

I dont' think it's the ignition or associated sensing electrodes since it's not getting as far through the process as firing up the pilot. The problem I'm havin g is finding a recommended CORGI engineer who knows about this boiler. Two I have contacted so far are unable to help. Brian

We have a Sime Superior 50 boiler which is having problems starting up. The fan runs for a few seconds then stops, restarts, stops etc for around a minute before the pilot light ignites the main burners. The problem has been occurring for a couple of weeks and is steadily getting worse...