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How to open an Intermatic outdoor electrical outlet?

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Try intermatics website for instruction manual

Posted on Oct 13, 2018


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Posted on Jan 02, 2017



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SOURCE: 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

Posted on May 24, 2009



  • 704 Answers

SOURCE: intermatic outdoor can't reprogram. display reads NoOp

Les, First thing to do is to change the battery and see if the timer will allow you to reprogram it. Sometimes these timers will fail, as some models have a known history of failing fairly often.

NoOp, means non operating within the Intermatic line of electronic timers, so in order to see if the unit has failed or is just malfunctioning, due to a weak battery, remove the existing battery and install a fresh, new one.

You can remove the existing battery by flipping down the front switch panel and removing the battery tray with either your fingernail or a small flat bladed screwdriver. As your timer is showing the NoOp, you don't have to worry about losing your programmed on/off cycles, so you can take your time. Normally, if you're changing the battery, you get about 30 seconds to do this with some models of Intermatic timers, or you'll lose the settings. The newer models store the program regardless of how long it takes to change the battery.

Once you've replaced the battery, press the Reset button on the timer and allow it to refresh. If the NoOp is gone, just reprogram the timer with your on/off cycles and days and you're back in action. If the timer doesn't clear, you'll likely need to replace it, as it could be damaged and will not be able to be programmed again.

Usually, changing the battery and resetting the timer works about 60% of the time for me, as I've installed thousands of the various Intermatic timers in customer's homes over the years.

Hope you find this Very Helpful and best regards!

Posted on Sep 09, 2009

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Intermatic HB77R Power Switch Problem

HB77R is discontinued timer.
If reset and battery change will not restore functionality, then replace timer with HB800RCH lifetime timer, or HB880R outdoor timers:


If you need further help, I’m available over the phone at

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Need intructions for a noma outdoor electric timerWhat's your problem?

Open following links to possibly identify NOMA timer and download manual:
NOMA is old logo that was once used by Intermatic, and is now used by many different manufacturers to identify their product as a timer

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On sa 210, when timer off (either from program or manually switched off) correct "bulb off" status is displayed on the indicator, but the power doesn't go off from the outlets. this problem...

Most digital timers can be restored by resetting timer and then reprogramming.

Sylvania tech support: 888-548-4484
Sylvania timer has 1 year limited warranty.

Sylvania timer can be used for 1000W incandescent Loads and Motor loads up to 1/4Hp
All outdoor timers are susceptible to power surge from nearby lightning.
Timers are also affected by line noise and incorrect outlet polarity.
Test outlet with circuit analyzer. Use timer to control different Load on different outlet.
If more than one timer has same problem, then suspect can be line noise and outlet polarity.

Heavier-duty Intermatic HB8800RCL timer has limited lifetime warranty, and controls 1800 watts and 1/3 HP.

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Please send me manual for the model hb88rc to program the timer i lost mine our site, is i will appreaciate so much my name alberto chviech thank you.

Open following links for timer manual and see lifetime replacement model for discontinued HB88RC
This timer is reset by removing battery.
If functionality is not restored with battery replacement, timer has gone bad. Try timer on different outlet, and with different Load. Test outlet with circuit analyzer.

You have nice website.

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1 Answer

Had to change battery. Since I did this the day will scroll several times and will not let me set the day, nor the time, nor the mode. Is my unit toast ?? As it was working till I changed the battery.

Most digital timers suggest resetting as last-step effort to restore functionality.
This particular timer is reset by removing battery.
Try removing battery again. Otherwise it seems the timer has gone bad.
HB88RC is discontinued product.
Replacement is heavy-duty Intermatic HB800RCL 2-outlet or HB800RCH 1-outlet timer.

Less expensive and less reliable timer Woods 59403 with 1-outlet has quite a few 'timer won't work' questions on fixya.

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1 Answer

How do I wire a double pole double throw 240 volt ge intermatic timer to 4 240 volt plugs?

You posted under GE timer, but added the brand name Intermatic.
GE and Intermatic timers are totally different.
Wiring below is for GE and will not apply to Intermatic.

Step 1) lets cover basic GE timer wiring for 240Volt load.
Be sure to set dip switches BEFORE applying power.
Step by step illustrations show on following link.

Step 2) Load wires exit GE timer.
There are two Hot wires and 1 bare ground wire.

Step 3) Wire the outlets: You have 4 240Volt plugs.
This could mean a receptacle-type outlet like a clothes dryer outlet or air conditioner outlet.
Or it could be a twist-lock receptacle or extension-cord-type stage plug.
In all cases, look at screw color on device.
Connect Hot wires to brass colored screws.
Connect ground wire to green screw.

Step 4) Calculate total Load
Manual appears below: Look at Normally Open contacts. These contacts turn ON when timer turns ON.
Total load on all 4 plugs cannot exceed 2 HP
Generally, a 30 amp timer is rated for max 24 Amps or 6 amps per each of the 4 plugs.
Volts x amps = watts.
Take total watts and divide by 240Volts to get amps.

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.

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