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I have a Vitodens 100-W WB1C that's stopped working showing a FF fault code. I've tried resetting it which it does OK but as soon as heat or hot water is called the screen shows all it's symbols and then it appears to go through another reset. It does this a couple of times then shows up the FF...

I'm confused about what the minimum gradient is for a waste pipe I'm planning to install. Looking at the table of minimum gradients in the approved document H it seems to give a minimum gradient of 1:80 (min. 1 WC) for 100 mm pipe as well as the minimum of 1:40 that seems to be the standard...