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Thanks again Tony for your reply. I'm not sure about "seeing" through the hole in the restrictor, but I did try blowing through it after removing it from the tube. Last night I took a very fine piece of copper wire and poked it through, as I was a bit concerned that, being a very small hole...

Thanks Tony. Not wishing to tar all CORGI engineers with the same brush, but going on past experience where my wife had to call in BG afterwards, I'm VERY wary of letting anyone near my system, but I hear what you're saying. Just to give you a wee bit of background, I'm an maintenance...

My potterton Profile Prima 80e was not firing up. I traced it to a faulty air pressue switch which I replaced. It will now work ok for a day or so, then stops working again, and when I check with my multimeter, the pressure switch has not reset. I've removed the exhaust bend and checked...