My GE smart digital timer keeps flashing I need help to rewire this

Wired wrong
http://waterheatertimer.org/How-to-wire-timers.html
http://waterheatertimer.org/How-to-wire-GE-15312-timer.html

Gene

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GE 15086 will not work for 3-way.
There are several timers that do... keep in mind that 3-way timers replace 1 or the other switch, but not both... and the remianing switch must be rewired slightly depending on which 3-way switch is replaced. Sounds confusing, but copy following links for exact wiring diagrams for the GE 15312 timer, and Intermatic ST01c 3-way timers: Easiest to wire is ST01C since it is battery-powered.
Another thing to remember, is that when the remaining switch is flipped in a 3-way timer circuit, it just reverses the timer programming, so dawn-dusk would become dusk-dawn etc.
These timers offer astronomic dawn-dusk function or 7-day programming.
http://waterheatertimer.org/How-to-wire-GE-15312-timer.html
http://waterheatertimer.org/ST01C-program.html#3-way
Gene
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If you need further help, I’m available over the phone at https://www.6ya.com/expert/gene_9f0ef4df2f9897e7

Open following link for GE 15071 instructions, image and manual
http://waterheatertimer.org/GE-timers-and-manuals.html#15071

GE 15071 is single pole only.

Open following link to see GE 15071 timer, on-line manual, and steps for wiring:
Link also shows timers that work for 3-way switch and include links to those timers and manuals:
http://waterheatertimer.org/GE-timers-and-manuals.html#15071

Add a comment for more free help.
Also take advantage of fixya phone service.
For a price, expert speaks with you over phone while you work on timer or any do-it-yourself project.
Fixya is always less expensive than a service call.

Timer wiring instructions shown on following page:
http://waterheatertimer.org/GE-timers-and-manuals.html#15071

You connected the white wire and red wire together, and that is why lights are clicking on-off.
I test timers and have done this intentionally during testing.
Follow instructions shown on link above, and GE timer will work correctly.
Same wiring applies to Tork, Swilight, Utilitec, Woods, Leviton, Intermatic non-battery operated timers.
Instructions are different for Aube, Brinks, UPM and Intermatic battery operated

I am guessing that you have digital in-wall timer GE 15071 or GE 15086

To identify timer for sure, see images at following link:
http://waterheatertimer.org/GE-timers-and-manuals.html#15071

Manual for 15086
http://waterheatertimer.org/pdf/GE-15086-Manual.pdf

If this is new timer, the problem could be a couple things.
1) Circuit has electrical problem that is affecting timer electronics.
Use circuit analyzer from Home Depot electric department and test any receptacle on same circuit breaker as timer.
2) event1 ON was programmed but event1 OFF was not programmed. To review events, press Prog button once to see event1 ON and press Prog button again to see event1 OFF. When review is complete, press clock key to return to current time.
3) event1 ON and event1 OFF are programmed with conflicting day schedules
4) event1 and event7 have conflicting schedules

If this is new or old timer:
5) Timer needs to be reset because of internal glitch. Press and hold reset button for a moment and timer display will start flashing 12:00 am MO
6) These timers can go bad any time. I test timers and 4-6% arrive defective, and most quit after couple years, but some can last quite a while. This is why I suggest using a circuit analyzer to check if circuit is causing difficulties.

http://www.manualsdir.com/manuals/400481/ge-in-wall-15086-ge-smart-digital-timer.html

The timer is wired incorrectly.

ON the GE timer and Utilitec timer: The red and black wires are reversed.

On the Intermatic ST01C

Sounds like you connected white wire incorrectly, or are trying to replace 3-way switch.
GE 15071 and 15086 are for single-pole switch replacement only, and will not work for 3-way.
Open following page for correct wiring of GE in-wall timers, and for list of timers used for 3-way.
http://waterheatertimer.org/GE-timers-and-manuals.html#15071

If you have different timer, add a comment with in-focus photo of your timer for correct identification and possible assistance.
http://www.fixya.com/support/r6568559-post_photograph_fixya_questions_answers

Add a comment for more free help

Also take advantage of fixya expert assistance live.
For a price, expert works with you while you work on timer or any do-it-yourself project.
Fixya is always less expensive than a service call.

First, the timer has to rated for 3-way application.
Not every timer works for 3-way.
Open following link for some timers that work for 3-way application.
http://waterheatertimer.org/GE-timers-and-manuals.html#15071

Next thing is to read instruction manual carefully.
Since 3-way switches come in pairs, the timer replaces one of the switches, and then the other switch remains.
Some timers can replace either switch, and some timers can only replace the switch that receives hot from breaker.
In all cases, the remaining 3-way switch must be rewired to accommodate how the timer works.