I have voltage to a Hayward Tristar pool pump...won't run!

http://www.hayward-pool.com.au/pdf/manuals/TriStar.pdf

1) Not likely the timer is problem, unless there was fire or overheating in timer box. Use nose and eyes to inspect for signs of high heat.

2) Eliminate timer as suspect:
Move wires on timer to test if timer relays have gone bad.
Move terminal 4 to terminal 3
Move terminal 2 to terminal 1
http://waterheatertimer.org/How-to-wire-T104-Intermatic-timer.html#T104

3) Check watt rating of Hayward pump, and voltage.
1Hp motor at 240Volt draws 8 amp, and can draw 6 to 8 times that amount when starting. Up to 100 feet, should be at least 12 gauge wire and double-pole 20 amp breaker. Over 100 feet, 10 gauge wire and 30 amp double-pole breaker is best.
http://waterheatertimer.org/Color-codewire.html#motor

4) Intermatic T104 240V timer is rated 40 amps
Can safely handle 1 Hp motor without nearing heat-rating capacity of timer

5) Make sure the motor is wired correctly for 240Volts.
If motor is wired for 120, and 240 is applied, then tripped breaker can result.

If you need further help, I’m available over the phone at https://www.6ya.com/expert/gene_9f0ef4df2f9897e7

Water sprayed on the pump occasionally shouldn't hurt it but it might cause a ground fault circuit interupter (GFCI) to trip. If you turn on the pump and literally nothing happens then most likely the the GFCI has tripped. If it hums then this is a different issue. If you have a volt meter you can open the timer box and check whether power is available to the timer. If no power is available in the timer then it confirms that the pump is probably ok. Checking your circuit breaker panel for a tripped breaker or finding a tripped GFCI then either one can be reset and your pump will probably run without a problem.

I hope this helps.

short in motor check power going to motor make sure it in the rite setting 110v or 230v check for lose wires

faulty start/run capacitor

SOUNDS LIKE YOU HAVE A BAD BREAKER.. THIS IS A GRAVY FIX.. I SEE A VOLT METER IN YOUR FUTURE YES ITS ONE TO CHECK 230 V AC .. YOU LOCAL CAR PARTS STORE HAS THESE CHEAP .. ASK HOW TO USE IT AND YOUR OFF.. WHAT WE ARE LOOKING FOR IS 230 240v IN THAT RANGE ON THE 2 WIRES ON THE BACK OF THE MOTOR... OR EVEN THE TIMER.. NO?.....BREAKER NO? REPLACE BREAKER... BREAKER YES.. CHECK TIMER CONTACTS .. don't forget to prime your pump after a repair !!!!!!!!.. did i help ? well then please vote.. I got to get back to fix'n the pool pumps here in Florida ... Jay .. PPRG