Possibly
So what your saying is the headlight doesnt work unless its on high beam? This makes sense as the parkers are a separate globe and the headlight bulb is dual filament so if you low beam has blown high beam will still work.
quick way to check is that if the other head light is working properly then swap the globes over. If it works properly in the other side too then its the globe.
Other issues could be in the indicator stalk, sometimes the connections need a clean up/possible adjustment.