How to replace the timer switch - GE Spacemaker Washer and Dryer Electric Laundry Center

Copy following link to identify timer and download manual:
http://waterheatertimer.org/UPM-timers-and-manuals.html#ETW
ETW can be used to replace 3-way switch.
3-way switching has 2 switches. Timer can replace one switch or the other switch, but not both.
The remaining 3-way switch must be rewired as shown in manual. What the remaining 3-way switch does is reverse timer programming, so programmed ON times become OFF times, and OFF times become ON times.
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Utilitec timer will not work for 3-way switching.
When 2 switches control same lights, then that is called 3-way.

Utilitec is for single pole only. The Utilitec timer is very solid timer otherwise.
http://waterheatertimer.org/Program-wire-Utilitec-LW60419.html

I recommend Aube timer as easiest for 3-way switching.
It replaces either 3-way switch, works for CFL or incandescent, and is a solid Honeywell product like their line of thermostats. Aube timers have internal battery and cannot be exposed to freezing temperatures or extremes of heat.
http://waterheatertimer.org/Aube-timers-and-manuals.html

Note: With 3-way timer, the timer replaces one 3-way switch, and the other 3-way switch remains.
In all cases with 3-way timers, the remaining 3-way switch is rewired slightly to accommodate how the timer works.
Read the manual carefully and look at images. Add a comment for more help with 3-way timers.

No.
If you have Woods in-wall timer, it is for single-pole application only.

Open following link to see timers rated for 3-way application, and links to each 3-way timer and manual for that timer.
http://waterheatertimer.org/Woods-timers-and-manuals.html#59028

Remember when installing a 3-way timer, the timer replaces only one of the switches.
In all applications, the remaining 3-way switch is rewired slightly to accommodate the timer operation.
Some 3-way timers can only replace the 3-way switch that has the hot wire from breaker.
Some 3-way timers require additional wire run between the timers.
The most versatile 3-way timer is Honeywell Aube: it can replace either 3-way switch.
Be careful and read manual wiring diagrams to see how to rewire remaining 3-way switch.
http://waterheatertimer.org/Aube-timers.html

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Utilitec can only replace single-pole switch.
Open following link for typical Utilitec single-pole wiring:
http://waterheatertimer.org/Program-wire-Utilitec-LW60419.html

Aube timer has internal battery that runs clock mechanism and does not require neutral wire.
The Aube battery lets timer replace single-pole or 3-way switch.
Utilitec timer does not have battery, so clock mechanism requires neutral wire, just like plugging in electric clock.
Without battery, timers like Utilitec can only replace single-pole switch.

Open following link to see list of timers that can be used for 3-way:
http://waterheatertimer.org/Aube-timers.html#3-way

When installing 3-way timer, the timer replaces one 3-way switch but other 3-way switch remains.
The remaining 3-way is rewired to accommodate the specific timer being used.
SOME brands of timer cannot replace either 3-way switch, but instead can only replace the 3-way that receives hot wire from breaker: Read manual before selecting timer.

Note: Battery-operated timers can be used for 3-way application, but cannot operate in cold environment.

Woods 59208 is single-pole timer.

Open following link to see list of timers used for 3-way application:
http://waterheatertimer.org/Woods-timers-and-manuals.html#59028

When replacing 3-way switch, some timers can replace either switch. For example Aube and GE.
Other timers can only replace switch that receives power from breaker. For example Intermatic.

The timer replaces only 1 of the 3-way switches.
The other 3-way switch remains.
But in all cases, the remaining 3-way switch has to be rewired to accommodate the timer.
3-way timers cannot replace 3-way switch wire-for-wire.
3-way timers mimic 3-way operation. When 2 of the timer wires are connected, the timer reverses programming. When those two wires are disconnected, the timer programming resumes. So off becomes on, and on becomes off.
The remaining 3-way switch has to be rewired so that switch connects and disconnects the two timer wires that mimic 3-way operation.

Woods 59208 is single-pole timer.

Open following link to see list of timers used for 3-way application:
http://waterheatertimer.org/Woods-timers-and-manuals.html#59028

When replacing 3-way switch, some timers can replace either switch. For example Aube and GE.
Other timers can only replace switch that receives power from breaker. For example Intermatic.

The timer replaces only 1 of the 3-way switches.
The other 3-way switch remains.
But in all cases, the remaining 3-way switch has to be rewired to accommodate the timer.
3-way timers cannot replace 3-way switch wire-for-wire.
3-way timers mimic 3-way operation. When 2 of the timer wires are connected, the timer reverses programming. When those two wires are disconnected, the timer programming resumes. So off becomes on, and on becomes off.
The remaining 3-way switch has to be rewired so that switch connects and disconnects the two timer wires that mimic 3-way operation.

