pool timer issue

[rhubbard]

When my pool timer goes on, the breaker trips. It does not trip when it automatically goes off in the evening.
It was working until yesterday. We had the same problem last year, but this year, it was working fine until 2 days ago.

 

[1poolman1]

When my pool timer goes on, the breaker trips. It does not trip when it automatically goes off in the evening.
It was working until yesterday. We had the same problem last year, but this year, it was working fine until 2 days ago.

Make of timer? GFCI breaker? Type of pump? Picture?

 

[sktn77a]

Could be the timer, the breaker or the pump. Not sure what else to tell you.