Take the bonnet off and unplug the hose to the jets and see if water is getting to the jets.
If it is, then the jets are obviously duff and these are relatively easy to replace and pretty cheap too (they're just over a fiver each I believe).
If no water is getting to the end of the hose, then you've either got a leak (look for water dripping from the undertray) or the pump is defective.
Cheers,
Mike