Peugeot 206 power steering gone stiff

Most common / usual fault on that car is pump .

is the pump pulley actually turning,are you getting any noise when the steering is turned?when the pump is worn they are normally noisey,check all your pipes and make sure there is no damage,could be a blockage or restriction in one of the pipes,try draining the fluid out and topping up with new fluid and then bleed the air out by turning steering left to right untill air is out

Mine was the steering dropshaft that had seized.One of of the universal joints had given up.The dropshaft term is how the garage referred to it.Basically,it was the connection between steering wheel and steering rack.Didn't look a major dismantling task and I think they did it in 1hr.

Good shout by " John Wait ", every chance that iy could be a mechanical fault , as he mentions , rather than hydraulic .Happens on a lot of other cars like Ford etc. with same type of steering set up .