I've a Triton thermostatic mixer that's only been used three times in six years and can only get cold water from it. The water flow from the valve is constant, even when turning the temperature control from cold to hot. I've removed it from the wall and both hot and cold feeds are fine so it's not an airlock. If I blow into the hot water side of the valve it's totally blocked.
Anyone have any thoughts what the problem could be?
Roly