After a power outage how to reset timer correctly

It sounds like the timer may have been affected by the power outage and is not functioning properly. If the timer is a mechanical timer, you can try resetting the time on the timer and check if the trippers (ON/OFF pointers) are set to the correct time and are not loose. If the trippers are loose, then they could slip and cause issues with the pump turning on/off at the correct times. You can also try lubricating the manual on/off switch with a lubricant such as WD-40. If the timer is a digital timer, you can try replacing the battery to see if that resolves the issue.

If there was a brief power outage and your light timer is not working, there are a few steps you can take to troubleshoot the issue:

1. Check the timer settings: Make sure that the timer is set correctly and that the time and program settings are accurate. If the timer has lost power, it may have reset and will need to be reprogrammed.
2. Check the power source: Ensure that the timer is receiving power by checking the outlet or circuit breaker that it is plugged into. If the outlet or breaker has tripped, reset it and try again.
3. Check the timer battery: If your timer has a battery backup, check the battery to make sure it is still functional. If the battery has died, replace it with a new one.
4. Reset the timer: If none of the above steps have worked, try resetting the timer to its default settings. Refer to the user manual for instructions on how to reset the timer.

If the above steps do not resolve the issue, it's possible that the timer has been damaged due to the power outage. In this case, you may need to replace the timer or seek the assistance of an electrician to diagnose and repair the problem.

if it has been reset and reprogrammed properly, there is a good chance the power outage damaged the unit.

Timers are frequently damaged and need to be reset after power surge caused by outage ... A battery-operated timer would perform correctly in a loadshedding environment http://waterheatertimer.org/Programmable.html#st01

Replace battery?
Bad timer?
Power outage?
http://waterheatertimer.org/How-to-troubleshoot-timers.html

Gene

Water Heater Timers Save Money

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Some timers have capacitor carryover for power outage.
This means timer does not need to be reset after power outage

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Why did fuse blow?
Is timer under-rated for load on line?
Do wire size and breaker size match?
EJ500 is rated incandescent-only with maximum 500 watts, with temp range from 32 to 104 F, maximum distance 100' from load, and timer has 1 year warranty against defects.
http://waterheatertimer.org/Intermatic-timers-and-manuals.html
http://waterheatertimer.org/Color-codewire.html

Try resetting timer.
This will delete both programs and current time settings.
Hold down on-off button, and press and release reset button.
Keep holding on-off button until display changes, and 12:00 is flashing.

If timer will not reset, try changing battery.

Simple power outages, and blown fuses can cause power surge that will knock out timers. This is a common problem, and resetting timer can usually solve problem.
Timers like outdoor power pack, and analog plug-in timers do not have reset button and can easily fail after ordinary power outage.

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Open following link for Utilitec timer manual:
http://waterheatertimer.org/Program-wire-Utilitec-LW60418.html

This timer should have a back-up capacitor so that programming is kept in memory during power outage.
Power outage is known cause of timer failure. When power turns on, the surge knocks out electronics.
People writing to fixya report electronic timers and electronic water heater controls stop working after power outage. Probably many other electronic devices are affected too, but that would be out of my specialty.
Troubleshoot says 'in case of operational failure, press reset button to clear all settings and restart.'
If timer has failed, buy another from Lowes and return defect in new package.

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Question posted under Intermatic ST01C, but Timer is not 100% identified since ST01C is battery powered, and should not lose programming or stop working with ordinary power outage.
Most digital timers have a battery or capacitor back-up for power outage.
Add a comment with description of timer buttons, or open link below to see most brands of in-wall timer.

Open following link for to identify Intermatic ST01C and Ei600 and download instructions:
http://waterheatertimer.org/ST01C-program.html#battery
ST01C timer has a battery backup. Power outage will NOT cause battery-powered display to fail, but power outage and power surge can cause any electronic timer to fail.
So either the battery went dead, or power surge ruined timer, or you don't have ST01C timer.

If ST01c display is not showing, then replace battery and then reprogram current time -or- manually re-set timer and then reprogram timer.

8100-9045 is rated for 45 watts.
That's two 20 watt bulbs, or three 15 watt bulbs.

Power outage carryover: Contact Malibu directly since there is conflicting information on Malibu site:
http://malibulights.com/customer_service/contact_us.aspx

8100-9045-01 45-watt power pack page on the support tab says 'loss of power will stop timer.'
And then mentions tripper.
http://www.malibulights.com/products/transformers/details.aspx?item=8100-9045-01
http://malibulights.com/products/transformers.aspx

However other information on Malibu wesite contradicts power-outage information and shows 8100 series timer is electronic and is controlled by photoeye, and that timer has no tripper.
http://waterheatertimer.org/images/Malibu-8100-series-400.jpg
As a general rule with electronic timers, there is battery or capacitor carryover.