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

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Timer comes on at different hours of the day and night

I have an ej500 timer from Intermatic inc. I have the times set to come on every evening and sometimes it does and other times it comes on during the tday

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  • Craig Butler
    Craig Butler May 11, 2010

    You need to reprogram it, you have a day time programmed in to it, that's why it comes on during the day.

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Make sure its set to auto not random. also, make sure you dont have additional times in your setting.

Posted on Jul 14, 2009

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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

I am an electrician and my client wants me to reprogram the digital timer (Intermatic) I don't know the model # but it looks like the one on the previous page. Probably the most popular digital wall timer...


Below are links to digital timers to help identify your timer.
Manuals for each timer appear on page.
Programming takes patience, which might be why your customer wants you to do it.
And these 1-year warranty timers go bad, and then timer will not reprogram, which may be another reason why customer wants you to do it.
Intermatic EJ500 and ST01C are battery operated, and will not program if battery is low.
Aube has rechargeable battery that is not replaceable, and this timer will not program if battery is bad.
Other timers shown below have clocks that operate on 120V circuit and require white neutral before display lights up.

Generally each programming is same: You set current time. Some timers you set daylight savings time. Some timers are 7-day, and some offer dusk-to-dawn. For 7-day, you set event1 ON and then event1 OFF for up to 7 programs. You choose the days for each event to operate. Before programming, make a schedule so there are no overlaps or conflicts in programming.
With Intermatic EJ500 and ST01C, event1 is the ON event and event2 is the OFF event, up to 40 events.

Add a comment if you hit trouble spot when programming.
Also fixya offers live phone support for a price.

Intermatic EJ500 with 7-day or dusk-to-dawn
Programming remains in memory forever, so you may only have to re-enter current time.
http://waterheatertimer.org/Flipdown.html

Intermatic ST01C with 7-day or dusk-to-dawn
http://waterheatertimer.org/ST01C-program.html

Intermatic EI500 7-day
http://waterheatertimer.org/Programmable.html#EI500

Aube timers are either dusk-to-dawn or 7-day
http://waterheatertimer.org/Aube-timers.html

Utilitec 0192773 with 7-day and astro dusk to dawn
http://waterheatertimer.org/Program-wire-Utilitec-0192773.html

Utilitec 0141224
http://waterheatertimer.org/Program-wire-Utilitec-0141224.html

GE 15071 - 15086 in-wall timers: one has daylight savings time
http://waterheatertimer.org/GE-timers-and-manuals.html

Woods 59018 in-wall
http://waterheatertimer.org/Woods-timers-and-manuals.html

Tork SS720 in wall:
http://waterheatertimer.org/Tork-consumer-timers-and-manuals.html

Dec 17, 2010 | Intermatic Inc. ST01C Digital In-Wall...

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

My switch has only a white wire (hot) and a black wire (neutral). Witch one dose the red wire connect to?


I answer questions for free
I specialize in timers and electrical devices
If you have a different timer than the one shown below, add a comment with your timer model and I will help.
Different timers use the red wire differently.

You posted under Intermatic ST01C.
If the ST01C is your timer, then the red wire is capped off.
The black-timer wire connects to black wire.
The blue-timer wire connects to white wire.

IF the timer does not work after wiring, then try reversing the blue and black wires.

The following photo shows the EJ500 timer which is wired exactly like the ST01C
http://waterheatertimer.org/images/EJ500-wiring-full.jpg

The following link shows several wiring diagrams for the ST01C and EJ500 timers
http://waterheatertimer.org/ST01C-program.html#ST01C

Nov 02, 2010 | Intermatic Inc. ST01C Digital In-Wall...

1 Answer

I have a EJ500. It turns on at evening but does not turn off at dawn


http://waterheatertimer.org/Intermatic-ej500c-manual.pdf

The astronomic settings are not correct. The instructions are long. Start with section 4 on page 2 of instructions. Clear programming, and then reprogram timer.

Aug 18, 2010 | Intermatic Inc. EJ500C Digital Wall Switch...

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