2000 Jaguar XJR Windsheild Wipers

It is raining very hard in Northern CA and I used my wipers on high for I'd say maybe 20 minutes as I ran an errand.

I parked the car turned it off and after I came out to go home about 1 hour later the wipers would not work.

If I press the button on the end of the control arm the water shoots out, but the wipers do not move. What Happened?

I did have the fuses checked, and the mechanic said they were okay.

What else can I check or do to try and resolve this problem.