Question about Intermatic Inc. ST01C Digital In-Wall Timer

2 Answers

I have a wall switch and two outside ligthts. there appers to be two black wires to old switch. Timer has white, black, red, and green. I hagve tried all wiring scemes and get lights to stay and not turn off or not turn on at all but can not turn on or off. What is the problem and how should it be wired? Help!!!!!

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2 Answers

You posted under the ST01C timer.
ST01C has black, red and blue wires, and has a battery to run the clock.

You have black, white, red and green.
So your timer has an electronic clock and no battery.

Let's go through the wires one at a time.
You can add a comment and I will help further if needed.

Old switch has 2 black wires.
One of these wire is black-Hot
The other wire is black-to-Load (load is your light, fan, motor)

Black-Hot connects to timer-black wire
Black-to-Load connects to timer-red wire
NOW ... if these wires are reversed, the timer will not operate, so simply reverse the wires.

There are two wires to go:
Timer-green wire goes to bare copper wire.
Timer-white wire is the wire that runs the clock inside the timer. This is just like plugging in your alarm clock so the clock runs.

The timer-white wire connects to the other white wires located inside the box.
These white wires are usually twisted together and covered with a wire nut.
So untwist the wire nut and add the timer-white wire to these wires.
What if your box does not have these other white wires?
Then in that case, connect the timer-white wire to the bare copper and the clock will run.

I have a wall switch - geno_3245_14.jpg

Posted on Nov 07, 2010

Testimonial: "thanks very much, I will try again. Could I have blown the timer if hooked up the wrong way?"

  • Anonymous Nov 07, 2010

    I tested most of the timers here in my office. I hooked up the wires all kinds of ways and shorted them out. When they short out, they pop loudly ... and then I pushed the reset button and the timer was good to go again. Each of the timers acts a bit differently. But you should be OK. Add a comment if you need more assistance.

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  • Intermatic Master
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Wiring for GE, Lutron, Leviton, Intermatic, Swilight, Utilitec, Woods, UPM,Tork, Hagar, in-wall timershttp://waterheatertimer.org/Programmable.html#wireWiring for Intermatic ST01C, Ei600, Ei400, EJ351http://waterheatertimer.org/ST01C-program.html#wire Wiring for GE sunsmart:http://waterheatertimer.org/How-to-wire-GE-15312-timer.html

Posted on May 22, 2012

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1 Answer

GE digital timer 15313 has 3 wires, black, blue and green. Wall switch wires have bare, black, red and white from one line, and black and white from the other line. I've tried every combination


It sounds like you are replacing 3-way switch.
Low voltage light? Are these lights connected to 120Volt circuit?

I think you want the GE 15312 timer, instead of GE 15313.
http://waterheatertimer.org/How-to-wire-GE-15312-timer.html

GE 15313 is for single-pole incandescent light bulbs only.

This is live answer 11-2012
Add a comment for more interaction on answer.

Nov 22, 2012 | Hardware & Accessories

1 Answer

Im trying to install a Utilitech 0192773 self adjusting wall timer. It has four wires, black(hot), red(hot), white(neutral) and green(ground). I have a standard three light switch plate(outside light,entry...


Thank you for clear description of wiring, switches, and for including timer model number.

1) Open following link for ez programming and wiring for Utilitec.
http://waterheatertimer.org/Program-wire-Utilitec-0192773.html

2) Your single-pole switch has 2 wires.
0192773 replaces single-pole switch only.
Black wire that connects each of the switches is Hot wire: connect this wire to timer Black wire.
Other black wire that connects to switch goes to load: connect this wire to timer red wire.
Timer white wire connects to white wires that are covered with wire nut.
Timer green connects to bare ground wire.

3) How to connect stranded wire and solid wire
http://waterheatertimer.org/How-to-twist-electric-wire.html#stranded

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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.
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Sep 03, 2011 | Intermatic & Self-Adjusting Wall Switch...

