Question about Intermatic Inc. EJ500C Digital Wall Switch Timer - Self-Adjusting Feature

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Need a wiring diagram for installing a EJ500C in place of a 3-way

Have 2 3-way switches need to replace one with a EJ500C timmer

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Locate the COMMON wire
connected to first old switch.
It might be attached to a different
colored screw, or find
markings on old switch.
Connect BLACK wire from
switch timer to COMMON
wire, using a twist connector.
Connect the other two wires from the old switch to either the
BLUE and RED wires from the switch timer.
Connect the ground wire from the box to the BARE COPPER
wire on the switch timer. If there is no ground wire, ground the
switch timer to the box. If the box is plastic, connect the bare
copper wire to ground as supplied or contact an electrician.
Locate the COMMON on the second old switch of the 3-way pair.
Connect jumper wire (supplied) from the COMMON terminal
to either of the other terminals on the remote 3-way switch.
Make sure all twist connectors are tight.
Tuck wires into wall boxes leaving room for the devices.
Mount the devices into the wall boxes, then install the wall plates.
Turn power back on at the service panel.
Make sure the switch timer displays “MAN” mode. Do the following
test with the remote switch in each of its 2 positions:
Press the NEXT ON/OFF button on the switch timer several
times. Each time that you push the
NEXT ON/OFF button, the
switch controlled light or device (the “load”) should turn on
or off. If so, proceed to Section 3.
If the timer display changes between ON and OFF but the
load does not operate, re-check your wiring and make sure
the load is functional.
If the timer display changes
between ON and OFF but the
load only operates when the
remote switch is in one of
its 2 positions, you need to
turn off the power at the service panel, change the jumper
wire to the other terminal. Then turn power back on at the
service panel and repeat. good luck

Posted on Jan 21, 2009

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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

Light turns off in the morning, but does not automatically turn on in the evening


Battery-operated Intermatic timers can develop problems.

1) Battery may need to be replaced.
http://waterheatertimer.org/ST01C-program.html#EJ500

2) Troubleshoot guide on manual says to 'reset and reprogram' timer if problems occur.
http://waterheatertimer.org/Intermatic-ej500c-manual.pdf

3) Timer comes with 1 year warranty and can just go bad.
http://www.intermatic.com/products/timers/consumer%20indoor%20timers/in-wall%20timers.aspx

Nov 21, 2010 | Intermatic Inc. EJ500C Digital Wall Switch...

1 Answer

Similar issue as above. I have a two-switch wall box. I want to replace one switch with a timer. The swtiches control separate lights and are part of a circuit with other lights, but they are not 3 way...


the black wires that are pigtailed are your hot and the red that is seperate is the switch leg. It will not be hot until you have it connected to a switch or the timer

Sep 29, 2010 | Intermatic Inc. EJ500C Digital Wall Switch...

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One of my five EJ500C timers controls 6 outdoor landscaping lights behind my house. I installed the energy saving (coil type) bulbs and, at roughly 15 minute intervals after the lights come on at dusk, the...


The EJ500C is designed only for standard incandescent lights, not chandelier bulbs, CFLs, etc. Replace it with the ST01C, and you'll be fine. Intermatic may even exchange it for you if you if you complain to them.

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GE Digital Time Switch (15132) for basic landscape lighting


Leave the breaker off, remove the wires from the timer and just connect them. then turn the power on. Unless you have a short somewhere, the lights should come on. What you have just done is made the breaker your switch. If the breaker kicks you know to keep looking for a short as it is not the timer. Regards, Joe

Jan 04, 2010 | Intermatic Inc. EJ500C Digital Wall Switch...

2 Answers

Same problem, when lights are on they flicker


could be a faulty batch. If all wiring correct then it must be the timer

Sep 20, 2009 | Intermatic Inc. EJ500C Digital Wall Switch...

1 Answer

Wiring problem


blue and black is for the hot and neutral. the red is for a 3-way switch

Jun 15, 2009 | Intermatic Inc. EJ500C Digital Wall Switch...

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