The fact that you are getting no error message indicates that programming is not right, or there is electrical short between timer and sprinkler solenoid:
With all digital timers, it is important to clear memory before starting, and then double-check there are no conflicts in programming.
Page 22-23 of the manual has quick-check procedure for identifying shorts that would cause problems.
Check outlet with circuit analyzer to check for correct polarity and grounding.
Google search Hunter Pro C manual to download searchable pdf manual
Keep in mind also that digital timers are susceptible to line noise, and power surge. Simple power outage can disable digital timer. There are no replacement parts.
That's why I recommend good old fashion 14-day repeat-cycle mechanical sprinkler timer with fewer features, but replaceable parts.
For example T8845PV with 24Volt ac output
http://waterheatertimer.org/Intermatic-trippers-and-parts.html#sprinkler
http://waterheatertimer.org/How-to-wire-Intermatic-sprinkler-timers.html
http://waterheatertimer.org/How-to-wire-Intermatic-sprinkler-timers.html#T8845PV
If you need further help, I’m available over the phone at
https://www.6ya.com/expert/gene_9f0ef4df2f9897e7
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