20 Most Recent Leviton Timer Switch 5-10-15-30 Minutes, 4 Buttons and OFF, Single Pole, Li Questions & Answers

The white wire is used to power electronics inside timer:

Single pole switch has two insulated wires.
Remove both insulated wires from switch.

Timer black connects to one of the insulated switch wires, or to Hot wire from breaker
Timer red connects to the other insulated switch wire, or to Load wire going to fan, light, motor.
Timer white connects to Neutral wire from breaker box. Neutrals are white wires that are twisted together and pushed to back of box.
If box does not have Neutral wires, then connect timer white wire to bare ground wire.
Timer green connects to bare ground.

Turn power on, and check if timer is working. If timer is not working, then reverse timer black and timer red wires.
This wiring information has been tested and is accurate.
If timer does not function correctly with correct wiring, then move timer to another location to see if timer is defective, if timer does not work on specific Load, then noise or interference on line can be suspect. Also check ratings for timer and compare with Load ratings.

If you have countdown timer connected to whole house motor/fan, then horsepower rating is important consideration. If timer is rated 1/6 HP and whole house fan is 1/2 HP, then timer will not work.
http://waterheatertimer.org/Countdown-timer-horsepower-ratings.html

Your timer is not desinchronized and can not be set as it is not digital (programmed) type of timer. It is "Hard Wired", that's why the problem is hardware.

Probably it is a dry condenser problem, or a quarz cristal if it's digitalised.

I think that it is rather electrolyte condenser.
If you can not repair it by yourself, take it to a friend it should not be more  expensive than a bottle two of beer.

https://www.youtube.com/watch?v=FdwvDJGrbK8

The timer lets you adjust the preset astronomic time for your area.
This is because actual local times vary.
If the preset time for dusk is 8:00pm and you add 12 minutes, then the timer will turn off-or-on at 8:12.
And then you can change the preset time for dawn by adding or subtracting.

If this is not what exactly you are asking, then set your timer and see what happens, and then add a comment with your findings.
Open following link to download on-line manual
http://waterheatertimer.org/Leviton-timers.html

Add a comment with your experience so others with same-similar problem can benefit.

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.

The Leviton LTB30 20 amp timer has a known design flaw. It has a 1 microfarad electrolytic capacitor installed against a screaming hot resistor. Cooks and dries out the cap even when not in use. 50% failure rate in my initial install of 4 units. Pull it apart and replace the electrolytic with a ceramic cap and it will be fine. I have two of many that have already failed. Poor design of voltage regulation and poor layout of cheap components that self destruct. Design is not half baked, it is fully baked, lol. Can be fixed though, so not all bad...

Leviton timer manuals appear following link: http://waterheatertimer.org/Leviton-timers-and-manuals.html

replace it, they are not expensive. They are a disposable item.

The following link has manuals for Leviton timers: http://waterheatertimer.org/Leviton-timers.html

Dear Dean, Generally speaking, black indicated "hot", like the color of "burnt". White indicates the color of ground. ( ice or snow) One of your black wires should be "incoming" ( that means have electricity in it NOW", and the other one would go to where the item was that was timed. After you find which wire is "hot", the other black wire goes to the opposite side of the switch. You may need to reverse the black wires if it is wired backwards to the ":on" & "off" readings. The ground would be the white wire. If you have a green screw, the ground (white) could go there.

1) To test the timer, put it on another Load, for example a light.

2) Also you can test your wires.
Take wire nut off Black-black connection and test to bare ground >>> tester should light up.
Next take wire nut off Black-blue connection and test to bare ground >>> tester should NOT light up until push button is activated and countdown begins.

3) Another thing to try is reversing the blue and black wire, just to double check your wiring.

• When the switch is ON, the light operates in dusk-to-dawn mode. In this mode, the light automatically turns on at sunset and turns off at sunrise. When the switch is off, the light stays off.

motor or gear failure