Question about Intermatic Inc. ST01C Digital In-Wall Timer

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How do you access battery location? ST01 timer

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Open following link for ST01C battery, programming, wiring, instructions and manual.

Posted on Apr 03, 2011


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I can't even set the time! When I push the clock button I can advance the minutes, but then when I push the hour button the display goes off. Same thing happens if I start with changing the day of the...

If timer is not functioning... the battery needs to be changed or installed (if timer has battery, such as ST01, Ei500, EJ500 timers)
Or timer such as Aube or Honeywell or battery-operated timer mentioned above, or other possible timers not mentioned, has been exposed to freezing temperatures, and is not rated for low temperatures.
Or timer is defective.


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Mar 01, 2015 | Hardware & Accessories

1 Answer


Battery compartment is located below the buttons:
Use CR2 battery. Do not expose to freezing temps or battery fails within 20 days.

Timer has 1 year warranty.
Ofter, timer needs to be reset after battery change

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Feb 26, 2015 | Intermatic Hardware & Accessories

1 Answer

Does the Defiant Daylight Adjusting Indoor Digital Timer also uses a battery?

No battery.
This single-pole or 3-way, programmable or dawn-dusk timer is same as GE 15312 sun smart timer, and requires a neutral wire to power the electronics.
GE renamed all their wall timers, or sold their timer business to Defiant in year 2013-4.

If you want a timer with same capabilities, that uses a battery, and does not require neutral wire, then choose Intermatic ST01 or Ei600 timer


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Dec 05, 2014 | Hardware & Accessories

1 Answer

Can Woods model 59007 be used in house without
Ground wire is not essential, but neutral wire is
yes the red wire has to be connected to black wire that goes to load

If all you have are two black wires, then use battery operated timer like ST01 or Ei600


Sep 01, 2014 | Hardware & Accessories

1 Answer

I am unable to set the auto on and off

If reset does not restore functionality, then timer is bad, or in case of ST01 timer, the CR2 battery may need to be replaced.

1) Timer model and brand are unknown.
Copy following link for ST01 timer:

2) Add a comment and describe timer in detail, and add if this is new installation or older timer that stopped working.

Dec 26, 2012 | Hardware & Accessories

2 Answers

I want to replace the cr2 battery.Where is the battery compartment for the Intermatic model ST01 self adjusting wall switch timer?

The battery compartment is located behind the pull-down door
Pry open the door with small screwdriver of fingernail file

If the battery goes dead on the Intermatic ST01C or EJ500, the screen will not display.
When replacing battery, wipe clean all the terminal points for battery and battery carriage

If the new battery does not restore the screen, then the timers needs replacement.

Nov 03, 2010 | Electrical Supplies

2 Answers

How do I replace batteries in the ST01 series timer

The Intermatic ST01 uses a CR2 3 Volt-DC battery to operate the "click-clack" ON - OFF function of the timer.

In order to change the battery, simply pull down the flap just below small display screen. This is the manual switch that you can push to turn the timer on and off.

Just use your fingernail at the top of the door flap and pull down, it will open up and reveal another small tab. This is the battery holder/tray.

To open this, either use your fingernail or a small flat bladed screwdriver at the top to slide out the battery holder tray.

If you remjove and replace the battery within 30 seconds or less, you won't have to reprogram the time/day/date/year. Otherwise taking longer you'll have to reset the time and date feature of the timer.

Don't worry, the timer remembers your program ON - OFF cycles regardless of whether the battery is in the timer or not.

Hope you find this Very Helpful and best regards!

Aug 24, 2009 | Intermatic Hardware & Accessories

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