A gas engineer describes finding an unscrewed flue test cap in a loft that corroded the boiler top. He was rushing through multiple jobs when he missed it. He stresses the need to double-check your work before leaving a site.
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If you doubt yourself as a gas engineer, you need to go back and have a look. I went to do a gas safety inspection and boiler was in the loft, and when I got in the loft, I noticed that the, the flue test point cap, it was not screwed on, it was just left next to the boiler, and the top of the boiler was all rusted where the flue gas has been corroding the top of the boiler. Now that is where someone's rushed. Now a lot of us have done that, we've all done it, but normally you realize you've done it when you've driven away. And you turn around and go back. But silly things like that happen more often than what they should, especially when people have got a lot, lot of jobs on.