Kes Posted March 15, 2013 Report Share Posted March 15, 2013 Hi all, need some advice - I have a Worcester Bosch Greenstar condensing boiler which has just made a loudish semi explosive noise in apparently the chimney - almost like fuel burning outside the main combustion chamber ? Able to hear it almost anywhere in the house. Very disconcerting. It seems to have righted itself and is now apparently working normally - anyone know what might have caused it? Should I be more worried than I am already !!!! ny help greatly appreciated. Cheers Quote Link to comment Share on other sites More sharing options...
-Mongrel- Posted March 15, 2013 Report Share Posted March 15, 2013 (edited) It's explosive ignition, caused by a slow ignite which allows more gas/air mix to build up than normal which then ignites in the combustion chamber usually but i have seen a flame exit the flue! Have you had it serviced recently? A few things can cause it but a common one is the gap on the spark electrode (bit like a spark plug), if it's too wide or close then a weak/small spark is produced and bingo! Boom! Oh, to put your mind at rest, generally alarming but not dangerous. Does need sorting though. Edited March 15, 2013 by -Mongrel- Quote Link to comment Share on other sites More sharing options...
Asa Bear Posted March 15, 2013 Report Share Posted March 15, 2013 It's explosive ignition, caused by a slow ignite which allows more gas/air mix to build up than normal which then ignites in the combustion chamber usually but i have seen a flame exit the flue! Have you had it serviced recently? A few things can cause it but a common one is the gap on the spark electrode (bit like a spark plug), if it's too wide or close then a weak/small spark is produced and bingo! Boom! Oh, to put your mind at rest, generally alarming but not dangerous. Does need sorting though. Not seen it on a Worcester before. If you'd said you had a Baxi Barcelona I'd be worried. Quote Link to comment Share on other sites More sharing options...
dazsl Posted March 15, 2013 Report Share Posted March 15, 2013 Not common on Worcester but get it serviced it will save you in the long run Quote Link to comment Share on other sites More sharing options...
stokie Posted March 15, 2013 Report Share Posted March 15, 2013 Are you sure it's not Santa stuck in the chimney ... Sorry couldn't resist Quote Link to comment Share on other sites More sharing options...
figgy Posted March 15, 2013 Report Share Posted March 15, 2013 :lol: Figgy Quote Link to comment Share on other sites More sharing options...
Doc Holliday Posted March 16, 2013 Report Share Posted March 16, 2013 Was it just a single 'explosion' that happened a few times or was it a more prolonged affair? If the latter then it could something called 'light back' which makes a very alarming noise. As said previously the modern condensing boilers are less prone to it but it should be checked none the less. You should have your gas appliances serviced annually. Not saying it isn't muck on the electrode tip, as that can happen. I've also seen the igintion electrode worn down to a cone on the HE ZWB 7-27 so never say never. Quote Link to comment Share on other sites More sharing options...
Del T Posted March 17, 2013 Report Share Posted March 17, 2013 A fault can be overspeed of the fan during the ignition sequence causing too much gas being drawn in. Poor electrodes,fan seals etc should be checked when you have it serviced if it keeps doing it. Quote Link to comment Share on other sites More sharing options...
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