How do I reset the intermatic EI400 light timer

http://waterheatertimer.org/Intermatic-timers-and-manuals.html#Ei400

http://waterheatertimer.org/Countdown-timer-horsepower-ratings.html#Ei

gene

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Ei400 programmable countdown timer... CR2 battery
http://waterheatertimer.org/ST01C-program.html#battery

http://waterheatertimer.org/Countdown-timer-horsepower-ratings.html

Gene

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

Following link has manual for Intermatic ET8100 series
Choose astronomic dawn-dusk timer -or- 7-day programming
http://waterheatertimer.org/Intermatic-ET-series-timers-and-manuals.html#ET8000

be sure to install two AAA batteries in compartment located on front just below the buttons.
Also reset the timer prior to programming ... and this will clear any conflicts or prior programming.
Timer default voltage is 120 volt AC. Choose 208-240-277 volt by moving selector switch located on back of timer.

Gene

Water Heater Timers Save Money

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

Is this a newly purchased timer?
ET170 series has standard 1 year limited warranty, and is discontinued timer replaced by 7-day, 1 and 2 channel ET1700 series.
The manual shows troubleshoot section:
http://www.intermatic.com/~/media/files/intermatic/products/instructions/timers/et175c%20-%20english.ashx

Last step restoration for electronic timers is to replace battery and push in reset button.
Battery compartment is located below buttons.
Compartment slides down and outward and holds AA battery.
If functionality is not restored, then timer has gone bad.

Intermatic customer service:
http://www.intermatic.com/customer%20service.aspx

You posted under Intermatic PB300 series timer module.
http://waterheatertimer.org/pdf/Catelog-146-PB300.pdf
http://waterheatertimer.org/Intermatic-trippers-and-parts.html#FM

Failure after battery replacement is common complaint about timers.
Chance to restore functionality is to reset timer.
Reset PB300 timer using round reset button on far right side.
If functionality is not restored, then timer has gone bad.
Order new timer module using information on back of timer, and take photo of wiring so new timer can be wired easily.

Timer is not identified. Battery-operate timers wire differently than timers that require neutral wire.
http://waterheatertimer.org/Intermatic-timers-and-manuals.html

For 4-wire battery-operated Intermatic EJ500, ST01C, and Ei600, Ei400 wiring:
http://waterheatertimer.org/ST01C-program.html#ST01C

For 4-wire Intermatic Ei200 series, KM-series, Ei500 that require neutral wire
http://waterheatertimer.org/Programmable.html#wire

Add a comment with model number for more specific information

If display is scrambled, reset timer: Push reset button while holding down enter button.
If display doesn't show, check AAA batteries.

If timer still doesn't work, then Contact Intermatic.
8000 series comes with 1 year limited warranty
https://parts.intermatic.com/
Intermatic does not show replacement memory board for ET8000 series

Upvote the help.
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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.

Intermatic makes heavy duty Ei400 series 1HP 120V or 240V countdown timer that can be wired for single-pole and 3-way.
Open following link to identify Ei400 timer and download manual:
http://waterheatertimer.org/Countdown-timer-horsepower-ratings.html#Ei

Coundownt timers are used to control fans and lights that need to run certain length of time, and then turn off. For example bathroom fan or whole house attic fan

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You posted under Intermatic battery-operated in-wall timer.
That means you have EJ500, ST01C, EI600 timer or EI400.
http://waterheatertimer.org/ST01C-program.html
http://waterheatertimer.org/Flipdown.html

1) No-op means fatal operation error, and timer needs to be replaced.

2) Since fixya customers only like good news:
Intermatic has 1 year limited warranty on these timers if you can demonstrate proof of purchase.
As of right now, April 2011 Intermatic website is closed weekends.
https://parts.intermatic.com/

3) You can try re-seting timer by holding down on-off and then pushing reset button momentarily. Keep holding on-off button until display changes, then release on-off. Then reprogram timer.
Instructions show that resetting timer is last-resort troubleshoot, and if timer does not function afterward, then timer has fatal malfunction.

4) I read where no-op can be fixed by opening timer and adding oil to a gear, but I cannot confirm this and am not going to take apart my test timers.
Since your timer is not working, please take it apart and then add a comment to this thread to confirm or repeal the oil-gear suggestion. I would very much like to know this information, and you can add a photo to your comment showing others how to do it.
http://www.fixya.com/support/r6568559-post_photograph_fixya_questions_answers

Add a comment for more free help

5) Pay: 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.

1) GE 15086 is not a 3-way timer.
GE programmable timers are for single-pole switch replacement only. I have tested this timer, and own several GE timers, and many other brands.

2) Open following link to identify timers that work for 3-way switching.
http://waterheatertimer.org/GE-timers-and-manuals.html#15071

3) After buying correct timer, then you need to review wiring diagrams carefully because the timer replaces 1 of the 3-way switches, but other 3-way switch has to be wired exactly right to match your brand of timer.

4) Links on page above show manuals for each of the 3-way timers. Compare wiring for each timer with Intermatic wiring that you are replacing, because Intermatic is wired differently than Aube.

5) Or just buy another Intermatic ST01C or EJ500 or EI400, etc, and wiring with change out 1 for 1.

6) 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.