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He hasnt left it working - its fully switchied off at the main valve. He cleaned it and tried it but i think somewhere after cleaning the corroded section must have burnt through or fallen through so now the hole remains. Just to clarify, I assume there would be signs of water in the bottom of...

Hi Tony, Yes a 5mm rod would probably be able to be pushed through the hole in the top of the burner (the bit where the flames come out). possibly 7mm. Is that bad bad? I assume signs of water in the bottom of the boiler when cold would indicate a leaking heat exchanger or would we need to...

Thanks agian - how would I know if there was a definate leak when the boiler is off ( as it is off now)? Will it continue to drip down into the floor of the boiler constantly? If there is a leak, how can it be traced as theres rows of fins etc in the heat exchanger - does a leak mean that part...

After cleaning away some of the surface rust, he has shown me a small area on the top surface of the burner (where the small gas outlet holes are) that has corroded through and now there is a 7mm sized hole through the shell of the burner. Is this why there may be yellow flames? Does this mean...

This is good to know thank you! It did look very rusted when he took it out - is there a risk that long standing rusting will have corroded through the metal completely? He wondered if there may have been a crack under the rust is what he told me. How important is the lint guaze bit inside the...

Thank you for your honest reply. So it it usually the dust that causes the yellow flames or blockages to the little holes in the burners? Could it be a sign of damage to the actual burners themselves such as early cracking or problems like that?

Looking for some advice please as im not a professional. Got an Ideal Mexico CF 100 boiler (approx 20y old) which has 2 burners side by side. It has not been regularly serviced but when i got a gas Safe engineer to service it last week, he said there was uneven burning and one of the burners...