Woods 58018 is White-colored 120Volt 7-day programmable timer that replaces single-pole switch only.
I am not certain what is meant by 3-pole circuit.
If you mean 3-way circuit where more than one switch control same light, as you find with hallway light, then 59018 is not correct timer.

Open following links to see list of timers suited for 3-way switch replacement.
http://waterheatertimer.org/Woods-timers-and-manuals.html#59028
http://waterheatertimer.org/GE-timers-and-manuals.html#15312
http://waterheatertimer.org/ST01C-program.html#ST01C

Timers that work for 3-way do not replace 3-way switch wire-for-wire.
Read manual carefully.
When you replace 3-way switch with a timer, one 3-way switch is replaced, and other 3-way switch remains.
The remaining 3-way switch is always rewired so the 3-way timer works. AND each brand of timer requires slightly different wiring parameter.
Some 3-way timers can only replace the 3-way switch located closest to circuit breaker box, commonly called the LINE side. Others can replace either LINE side or LOAD side 3-way., and wiring is different for each. Some timers require neutral wire and some are battery-powered.

Add a comment with exact information about switch and wiring you are working on for suggestion of best timer for that purpose.

You posted under ST01C and are wiring timer to replace 3-way switch.
Open following link for specific illustrations:
http://waterheatertimer.org/ST01C-program.html#ST01C
http://waterheatertimer.org/pdf/ST01C-explanation.rtf

1) The timer replaces one of the 3-way switches. The other 3-way switch remains, but must be rewired.
2) The timer must replace the 3-way switch that receives power from breaker box. It cannot replace the other 3-way switch. This is because the timer Black wire must always receive power.
3) The timer blue wire must connect to Load (light)
4) The ST01C red wire is only used when wiring for 3-way.
5) When the red wire and blue wire are connected together, they reverse the timer program. When timer red and blue are disconnected, the timer resumes programming. Connecting and disconnecting the red and blue wires is how the timer mimics 3-way operation.
6) The remaining 3-way switch must be wired so it will connect and disconnect the red and blue timer wires. So the remaining 3-way switch has to be rewired to meet specific timer wiring.

Swylite LST100 timer has 4 wires. Red, Blue, Black, White
Timer has more wires than wall switch because timer has electric clock inside. And with + series Swylite timer, it also has led bulb that needs power.

Timer can replace ordinary on-off switch
-On-off switch has 2 screws, so 2 wires (plus ground wire) connect to on-off switch
-Three of the four timer wires are used when replacing on-off switch
-Red wire is not used, it is capped off

Timer can replace 3-way switch
-Three way switch has 3 screws, so 3 wires (plus ground wire) connect to 3-way switch
-One of the screws on 3-way switch is colored dark (it is crucial to identify the wire that comes off dark screw so timer can be wired correctly)

Lets replace on-off switch see diagram
Timer black goes to Hot wire
Timer blue goes to Load (light, fan, motor)
Timer white goes to Neutral
Timer red is capped off.

How to check which wire is Hot, Neutral and Load
Switch you are replacing has 2 wires > one is Hot, the other goes to Load
Remove these two wires. Separate wires so you can test. Turn on power. Tape tester leads to wood sticks so hands are away from power. Test each wire to bare copper wire.
When tester lights up >> that is Hot wire >> please connect this wire to Timer black wire
The other wire goes to Load >> please connect this wire to Timer blue wire.
Now test for Neutral. Test Hot wire to other wires inside box. Neutral should be white. When tester lights up, that is Neutral. Please connect Timer white wire to neutral. IF YOU DO NOT have a neutral, you can connect Timer white to bare ground wire until you have time to drop a Neutral into the box.

Replace a 3-way switch see diagram
Three-way switch has 3 wires.
Identify which wire connects to Dark screw on switch >> and then please connect this wire to Timer Black wire.
Timer white wire connects to Neutral
Timer blue and red wires connect to other two wires that came off switch ... they connect to either one.

First, the timer has to rated for 3-way application.
Not every timer works for 3-way.
Open following link for some timers that work for 3-way application.
http://waterheatertimer.org/GE-timers-and-manuals.html#15071

Next thing is to read instruction manual carefully.
Since 3-way switches come in pairs, the timer replaces one of the switches, and then the other switch remains.
Some timers can replace either switch, and some timers can only replace the switch that receives hot from breaker.
In all cases, the remaining 3-way switch must be rewired to accommodate how the timer works.