I installed a Woods 59720 timer switch to control a small bathroom fan. First time I turned it on 5min cycle it worked fine. Now, it runs only 10-15 seconds, then turns off. Set for maximum 30 minutes, it cycles down each stop for 10/15 sec, then off. Any suggestions ?? [email protected]

Woods has 1 year warranty from CCI
http://waterheatertimer.org/Woods-timers-and-manuals.html
http://waterheatertimer.org/Countdown-timer-horsepower-ratings.html

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

Usually when there is intermitent power like that there is a bad connection under one of the wirenuts. Remove the timers, untwist all wirenuts and start over.

There are no repairs for electronic wall timers.
Timers have 1 year warranty against defects in workmanship. This sounds like the case here.

Try timer on different circuit and see if same malfunction appears.

Woods is rated for 1/4 HP and will handle bath fan, so load does not sound like a problem.
Timer worked before, so wiring is correct.
Power outages can knock out timers when the power turns on again and timer is exposed to surge.

View countdown timers:
Electronic Leviton 6200 series and Leviton LTB series are more robust than Woods.
Mechanical rotary-type timers have no electronics, and last many years without problems.
Buy locally: GE countdown timers are sold at Home Depot. Advantage of store-bought timer is hassle-free warranty: buy new timer and return defect timer in new package.
http://waterheatertimer.org/Countdown-timer-horsepower-ratings.html

Take a moment and vote on answer:
And 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.

You have new 59017 single-pole in-wall 24-hour timer with tripper pins located on dial.
Timer is heavy duty and will handle up to 2500Watts 1 HP, including anything typically controlled by 15-20Amp light switch: incandescent, florescent, CFL, motor, pump, AC, whole house fan, etc.
http://waterheatertimer.org/images/Woods-59017-mechanical-timer-300.jpg

When timer is wired correctly, timer dial rotates no matter which position slide switch is set to.
Your dial rotated correctly and turned lamp ON, and rotated correctly until lamp turned OFF, and then stopped rotating.
This implies loss of power.
Check circuit breaker.
Check for loose wire on timer installation.
If wiring checks out, then timer is suspect. Replace different switch with suspect timer, and see if timer works on different Load.
http://waterheatertimer.org/images/GE-15070-wiring-1-500.jpg
http://waterheatertimer.org/Woods-timers-and-manuals.html#59017

It sounds like you have mechanical push-button type timer.
I need more information to avoid guessing which timer is best for your situation.

I'm not sure what a 3-wire system is?
Add a comment
1) How many switches control same fan
2) What color wires inside box.

Is this
3) low-horsepower bathroom fan?
4) other fan, for example: higher horsepower attic fan, 3/4 horsepower industrial kitchen fan, or 1-horsepower whole house fan?
5) Is this your home or is fan for continual commercial use?

6) Is this a countdown timer that turns fan OFF automatically after 60 minutes?
7) Or what kind of timer are you looking for.

Open following link for list of home-use countdown timers and horsepower ratings of countdown timers.
http://waterheatertimer.org/Countdown-timer-horsepower-ratings.html

Spring-wound timers do not require extra Neutral wire, and can control 1 HP whole-house fan.
The push-button timers each require Neutral wire to run electronics inside timer, and they range from 1/6 HP to 3/4 HP which will work for any bathroom fan.

If you cannot give required information for more free help, then request fixya interactive answer and pay fixya expert to ask same questions while expert supplies you with immediate information.

On some Bathroom extractor fans there is a setting for the amount of time you want the fan to stay on after you turn off the switch, the setting dial is normally at the back of the fan so you need to take the fan down from the ceiling making sure the fan is electrically isolated.

Sure George.

These in-wall timers have extra wire to operate the electronics located inside timer.
You said your old switch has 3 wires.
The new timer can only replace on-off switch that has 2 brass screws and a green screw.
If old switch has 2 brass screws and a dark screw, that is a 3-way switch.
Typically a 3-way switch is found at both ends of hallway.
The Woods 95008 countdown timer is not made to replace 3-way:
http://waterheatertimer.org/Woods-timers-and-manuals.html#59000

Here's what to do:
1) Switch has 2 wires (plus bare ground wire). Take switch wires and connect them to timer-black-wire and timer-red-wire. Choose either one for now.
2) In back of electric box are white wires twisted together and covered with wire nut. Connect timer-white to these wires. This wire will power timer electronics.
3) If electric box does not have white wires described above, then connect timer-white to bare ground, along with timer-green wire.
4) Turn on electricity, and push override button located below the OFF button. If lights come on, timer is wired correctly. If lights do not come on, then reverse timer-red and timer-black wires.

Add a comment if your need more assistance.

I have not heard of Woods 16ULD.
Woods timers sometimes have more than 1 model number for same timer, depending on who packaged and sold timer.

You posted under Woods plug-in timer with segments around edge of dial.
If this is not your timer, add a comment.

Also see lost of Woods timers where you might recognized photo of your model:
http://waterheatertimer.org/Woods-timers-and-manuals.html

To program Woods timers with segments:
Rotate dial until current time lines up with arrowhead located on inner dial
Segments around outer edge of dial lift up.
Use fingernail, or small screwdriver to lift up segments when you want timer to turn OFF.
Leave segments down for times you want timer ON.
Slide switch located on top of timer is manual override.
Move switch to ON position when you want lights ON full time.
Move switch other direction for timer program to operate.
Timer dial rotates with passing time.
Program repeats each 24 hours.
Table lamp must be turned ON for timer to function.
If timer doesn't work, check receptacle for power, check that lamp is turned ON, and check that bulb is good.

Woods 59013 59017 59018 59720 59028 etc wall timers are not made for 3-way application. They replace a simple on-off switch.

Atube T1032-3W programmable timer shows it can replace 3-way switch.
See manual
Smarthome

Intermatic ST01C & EJ500 programmable times can replace 3-way switch. Look at diagrams carefully. Circuit is limited to 100' distance because of battery.
See wiring diagram
Aplus

Lutron makes several 3-way countdown timers that turn on light for certain length of time and then turn off light

Tip for 3-way switch replacement: Mark wire that connects to dark-colored screw. This is called the 'common' wire.
Depending on location of switch, the 'common' wire either goes to Load (lights) or it comes from breaker box as Hot wire.