Intermatic St01c
User Manual: Intermatic-st01c
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ST01/ST01K/EI600
In-Wall Timer with Astro Feature
Installation and User Guide
RATINGS
ST01/ST01K EI600
Operating 
Voltage 120-277 VAC, 50/60 Hz
Resistive 
(heater) 15 A, 120-277 VAC 20 A, 120-277 VAC
Tungsten 
(incandescent) 15 A, 120 VAC; 6 A, 208-277 VAC
Ballast 
(uorescent)
8 A, 120 VAC; 
4 A, 208-277 VAC 16 A, 120-277 VAC
Motors 1 HP, 120 VAC; 2 HP, 240 VAC
DC Loads 4 A, 12 VDC; 2 A, 28 VDC
Operating 
Temperature 32° F to 104° F (0° C to 40° C)
Dimensions 4 1⁄8” H x 1 3⁄4” W x 1 13⁄16” D
SAFETY SECTION
WARNING
Risk of Fire or Electric Shock
•  Disconnect power at the circuit breaker(s) or disconnect 
switch(es) before installing or servicing (including replacing 
the battery).
•  Installation and/or wiring must be in accordance with 
national and local electrical code requirements.
•  Use COPPER conductors ONLY.
•  Do Not recharge, disassemble, heat above 212° F (100° C), 
crush, or incinerate the Lithium battery. Keep out of reach 
of children. 
•  Replace battery with Type CR2 only that is certified by 
Underwriters Laboratories (UL).
•  Do NOT use timer to control devices that could have 
dangerous consequences due to inaccurate timing, such 
as: sun lamps, saunas, heaters, slow cookers, etc.
NOTICE
•  Risk of timer damage due to leakage if weak battery is not 
replaced promptly. 
•  Dispose of product per local regulations for disposal of 
Lithium batteries.
Spring Grove, Illinois 60081
www.intermatic.com
PRODUCT DESCRIPTION
The ST01 Series and EI600 Series In-Wall Timers 
give you versatility in a simple to install, 24/7 
programmable package. These timers allow you to 
customize your timer schedule with automatic dusk/
dawn, random, and Daylight Saving Time (DST) 
programming options for up to 40 ON/OFF events. 
The ST01 Series and EI600 Series are incandescent/
fluorescent/CFL/LED compatible. In addition, these 
timers can handle any load type and require no 
neutral wire connection, making them ideal for any 
application, regardless of complexity.
TIMER INTERFACE
Display
Mode button
On/Off button
– button (Decrease)
+ button (Increase)
Reset button
Access door to 
battery tray
PRE-INSTALLATION
Before mounting the timer in the wall, install the 
supplied battery. 
1.  Gently pry open the access door, located below 
ON/OFF, and remove the battery tray from the 
timer. 
2.  Place the supplied CR2 battery into the battery 
tray, matching the battery + and – markings to 
the + and – markings on the tray, then place the 
battery tray back in the timer.
3.  The display initializes, then flashes 12:00 am in 
manual mode.
4.  Press ON/OFF. The timer “clicks” to confirm it is 
ready for programming.
Note:  If the display doesn’t flash 12:00 am, check/replace 
the battery before proceeding.
NOTES
Read these notes before continuing with the timer 
installation and programming process.
•  The timer is battery-powered and does not need 
AC power for initial setup and programming. For 
new installations, it is recommended that you set-
up and program your timer before installing it.
•  The battery controls the ON/OFF function (“click-
ing” sound) and maintains the time and date. The 
screen flashes BATT when the battery strength is 
low. When replacing the battery, disconnect AC 
power. You will have a few minutes to insert new 
batteries before the date and time settings are lost. 
All other settings will remain in memory, without 
battery or AC power.
•  Each ON or OFF setting is an event. Each event 
must be programmed separately. 
•  The MODE menu includes SETUP, PGM (program), 
AUTO (automatic), RAND (random), and MAN 
(manual). AUTO and RAND modes do not appear 
on the menu options until the time of day is set 
and at least one ON or OFF event is programmed. 
•  All menus loop (repeat options when you get to the 
end of the menu). When in a specific Mode, press 
ON/OFF to loop within that Mode.
•  When using the + or – buttons to change a flash-
ing setting, hold the button to make the numbers 
scroll faster. 
•  When advancing to the next setting, the timer 
automatically saves the data from the previous 
screen whether you changed a setting or not. All 
settings save automatically after five minutes.
PROGRAMMING
Follow these steps for initial setup and programming 
of the ST01 Series and EI600 Series timers. (On the 
following images, a white background with dashed 
lines indicate what should be flashing on the unit).
Reset
1.  Press and hold ON/OFF and RESET for five 
seconds. A paper clip or pen may be necessary 
to depress RESET.
2.  Release RESET, then release ON/OFF. The 
display flashes 12:00 am.
Initial Setup
1.  Press MODE until SETUP  
appears on the display.
