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

2 Answers

Intermatic EJ500 gets VERY HOT on metal portion around timer

I have two EJ500C wall timers mounted side by side. They control sockets outdoors that are running Christmas lights. After installing the wall timers, but before installing the plastic face plate, I noticed the metal mounting brackets on the timers getting very hot when the lights are on. So hot that it is not possible to touch metal for more than 1 second. This seems odd. Is this normal? What causes it? Is it too much load for the timers? A guy in the electical department of Home Depot mentioned that it could be a grounding issue.

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  • Anonymous Dec 16, 2008

    I have the same issue, any ideas

  • retlaw54 Dec 22, 2008

    I also have the same problem, but the problem did not occur until I used the timer to control Christmas lights. I removed several sets of lights from the circuit and the temperature decreased but did not go away. Normally, the timer controls low voltage outdoor lighting and a fountain pump. I never noticed the temperature problem before.

    The temperature got hot enough that the danger of fire was very real.
    There is nothing that I could find on Intermatic web site or in their troubleshooting materials that came with the timer.

    Query: Would it make a difference if the house wires to the timer were reversed. The instructions with the timer do not specify which wire should go where.


  • DDD8 Dec 28, 2008

    Replaced old intermatic timer with the ej500. Simptoms are the same - after a couple of minutes of running christmas lights (outdoor), the unit becomes very hot to the touch.

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Sounds like you have too much load. The device is using its heatsinks like they were designed for. To dissipate heat.

Posted on Jan 12, 2009

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One timer supports 500 Watts maximum.

Each 25 light strand of c7 lights consumes 75 Watts; therefore the maximum number of c7 lights is roughly six 25 light strands per timer.

Each 50 light strand of minilights consumes about 25 Watts; therefore the maximum number of minilights per timer is about 1000 lights or twenty strands of 50 lights per timer.

Posted on Apr 13, 2009

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1 Answer

I can't download the instruction manual from Intermatic's website. I have a EJ500C timer and want to know why they caution against using it with CFL's and how to program it to shut off...


EJ500 7-day or astronomic timer is incandescent light bulb timer.
Different timers have different Load ratings.
Intermatic ST01C timer can control CFLs.
Aube timers have same wiring capability as Intermatic, and offer CLF control, but you have to choose either astronomic timer, or 7-day timer.
Open following links for manual and timer information.
http://waterheatertimer.org/Intermatic-ej500c-manual.pdf
http://waterheatertimer.org/Intermatic-timers-and-manuals.html
http://waterheatertimer.org/Aube-timers.html

Jul 16, 2011 | Intermatic Inc. EJ500C Digital Wall Switch...

1 Answer

Just moved into a home with the Intermatic EJ500C Indoor Digital Wall Timer. Can you help us program this or disconnect this. We would like to turn on our outside lights.


If the timer is setup, you can press the MODE button until it shown MAN.
Press on the door of the switch timer for on & off.
You can printed a pdf manual at this site.
Click on English under Instruction Manuals
Also there is an Easy Set Instructions under Supporting Documentation.

http://www.intermatic.com/products/timers/consumer%20indoor%20timers/in-wall%20timers/ej500c.aspx

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

2 Answers

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.

Feb 27, 2010 | Intermatic Inc. EJ500C Digital Wall Switch...

1 Answer

Does ej500c have a dimmer feature?


this has an incandescent lighting control , dont know if this is what you need to help ?

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

2 Answers

While the lights are on, they flicker every 10 minutes or so


This is a common problem with that model. 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.

Jul 22, 2009 | Intermatic Inc. EJ500C Digital Wall Switch...

1 Answer

Can I use the Intermatic EJ500CH timer in an outdoor box?


No as long as the box is well insulated.
The operating temperture must not fall below - 5

May 24, 2009 | Intermatic Inc. EJ500C Digital Wall Switch...

1 Answer

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


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

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

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