Thanks for the reply.....and your patience with this....
Power in on
Summer timer is off
I've stuck nothing in the line
no sucking noise
ozonator is now disconnected and removed
My belief is that it's a bad/weak circ. pump even though the waters hot...I was hoping for a less $ solution because know I have to replace the ozonator... I took it apart and the fuse was totally corroded off and the contact with the ozone tube was almost rusted off...I'm going to swap out the circ. pump with a replacement Laing 5000 I bought previously when I thought the pump was bad...the replacement pump seems a little sketchy to me, is there a better replacement than the smaller Laing silent-flo-5000???? Thanks again, Jim