2.  Press ON/OFF to confirm.
3.  Press + or - to adjust the 
menuitem (HOUR).
4.  Press ON/OFF to advance to 
the next menu item (MINUTES).
5.  Repeat steps 3 & 4 to set the 
MINUTES, YEAR, MONTH, 
andDATE. 
Note:  After setting the DATE, thecurrent day of the 
week flashes. Verify the DAY. If wrong, press + 
or - to review and adjust the YEAR, MONTH, and 
DAY. Press ON/OFF to confirm.
6. 
NRT H
Z ONE
AUT O
DST
DST (DaylightSavingTime)  
flashes.
•  If you live in a state that 
DOES NOT observe DST, 
press + to change DST 
to MAN, then press  
ON/OFF.
•  If you observe DST,  
press ON/OFF.
7.  Press + to select a ZONE. 
Note: 
NORTH
CENTRAL
SOUTH
Your ZONE is astronomically based on how far 
North, Center or 
South you are in 
North America. 
Canada, select 
North. Mexico, select 
South.
8.  Press ON/OFF to confirm.  
You will see the sunrise  
hour flashing and DAWN.
(ONLY IF necessary, do the next 
two steps, otherwise go to 9).
•  To adjust the hour, press 
+ or -, then press  
ON/OFF.
•  To adjust the minutes, press + or -, then 
press ON/OFF.
9.  Press ON/OFF to confirm. Use the same 
process when adjusting the time for DUSK.
Programming Events
Note:  Program ON and OFF events as separate events.
1.  Press MODE until PGM  
appears on the display.
2.  Press ON/OFF to confirm. 
An event number flashes. 
Note:  If this is the first event,  
you will see 01.
3.  Press ON/OFF to confirm 
the event number. 
4.  Use + to select the event type.
•  ON - sets an ON event 
•  SKIP - stops the event
•  OFF - sets an OFF event
5.  Press ON/OFF to confirm. 
6.  Use + to select a time type. 
•  DAWN
•  DUSK
•  Fixed Time
7.  Press ON/OFF to confirm.
http://waterheatertimer.org/Programmable.html#st01

158--01898
INSTALLATION
1.  Disconnect the power at the service panel.
2.  Remove wall switches, if applicable.
3.  7/16"
Strip the existing wire ends  
to7/16".
4.  Wire the timer into the wall box. 
An example of single-pole and three-way wiring 
follow. For other three-way wiring scenarios, go 
towww.intermatic.com.
Single-Pole Wiring
A
B
D
C
ABlack —  Connects to the hot (black) wire from the Power 
Source
BBlue —  Connects to the other wire (black) from the load
CRed —  This wire is not used in single-switch installations. 
Capwith a twist connector
DGreen —  Connects to the supplied ground
Three-Way Wiring
Note:  The distance between the timer and the remote 
switch must not exceed 100 feet.
A
B
D
C
ABlack —  Connect to the wire removed from the “COMMON” 
terminal of the switch being replaced 
BBlue —  Connect to one of the other wires removed from the 
switch being replaced. Record the wire color connected 
to the blue wire for use during load-side installation
CRed —  Connect to the remaining wire removed from the switch 
being replaced. Record the wire color connected to the 
red wire for use during load-side installation
DGreen —  Connect to the supplied ground
Note:  Connect the timer on the line-side.
Note:  Consult a qualified electrician:
•  If you have trouble differentiating the wiring 
colors for the building. 
•  When using a single-pole switch at the 
remote location for new construction or to 
replace a dimmer switch, a lighted switch, 
or a three-way switch without screw 
terminals. 
Finalizing Installation
1.  Make sure the twist-on wire connectors 
(provided) are secure, then tuck the wires into the 
timer wall box, leaving room for the timer.
2.  Using the provided screws, secure the timer to 
the wall box.
3.  Cover the timer with the wall plate and secure 
using the provided screws.
4.  For three-way wiring, install the remote switch in 
a wall box. Cover the switch with the wall plate 
and secure. 
5.  Reconnect the power at the service panel.
TESTING THE TIMER
1.  To test the battery, press ON/OFF. The timer 
should “click.”
2.  Make sure the timer displays MAN mode during 
testing.
3.  For three-way wiring, test the remote switch in 
each of its two positions by pressing ON/OFF 
several times. The timer should “click” and the 
controlled light or device (load) should turn ON 
or OFF. 
4.  For three-way wiring, if the timer clicks, but the 
load does not operate: 
a.  Disconnect the power at the service panel.
b.  Re-check your wiring and make sure the 
load is functional.
c.  Reconnect the power at the service panel.
d.  Retest.
5.  For three-way wiring, if the timer clicks, but the 
load only operates when the remote switch is 
in one of its two positions, repeat Step 4, a-d, 
paying close attention to the wiring that connects 
with the red and blue wires of the timer. 
Note:  Consult a qualified electrician if the switch and timer 
fail to operate as intended.
