If pump does not work then what should i priory

Need more information to solve your problem.

Does the pump come on (do you hear it?) but no water comes out when you make coffee?

When you select Hot Water and open the steam valve, does the pump run and does water come out the steam valve?

If you hear the pump running but no water is coming out - then it could either be that the pump needs to be primed. In that case you would select Hot Water and open the steam valve all the way and let water run out the wand for a minute or two.

If the steam wand delivers water but you don't get any water when you brew coffee, then either the coffee is ground so fine that the water cannot go through the coffee grinds OR the filter disc may be plugged up. Try grinding coarser and try removing the filter disc and cleaning it with a toothbrush - hold the disc to the light and verify that you can see through all the tiny holes.

If it pumps water for coffee but you don't get water out the steam pipe, then the steam wand may be plugged with hardened milk - in that case remove the plastic frother and soak it and clean it. Also use a bent paperclip to clean the hole in the end of the chrome steam pipe.

If the pump doesn't run at all and you don't hear any pump noises ever - then either the pump has failed or has a loose wire.