Question about Intermatic Timer T1905 24 Hour Dial 120V 20 Amps without Skipper

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Wiring program timer switch model t1905 intermatic

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http://www.intermatic.com/products/timers/mechanical%20time%20switches/24%20hour%20dial%20with%20skipper.aspx
T1905 has 4 screws: NO normally open > NC normally closed > COM > Clock
NO screw is on left
NC screw is 2nd from left
COM is 2nd from right
Clock is on right

A) How to wire t1905 for 125V
You will have four wires >> a Black and White from breaker box; and a Black and White to load

1) Black hot wire from breaker connects to COM
2) White neutral wire from breaker box connects to Clock
3) White neutral wire to load connects to Clock
4) Black wire to load connects to NO -or- NC screw [one of these screws will have no wire attached]
NO turns 'off' with times set on timer
NC screw turns 'on' with times set on timer
If you want your load to turn 'on' when timer clicks 'on' then connect Black wire to NC screw

B) How to wire t1905 for 240V
You will have four wires >> 2 hot wires from breaker box; and 2 hot wires to load. These wires might be Black and White or Black and Red



1) Black hot wire from breaker connects to COM
2) Red or White hot wire from breaker box connects to Clock
3) Red or White hot wire to load connects to Clock

4) Black hot wire to load connects to NO -or- NC screw [one of these screws will have no wire attached]

NO turns 'off' with times set on timer
NC screw turns 'on' with times set on timer
If you want your load to turn 'on' when timer clicks 'on' then connect black wire to NC screw

Posted on Sep 10, 2010

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Clock on T1905 timer switch has quit working. Fixable, or need a replacement?


120Volt T1905 Intermatic timer uses WG730 clock motor and 156T1950A tripper.
Timer will last many year by replacing parts, and keeping lubricated with touch of white grease, and not over-amping the 20 amp contacts
http://waterheatertimer.org/How-to-troubleshoot-Intermatic-timer.html
http://waterheatertimer.org/How-to-wire-T1906-Intermatic-timer.html
http://waterheatertimer.org/How-to-replace-Intermatic-clock-motor.html

This timer can be converted into 208-277Volt timer by installing WG733 clock motor instead of 120Volt WG730.

Nov 13, 2012 | Intermatic Timer T1905 24 Hour Dial 120V...

1 Answer

Do not know how to open door of the intermatic wall time switch Do not know howto set timer--I want timer to go on at 7 PM and turn off at 7 AM


Question posted under ET104 timer.
This timer arrives with default voltage set for 240Volts.
Move voltage selector to select 120Volts as per instruction manual:
http://waterheatertimer.org/pdf/Intermatic-et104c.pdf
You can add a comment any time for more specific help with this timer.

1) If this is a plastic enclosure, then push inward to unlatch enclosure door.
See illustration: http://waterheatertimer.org/images/IMG_9431-Open-enclosure-400.jpg

2) Model number of timer and wiring diagram and programming appear on inside of timer door.
Add a comment with timer number if different from below.

3) How to program ET104 timer:
http://waterheatertimer.org/pdf/How-to-program-Intermatic-ET104-timer.pdf
-Read instructions.
-Set current time.
-Set program 1 for 7pm
-Set program 2 for 7am
-Not necessary to use programs 3 4 5 6 7 8

4) More resources
http://waterheatertimer.org/Intermatic-timers-and-manuals.html#ET100

Sep 22, 2011 | Intermatic INC ET104CPD82 24 HOUR...

1 Answer

I have a 3 gang box: a is for hall light switch


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

Jun 19, 2011 | RTO Intermatic Digital 7 Day Wall Switch...

1 Answer

I have a Intermatic ST01C installed with a 3-way connection. The other day it started "clicking" on-off..on-off..on-off etc. and would not stop till I operated the non-timer switch leg in my...


Wiring could be suspect.
I have tested this timer.

ST01C works like this in 3-way circuit.
Timer program turns lights on-off.
When blue wire and red wire are connected together, then timer reverses on-off program.

So the only function of second 3-way switch is to connect and disconnect blue and red wires on the timer.
The second 3-way switch is wired differently than ordinary 3-way.
See illustration below.
http://waterheatertimer.org/ST01C-program.html#3way

Either the switch or timer have malfunctioned.
My bet is the timer.

1) Replace 3-way switch and see if problem clears up

2) Manual says: reset timer when encountering problems.
Hold down on-off button and push-and-release reset button.
Keep holding on-off until INIT displays.

3) You have to completely reprogram timer after reset.
Link above has ez steps.

ST01C manual:
http://waterheatertimer.org/Intermatic-st01c.pdf

Feb 22, 2011 | Intermatic Inc. ST01C Digital In-Wall...

1 Answer

Model ST01 to be used on a 3 way switch arrangement. Unit works in one switch position but fails to allow light to turn on in other switch position. Several other switches are adjacent in same box and...


You have ST01C timer.
If I understand correctly, timer is wired for 3-way and was working fine before.
Now, the timer is no longer letting the 2nd 3-way switch operate.

I tested this timer.
When the red and blue wires on timer are connected, the timer reverses.
When the red and blue wires are disconnected, the timer reverses back.
So the 2nd 3-way switch merely connects and disconnects the red and blue wire on timer.
This is why wiring is different on 2nd 3-way switch, and not like ordinary 3-way wiring.
http://waterheatertimer.org/images/ST01C-EJ500-w-3-way-450.jpg

This means that a) Timer has gone bad or b) 2nd 3-way switch has gone bad.

