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For anyone else coming to this post by search engine, I had similar issues. I eventually nailed it down to the order of power-off of my OpenTherm stat and the boiler. I had powered off the boiler before disconnecting the power to the stat. This yielded the 83 error and endless radiator running...

Recently I had a tile (approx 6" square red tiles) slip on the edge of a valley, which seems to have exposed a problem. The tiles appear to be laid on felt, on top of sarking, and the valley seems to be lead. As far as I can tell from a distance and from the inside, the felt doesnt reach the...