Question about Intermatic & Indoor/Outdoor Rain Tight Timer

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My timer is loosing approximately 3 hours a week.

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If I understand correctly, you have a box-type timer.
The brand of the timer could be Intermatic timer or another brand.
The timer has a dial
The timer dial is not keeping up with current time.
The timer functions correctly otherwise and turns the Load on-and-off.

There are a few reasons that can cause this.
1) The clock motor is bad, and needs to be replaced.
-Answer back with the brand and model of timer and we can look up a source for your specific voltage clock.
2) The gears are rusty and dirty
-Turn off power and lift mechanism out to inspect condition.
-The timer is bad and needs to be replaced.
-With some timer models, you can buy new timer and swap insides without changing box.
-Answer back with brand and model if you need help locating replacement.
3) There is a power interruption, for example a loose wire or bad breaker.
-If the clock is off by 3 hours exactly each time, then power interruption is NOT the best suspect.
-If the clock is off 3 hours this week and 1 hour next week, then electric problem is a better suspect.
-If the timer clock does not have power, it stops running
-If there is a loose wire at the timer then clock may stop now and then
-If there is a loose wire at the breaker or a loose wire somewhere between breaker and timer, then clock could run slow.
-If breaker is loose on the busbar, then there would be a burned smell inside the breaker box

Please answer back as you narrow down the cause. We will be glad to help more.

Posted on Oct 24, 2010


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Spray WD40?
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Problem #1. On model #DT300 the instructions under Set Time of Day # 3 does not change the day. The only place I can get the day/s to change is under the programming. What is wrong with it. I have...

Thank you for very clear question, and timer identification.
1) I don't have repair for defective timer.

2) Choose DT300 format
#3 says to press-and-hold CLOCK button until display shows 24H or 12H
Then release CLOCK button.
Next press HOUR button to select either 12H or 24H
This lets you choose am-pm format -or- choose military-time format where 11pm is 23

3) Set current time
Press-and-hold CLOCK button throughout whole current time setting.
Do not release CLOCK button until current time settings are finished.
Next, press HOUR button, and then MINUTE button, and then DAYS button until current hour, minute and day display.
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4) How to set DT300 timer program for full week of operation.
Each program requires you to set program 1 ON time and program 1 OFF time
Be careful to avoid program conflicts and overlaps so timer works as expected.

For program 1 ON time, you press PROGRAM button until 1 and ON display.
Release Program button.
Then select hour, minute and days. In this case you want all days of week, so you keep pressing DAYs button until whole week displays: Mo Tu We Th Fr Sa Su

Then you set program 1 OFF time, you press PROGRAM button again until 1 and OFF display.
Release Program button.
Then select hour, minute and days. In this case you want all days of week, so you keep pressing DAYs button until whole week displays: Mo Tu We Th Fr Sa Su

If you set ON time for all days of week, and OFF time for Tu Tuesday, then timer will not work correctly.

5) Read manual and add a comment for additional help

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GE 15117 manual

You might try a new AA battery.
Some guy wrote in this week and said he bought 6 timers and all the batteries were bad except 1.

Some timers, like Woods TD1300, and others have the 12 hour or 24 hour option.
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But GE 15117 manual says nothing about this option.

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