Question about RTO Intermatic DT300CL 8.3 Amp Seven Day Indoor Digital Timer, White

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I have an Intermatic model DT 17 7day timer and I need a manuel to show me how to program it to turn on and turn off?

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First some of these were recalled, see link.

The instructions for a 17C should be the same.

Posted on Oct 13, 2010


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1 Answer

Lost manual for Intermatic DT 17.

1) Copy following link to identify timer and download manual:

2) Add comment and describe timer in detail

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I have intermatic model ET70115c timer would like programing example so i can program our buildings lights, on, off 7days a week sametime .no holidays.I must be doing something wrong ,need example to...

I recommend calling Intermatic.

Timer prompts user through the set-up and programming.
The manual does not show exact steps.
Example programming on page 17 of manual does not show how to set timer for 'fixed' 24-hour operation, with specific on-off set times

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I have an intermatic 7 day all weather timer model HB71R.I have lost the owners manuel.Anywhere I can print one off as it has to be re-programed.

Intermatic does not show that manual.

Intermatic manuals:

They show HB77R raintight.
This model may be close enough to figure out button sequence.
I work with timers and most programming follows similar pattern.
Older timers usually follow same pattern as new timers, except with fewer options.

Nov 16, 2010 | Intermatic 7 Day Digital Timer Model...

1 Answer

I have digital programmable timers (Model DT121 and Model DT11) that will accept programs, but won't turn the attached lamps on and off at the programed times. The batterys are new and I've had them...

DT121 Manual

All Intermatic manuals

Intermatic does not show DT11
Intermatic shows the DT121 is no longer available

If the display shows and you can set programs, then the battery is good.
Does the manual override work? This indicates whether the timer on-off switch operates.
If manual override does not work, then I discovered that timers are no longer any good

Set present time
Then set ON time for program 1
Set OFF time for program 1
Then set ON time for program 2
Set OFF time for program 2
Most timers will not function if there is a conflict in programming > for example Program 1 says ON at 6 and OFF at 7 and Program 2 says opposite or has overlapping times
When events are set, press SET once > this will put timer in RUN mode

If manual override works, and you set programming correctly, but timer does not carry out instructions, I guess the timer is no good.

Intermatic has 24 hour timers with 2 on-off per day
Intermatic has 7-day digital timers (all digital timers today are 7 day where you select the day that each program works)

Oct 12, 2010 | Intermatic Hardware & Accessories

1 Answer

My son lost the instruction manual for our DT 500 CH self-adjusting timer made by INTERMATIC INCORPORATED, and we can't even figure out how to turn it on, let alone program it. Any help would be great!...

I Just downloaded the pdf for the same model. The link to Intermatic is

If that doesn't work then google Intermatic DT500CH pdf and select the return from Intermatic. It's a good timer but not intuitive. I had to look up the manual just to change from daylight savings time.

Dec 24, 2009 | RTO Intermatic DT500CL 10 Amp Indoor...

1 Answer

Intermatic Model DT 121 "LO" after programming

That is the visual indication for a "LO" battery. You need to replace the battery very soon or the timer will cease working properly.

Typically with this model of Intermatic timer, you only have about 30-40 seconds to change out the battery before the programming is erased and you'll have to re-enter your desired on/off cycles and such.

The battery is located under the manual push faceplate, just flip it down and you can either use a small flat bladed screwdriver or your fingernail to open up the battery compartment to change out the battery.

Hope you find this Very Helpful and best regards!

Aug 25, 2009 | Hardware & Accessories

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