1 Answer

Purchased utilitech 0192773 self adjusting wall timer. planning on installing in garage wall switch box for outside lamp posts, 3 total. the wiring in switch box consists of grounds tied together, 2 whites...


you got the wires you need. add switch's white to the white bundle in the back; green to grounds, red to the black going to the light; black to the other black. worked for me!

Jan 29, 2011 | Computers & Internet

1 Answer

I the manual wiring doesn't match what I have in the switch box. This switch is to operate 2 outside porch lights., previously wired to a single pole switch as follows.. one black wire to one screw and 2...


I test these timers.
GE 15071 timer has internal clock that runs on electricity. That's why timer has extra wire.
Intermatic, GE, Tork, Leviton, Sylvania, Woods, Utilitec etc in-wall timers each wire the same way.
The only tiny difference is GE doesn't have green ground wire.
http://waterheatertimer.org/Program-wire-Utilitec-0192773.html

Here's what to do:
1) Old switch has two screws (excluding green ground screw)
One screw on old switch has 2 black wires >> these are hot wires > timer black wire connects to these hot wires. This will power the timer.
2) The other switch wire connects to timer red wire. This will send timer signal to lights.

3) Timer white wire is for the timer clock.
Timer white wire connects to other white wires that are twisted together and covered with wire nut >>> these are neutral wires, and now timer clock will operate
4) For EZ connection to other white wires, strip back another inch on timer white wire so stranded wire can wrap like a candy cane around solid copper wires. Then twist wire nut on very tight.

5) When wiring is complete, push door on timer for manual override. Lights should turn ON-OFF. If lights do not turn on, reverse timer red and timer black wires. Make sure outdoor bulbs are working.

Add a comment any time

Dec 14, 2010 | Intermatic Inc. ST01C Digital In-Wall...

1 Answer

Am replacing an old wall timer with a GE Smart Digital Timer. The old timer had two black wires connected to two black wires from the wall. The new timer however has red, black, white and green wires. I...


I've tested these timers.
Here's what to do:
1) Connect green to bare copper
2) Switch has 2 wires. For now, connect these two wires to timer-black and timer-red. Choose either one.
3) In back of wall box are white neutral wires twisted together and covered with wire nut. Timer-white wire connects to these white neutral wires. This action gives power to time clock.
4) If wall box does not have white neutrals described above, then connect timer-white to bare ground wire. Bare ground connects to neutral busbar in breaker box.
5) Turn on power and click manual override button or switch. If lights turn on, timer is wired correctly. If lights do not turn on, then reverse timer-red and timer-black wires.

Nov 16, 2010 | GE 60minute Automatic ShutOff Timer Switch...

1 Answer

New switch GE model 15265 ... to light up 2 lightbulbs outside. Old switch all cables are black. Those who light up the tester are the hot=Red/black?? Those which do not light up are white?? Green I know...


Manual for GE 15265
http://waterheatertimer.org/pdf/GE-15265-manual.pdf
15A timer works fine on two bulbs, up to 1440 total watts.

If old switch has 2 screws plus green ground screw, then timer is right.
If old switch has 3 screws plus green ground screw, 15265 doesn't replace 3-way switch.

Timer-green wire connects to bare ground wire

Old switch has 2 screws with wires on each.
One wire is Hot-from breaker and this connects to timer-black wire.
One wire Goes-to-lights and this connects to timer-red wire.
If you get these two wires reversed, timer will not work, so reverse them.
It will not blow circuit if the timer-red and timer-black wires are reversed.

Timer-White wire is the confusing wire for everybody:
Timer-white wire runs clock motor located inside timer.
In back of electric box are neutral white wires that are twisted together and covered with wire nut.
Connect timer-white to these neutral wires.
If box does not have neutral white wires, connect timer-white to bare ground wire.

geno_3245_61.jpg

Nov 13, 2010 | Intermatic Inc. EJ500C Digital Wall Switch...

