I lost my Leviton 6230M 30 mins timer installation sheet.

You parallel the contacts then either one or both will turn it on. Both have to be off for the fan to stop.

Leviton 6161 is shown on Leviton as 500 watt incandescent-only 4-level dimmer that cannot control a fan.
If this is a ceiling fan and light, then search for fan light dimmer, or fan control,

If this is bathroom fan-light installation, you are needing a countdown timer rated for both bulb and fan... which will require Neutral wire...
Different timer choices with manuals appear following link:
http://waterheatertimer.org/Countdown-timer-horsepower-ratings.html#Leviton

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

Is this new installation?
Sounds like timer is wired wrong.
Or you are replacing 3-way switch with the single-pole timer.
Copy following link for step-by-step wiring
http://waterheatertimer.org/How-to-wire-timers.html

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

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.

Leviton countdown timers have additional wire that powers internal electronics.
Leviton timers have red-black-white-green wires (or blue-black-white-green wires)

1) Regular single pole switch has 2 insulated wires. One of these wires is Hot from breaker, and the other goes to Load (fan)
2) Timer green wire connects to bare ground as you know.
3) Hot from breaker connects to timer black wire.
4) Load wire connects to timer red (or blue) wire.

5) Located in back of box are white wires that are twisted together and covered with wire nut.
These are Neutral wires. Connect timer white to these wires. This will power timer electronics.
6) If box does not have Neutral wires described above, then connect timer white to bare ground along with timer green wire.

7) Turn power ON and try timer countdown.
If timer does not work, then reverse timer red and timer black wire.

8) If box does not have neutral wires: Image on link below shows similar Intermatic timer:
Image applies ONLY when Neutral is not available.
http://waterheatertimer.org/images/EI210-wiring-full.jpg

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.

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.

Electrician test wiring before connecting anything.
First of all, you don't mention what type of switch was replaced.

1) Leviton 6230 countdown timer is made to replace single-pole light switch only.
Single pole is where 1 switch controls the Load (light fan motor)

Your wiring sounds like 3-way switch.
3-way is where 2 switches control same Load.
For example a hallway usually has 3-way switches.

To confirm. If old switch has 1 dark screw, 2 brass screws, and 1 green screw, then that is 3-way switch. Use Leviton LTB15, LTB30, LTB60, LTB02, LTB12 countdown timer for 3-way.
Smarthome sells product and shows .pdf manual
http://www.smarthome.com/4255/Leviton-LTB60-1LZ-4-Button-10-20-30-60-Minute-Countdown-Timer-Switch/p.aspx


2) If old switch has 2 brass screws and 1 green screw then that is single-pole switch.

3) If you are replacing single-pole switch, here are testing & wiring instructions for Leviton timer.
Remove device and separate wires for testing.
Use ordinary two wire tester.
Tape tester leads to wood sticks so hands are away from power.
Do not untwist wires that were twisted together before you started.
Turn on power.
Test each wire to bare ground wire.
Tester lights up on Hot wire. This wire will connect to timer black wire.
Now you know Hot wire.
Test Hot wire to each of the other wires, excluding bare ground wire.
Tester lights up on neutral. Timer white wire connects to Neutral wire.
If box does not contain Neutral wire, then timer white wire connects to bare ground.

Timer green wire connects to bare ground wire.
Timer red wire connects to wire going to Load.

The Leviton 6230 is a countdown timer with maximum time of 30 minutes.
The other times are 15minutes, 5minutes and 3minutes.
The timer has a manual override.
Push the bottom button and the timer works like a switch.

Leviton also make the 6260 countdown ... with 10-20-30-60minute times.

Hi there might be a couple of issues. The first one how old is your fan, if it is an older model motor maybe running down? Try setting your switch on the fan at high. Also the polarity of wiring at the switch or the fan might be swaped. This means the white and balck wires may not be in the right polarity.