Wiring of the 2-5-10-15 timer to a jucuzee bath tub it has three wires black blue green. Thanks. Terry.

This particular timer replaces single-pole switch only, and does not require neutral wire, and is rated for incandescent light bulbs up to 500 watts total.
http://waterheatertimer.org/GE-timers-and-manuals.html#15312
The green wire connects to bare ground wire.
The switch you are replacing has two wires. Connect timer wires to either switch wire. Turn power ON. Press timer on-off button. If lights turn on-off, then timer is wired correctly, if lights do not turn on-off, then reverse the black and blue wire.

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You are asking about GE 15312 timer.
Open following link for exact single-pole wiring illustrations:
http://waterheatertimer.org/How-to-wire-GE-15312-timer.html


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You posted under ST01C and are wiring timer to replace 3-way switch.
Open following link for specific illustrations:
http://waterheatertimer.org/ST01C-program.html#ST01C
http://waterheatertimer.org/pdf/ST01C-explanation.rtf

1) The timer replaces one of the 3-way switches. The other 3-way switch remains, but must be rewired.
2) The timer must replace the 3-way switch that receives power from breaker box. It cannot replace the other 3-way switch. This is because the timer Black wire must always receive power.
3) The timer blue wire must connect to Load (light)
4) The ST01C red wire is only used when wiring for 3-way.
5) When the red wire and blue wire are connected together, they reverse the timer program. When timer red and blue are disconnected, the timer resumes programming. Connecting and disconnecting the red and blue wires is how the timer mimics 3-way operation.
6) The remaining 3-way switch must be wired so it will connect and disconnect the red and blue timer wires. So the remaining 3-way switch has to be rewired to meet specific timer wiring.

Open following link to identify timer:
http://waterheatertimer.org/Countdown-timer-horsepower-ratings.html#6230

Leviton 6200 series timer replaces single-pole switch. Will not work for 3-way or 4-way applications.
Timer has 4 wires: Blue, Black, White, Green
Timer Green to bare copper wire.
Timer Black to Hot wire from breaker.
Timer White to Neutral wire from breaker. Neutral wires are white wires that are twisted together and covered with wire nut pushed to back of box. If box does not have neutrals, connect Timer white to bare ground wire.
Timer Blue to Load wire.
If timer does not work, reverse Timer Black and Timer Blue.

Countdown timers are made to work with bath fans.
Leviton countdown timers are stout product with 1HP rating.
http://waterheatertimer.org/Countdown-timer-horsepower-ratings.html#6200

It sounds like timer is bad.
Wiring sounds good. Make sure you don't have Load and Line wires reversed. Try reversing Load-Line wires and see what happens.
Another thing that affects electronic timers is line noise/interference. If replacement timer does same thing, then noise is suspect. Try timer on another circuit without fan. Try another brand timer. Update to newer LTB60 Leviton timer. Use cheap circuit tester from home center to check outlet on same circuit.

Open following link to see clear drawing and instructions for wiring ST01C timer.
Page also has EZ programming steps:
http://waterheatertimer.org/ST01C-program.html#ST01C

Red wire is capped.
Blue wire goes to Load (wire to sconces)
Black wire connects to Line wire (wire from breaker)
Green wire goes to ground.
If you are uncertain about Load and Line wires, just connect them either way, turn power ON, push on-off button, it lights don't come on, then reverse wires.
I have tested this timer, and information here is correct.
Don't forget to install CR2 battery, otherwise display will not show.

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You are replacing a single-pole switch that has two wires.

You posted under UPM timer.
But UPM timers have a red wire instead of a blue wire, so you have different brand.

Some GE programmable timers and some Leviton timers have a blue wire.
Here are instructions:
-Green wire goes to bare ground wire.

-Timer black wire goes to black wire
-Timer blue wire goes to white wire.

-Located in back of electric box are white wires twisted together and covered with wire nut. These are neutral wires. Timer white wire connects to these wires. This will power electronics inside the timer.
-If your box does not have white neutral wires described above, then connect timer white wire to bare ground wire along with timer green wire.
-Turn power ON, and push on-off button. If timer works, then it is wired correctly.
- If timer doesn't work, then reverse Timer blue and Timer black wires.
- If lights blink on-and-off, then you connected white wire incorrectly, review wiring shown above.

If your box does not have neutral wires or bare ground wire as described above, then buy Walmart.s Brinks 46-1022 or Intermatic ST01C or Intermatic EJ500 or Aube T1032. These timers do not need neutral or bare ground wire.

What timer are you installing?

Intermatic battery-operated timer with red, blue, black and green
Green connects to bare ground
Red is capped off.
Blue connects to one wire
Black connects to other wire
Push on-off button: if light comes on, timer wiring is correct.
If light does not come on, then reverse blue and black wires.

Other in-wall timers except Aube have red, black, white and green
Green goes to bare ground
Red connects to one wire
Black connects to other wire.
White: in back of electrical box are white wires twisted together and covered with wire nut. Connect white white to these other white wires.
If box does not have white wires described above, then connect white wire to bare ground along with green wire.
Push on-off or override switch: if light comes on, timer wiring is correct.
If light does not come on, then reverse red and black wires.

That is a three way timer. There is no wire that the white wire gets hooked to. The black is the hot, the blue sends power to the device, and the red goes to a switch that connects it to the blue wire essentially. Here is a PDF of the directions, including wiring diagrams.

http://www.intermatic.com/~/media/files/intermatic/products/instructions/timers/ei600c%20-%20english.ashx