1 Answer

I have an outside light that I want this timer to control. The switch box has a black and a white going out to the light and a black and white with the electricity. The instructions show to hook the red...


You posted under ST01C timer which has 3 wires: black blue and red (no white wire)
Your description seems to say your timer has 3 wires: black white and red

These are two different timers
I'm going to give you two different instructions that are dead-accurate for both types of timers above:

1) Instructions for ST01C and EJ500 Intermatic timers with black blue and red
Lets do the black and white with electricity:
The black Hot wire connects to Timer-black-wire
The white Neutral wire connects to white wire going to Load (to lights)

Now the black and white to the Load (lights)
The black to Load (to light) connects to Timer-blue-wire
The white wires are connected together with wire nut

The red wire is capped off, and used only if you have 3-way switching.
Green connects to bare ground

2) Instructions for all in-wall timers with black, red and white wires (except Aube series timers)
Lets do the black and white from electricity
The black Hot wire connects to Timer-black-wire
The white Neutral connects to Timer-white-wire and to white wire going to Load

Now the black and white to the Load
The black wire to Load connects to Timer-red-wire
all three white wires are connected and covered with wire nut
Green connects to bare ground

DO NOT CONNECT RED TO WHITE with any model in-wall timer and then turn on power or it can blow out the timer >>> I just did that while experimenting with the Utilitec 0192773.
Red wire goes to Load on all timers, except with Intermatic ST01C and EJ500

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Oct 17, 2010 | Intermatic Inc. ST01C Digital In-Wall...

2 Answers

Utilitech Wall Timer #0192773 does not switch landscape lights on? Replaced Intermatic that had 3 wires. Black to Black, blue to black and red was capped. Utilitech came with 4 wires - black, white,...


Old timer: Intermatic EJ500 & ST01C timers have a battery. Battery operates the clock motor. Red wire is for 3-way circuit [a hallway with 2 switches is a 3-way circuit].

Utilitec timer, clock runs on 120Volt circuit instead of battery. So clock has to have power.

How to connect wires:
Black timer wire connects to hot wire from breaker box.
Red (or blue) timer wire goes to landscape lights.
White timer wire connects to white neutral wire [or if no neutral is available, connect to bare ground wire].
Green timer wire goes to bare ground wire.

How to find black hot wire and white neutral wire inside box
: Disconnect and separate wires so you can test. Use ordinary tester. Power is on. There is only 1 black hot wire inside each electrical box. Test each black wire to bare ground until tester light comes on > that identifies the black hot wire. Next, test black hot wire to white wires until tester light comes on > that is the neutral wire. Exception: This test does not necessarily work with 3-way switches since they reverse each time switch is thrown.

Sep 14, 2010 | Intermatic Inc. ST01C Digital In-Wall...

1 Answer

I am trying to install utilitech 7 day in-wall timer. Their are 3 switches in box controlling different fixtures. The old switch had black connected and a black looped to the next switch. How do I connect...


1) Wires in box:
Black looped to to next switch is Black hot wire
Other Black goes to fixture

2) Connect timer wires
Black timer wire goes to Black hot
Red (or Blue) timer wire goes to fixture
White wire connects to white neutral wires (usually connected together with wire nut and pushed to back of box)
Green goes to bare ground wire

Sep 04, 2010 | Intermatic Inc. ST01C Digital In-Wall...

1 Answer

Trying to replace Intermatic with Utilitech inwall timers. Have 2 black wires in wall box with other switches for other lights. Which of the Utilitech 4 wires- black, red, white & green get conected to...


The wires on your new switch are intended for black = power .. white = neutral . and red = lights .. with two black wires on the old switch I am assuming that there is a bundle of white wires in that wall box, the white timer needs to join that bundle ... then you need to determine which black wire is the power from the electrical panel ( voltage tester) and connect to the black timer wire .. the red timer wire connects to the other black wire in the wall..

Please Vote !!

Apr 08, 2010 | Intermatic Inc. EJ500C Digital Wall Switch...

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