When the timer “clicks” and the controlled device 
turns ON and OFF as appropriate, congratulations, 
the timer is successfully installed! Enjoy your new 
timer!
TROUBLESHOOTING
Observed Problem Possible Cause What To Do
Timer does not 
switch ON/OFF 
but display looks 
normal.
Timer is not set in AUTO, RAND, 
or MAN mode.
Press MODE 
to select the 
operational mode 
you want to use.
Timer resets to 
12:00.
Timer is installed in conjunction 
with a contactor or motor load.
Install a line filter.
Timer won’t enter 
Auto or Random 
mode when you 
press Mode.
No schedule is selected. Define a schedule 
of events.
Timer switches at 
incorrect times or 
skips some of the 
programmed times.
The active schedule has a 
conflicting setting.
Review the settings 
and revise them as 
necessary. 
Timer is in Random mode, which 
varies switching times up to 
+/-15 minutes.
Select the Auto 
Mode. 
The Astronomic and Defined 
switching times are in conflict, 
your DST may or may not 
be turned on, and/or your 
Astronomic Zone is not set to 
Center, North, or South.
Note: Your timer automatically 
skips any conflicting ON event as 
summer approaches to prevent 
unwanted operation of lights or 
other controlled devices.
 Review  your 
program settings 
and revise them as 
necessary. 
Switching inductive loads, 
such as electrical contactor or 
motor load.
Add a noise filter 
e.g., ET-NF. Connect 
filter across load’s 
coil.
Load only operates 
when the remote 
(three-way) switch 
is in one position or 
the timer ignores the 
remote switch.
The remote switch is wired 
incorrectly.
Recheck the wiring, 
especially for the 
jumper. 
The timer ignores a 
three-way remote 
switch even though 
it is wired correctly 
or the load turns off 
immediately after 
being turned ON.
•  The remote switch or timer is 
wired wrong.
•  There is an excessive length of 
wire (greater than 100 feet).
•  There is buried wire to the 
remote switch.
•  The remote switch is not 
functioning properly or 
worn out.
Contact a qualified 
electrician.
The battery tray is 
difficult to replace.
Battery is not seated in the tray.
• The tray is misaligned.
•  The contact tabs of the tray 
are bent
Seat the battery 
in the tray, then 
reinstall.
The timer operation 
is sluggish or not 
switching 
ON/OFF at all.
Though the “BATT” message is 
not being displayed, the battery 
is getting weak.
Replace the battery. 
To test the battery, 
press the ON/OFF 
button. The timer 
should “click.”
Timer shows ON but 
the light or other 
controlled device 
is OFF.
The light or controlled device 
itself may be switched OFF.
Make sure the light 
or controlled device 
is switched ON and 
plugged in.
Note:  When installing either timer with a contactor or 
motor load, a line filter is recommended.
LIMITED WARRANTY
For detailed warranty information, refer to the 
Intermatic website at www.intermatic.com, 
contact Intermatic by mail at Intermatic 
Incorporated Customer Service / 7777 Winn Rd., 
Spring Grove, Illinois 60081¬9698, or by phone 
at: 815-675-7000.
Note:  To set a Fixed Time, press ON/OFF, then + or - to 
adjust the hour. Press ON/OFF. Use the same 
process to set minutes. Press ON/OFF to confirm.
8.  Use + to select the days  
the event runs.
•  ALL - all seven days of 
the week
•  M-F - Monday through Friday
•  WKD - Saturday and Sunday
•  Individual day - select: SUN, MON, TUE, 
WED, THU, FRI, or SAT
9.  Press ON/OFF to confirm. The display reads 
SAVE, then flashes the event number to 
indicate the event is saved.
Note:  To continue programming events, such as the 
OFF event, use + to advance to the next event 
number, then repeat steps 3 through 9.
Setting a Mode
AUTO Timer operates per your programmed schedule of 
ON/OFF events.
RAND Timer operates your schedule at +/- 15 minutes 
from the programmed time.
MAN Operates like a manual ON/OFF switch, disregards 
any programmed events.
Note:  To set the timer to recognize your programmed 
events, press MODE to scroll to AUTO or RAND 
only.
Changing Events
1.  Press MODE until PGM  
appears on the display.
2.  Press ON/OFF to confirm. 
An event number flashes. 
Use + to find the correct  
event number.
3.  Press ON/OFF to confirm. 
•  To change the ON/OFF 
status of an event, use  
+ to select the event 
type.
 –ON - sets a previously OFF event to ON
 –SKIP - suppresses the selected event 
so it is not initiated by the timer. This is 
helpful for unusual programming needs, 
like vacation settings.
 –OFF - sets a previously ON event to OFF
•  To update an existing setting, press 
ON/OFF until the setting to be updated 
displays. 
 –Press + to adjust the setting.
4.  Press ON/OFF to cycle through the program 
until the display reads SAVE.
5.  Press MODE to exit the programming menu.