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sorry to be a pain - but what is a diverter?

The heating is now staying on downstairs, as long as I don't turn the upstairs rads on.

I have a potterton Puma combi boiler around 5 years old. Since the guarantee ran out the kitchen rad has not worked at all - checked TRV - all ok. Recently the rads have been going off if taps in bathroom are not turned off really tightly. But tightening them has turned rads back on. When a...