1) Replace 2nd 3-way switch

2) ST01C instructions say as last resort, reset timer.
However all timer programs will be lost.
Open following link to read steps for resetting and reprogramming timer, plus wiring diagrams.
http://waterheatertimer.org/ST01C-program.html

3) Replace timer
Amazon:
http://www.amazon.com/Intermatic-ST01C-Digital-wall-Timer/dp/B0045D3D16
Aplussupply
http://www.aplussupply.com/intermatic/timer.htm

Add a comment for more free help.
Also take advantage of fixya phone service.
For a price, expert speaks with you over phone while you work on timer or any do-it-yourself project.
Fixya is always less expensive than a service call.

Jan 30, 2011 | Intermatic Inc. ST01C Digital In-Wall...

1 Answer

Is it possible to connect a digital timer(4 wires) to lite fixture with two switches? The switch I am trying to connect to is three pole and a ground


If I understand correctly, your switch has 3 poles, which makes it a 3-way switch.
You confirm this by saying light fixture has two switches.

There are two brands of in-wall timers that will work in 3-way situation. Intermatic and Aube. But only specific models of these timers work for 3-way.

The Intermatic EJ500 and ST01C battery-operated timers can work with 3-way switch. But wiring is tricky to impossible in some cases without extra wiring.
http://waterheatertimer.org/ST01C-program.html#ST01C


The easiest timer to wire for 3-way switch is Aube model T1032 which is a 500 watt timer.
http://waterheatertimer.org/Aube-timers.html
T1032 manual:
http://waterheatertimer.org/Aube-T1032-timer.pdf
geno_3245_147.jpg
Look at the wiring diagrams carefully.
Note that you are replacing one switch with the timer.
The second switch needs additional jumper wire added to circuit between dark-colored screw and the brass-colored screw that connects back to #1 wire from the timer.

Add a comment if you have this timer, or buy this timer, and need help with wiring.

Dec 06, 2010 | RTO Intermatic Digital 7 Day Wall Switch...

1 Answer

Flickering bulbs


You posted under EJ500 Intermatic battery-operated timer.
If you have different timer, add a comment.
I have tested EJ500 timer.

A) If this is new single-pole installation and lights click on-off when timer turned on, then you connected red wire where blue wire should be connected.

Manual says for single pole switch:
Timer-black-wire to Hot; Timer-blue-wire to Load (lights)
Here's how to wire timer correctly:
1) Timer-green-wire connects to bare ground wire.
2) Switch has 2 wires. Take switch wires and connect them to timer-black-wire and timer-blue-wire. Choose either one for now.
3) Put wire nut on red wire.
4) Turn on electricity, and push ON-OFF button. If lights come on, timer is wired correctly. If lights do not come on, then reverse timer-blue and timer-black wires.

B) If you are replacing 3-way switch, view wiring diagrams shown on link below, and then add a comment saying exact color of wires. To wire this timer for 3-way can require additional wire between switches. This is because EJ500 blue wire must always go to Load (light, fan, motor)
http://waterheatertimer.org/ST01C-program.html#EJ500-wire

C) If this is older timer that stopped working, check your bulbs. Then check timer battery. Manual says if timer stops working and bulbs are good, and battery good, then reset timer and reprogram. How to reset timer. Press reset button while holding down Next/ON-OFF button.
EJ500 manual has long list of programming instructions: Add a comment if you forgot parts of programming.
EJ500 manual
http://www.intermatic.com/~/media/files/intermatic/products/instructions/timers/ej500c%20-%20english.ashx

Nov 28, 2010 | Intermatic Inc. EJ500C Digital Wall Switch...

1 Answer

I have digital programmable timers (Model DT121 and Model DT11) that will accept programs, but won't turn the attached lamps on and off at the programed times. The batterys are new and I've had them...


DT121 Manual
http://www.intermatic.com/~/media/files/intermatic/products/instructions/timers/dt121c%20-%20english.ashx

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

Intermatic does not show DT11
Intermatic shows the DT121 is no longer available

If the display shows and you can set programs, then the battery is good.
Does the manual override work? This indicates whether the timer on-off switch operates.
If manual override does not work, then I discovered that timers are no longer any good

Programming:
Set present time
Then set ON time for program 1
Set OFF time for program 1
Then set ON time for program 2
Set OFF time for program 2
Most timers will not function if there is a conflict in programming > for example Program 1 says ON at 6 and OFF at 7 and Program 2 says opposite or has overlapping times
When events are set, press SET once > this will put timer in RUN mode

If manual override works, and you set programming correctly, but timer does not carry out instructions, I guess the timer is no good.

Intermatic has 24 hour timers with 2 on-off per day
http://www.intermatic.com/products/timers/consumer%20indoor%20timers/lamp%20%20appliance%20timers.aspx
Intermatic has 7-day digital timers (all digital timers today are 7 day where you select the day that each program works)
http://www.intermatic.com/products/timers/consumer%20indoor%20timers/digital%20timers.aspx

Oct 12, 2010 | Intermatic Hardware & Accessories

1 Answer

Model T104P wiring instructions for 110volt motor


T104 timer is for 240 Volt circuits. It has internal 240V clock motor. Clock terminals and timer terminals are connected, so there is no way this timer can control 110V circuit.
http://waterheatertimer.org/How-to-wire-T104-Intermatic-timer.html

T101 timer is for 110V circuit.
T101 has 110V clock motor
Both white neutral wires = terminal A.
Black hot wire from breaker box = terminal 1
Black wire to load = terminal 2.
Grounds = green screw
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T103 timer is for 110V circuit
T103 has 110V clock motor
Both white neutral wires = terminal A.
Black hot wire from breaker box = terminal 3
Black hot wire to load = terminal 4
Grounds = green screw

T1905 timer is for 110V circuit.
T1905 has 110V clock motor
Both white neutrals = Clock terminal
Black hot from breaker = COM
Black to load = NO [load comes on when timer turns on]

Sep 21, 2010 | Intermatic & Indoor/Outdoor Rain Tight...

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