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Pool Timer Switch with Transformer Intermatic T10004RT3

The yellow timer wheel does not keep time. I can pull it towards me to set the time but it will not keep time on its own. So I have to manually turn the switch on and off. Is there a simple solution without having to replace the whole unit?

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You need pull the interior out by pressing the clip on the top and pivoting it to release or removing the three small screws holding it in(depending on how old it is). I'm assuming it's an Intermatic brand by the yellow dial. The timer motor is bad. It will still run until it gets to the time clock trips, then it stops. It is held in by two small screws. The clock has a number in it for replacement. They run about $25. so it's cheaper than a whole clock, plus you dont have to change the whole thing. That's really all that can go bad on those. They are very dependable units.

Posted on Nov 26, 2008


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The circuit breaker can be used for transformer, or another outlet or nearby light etc, or it can be used for a T103 120 volt timer.
To trace the wire back to breaker box.... open you main panel and start turning off breakers one at a time and label the panel.
See if you have single breaker or double breaker supplying power to pool equipment.

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T104M used WG1573 clock motor:
The timer mechanism has metal gears, while the clock motor has plastic gears. If the metal gears get dirty and bind, it will strip the plastic gears.
Turn off power, pull timer out of box, Clean out timer with compressed air, and spray WD40, add a bit of white grease to lever where trippers make contact, then replace clock motor ... and buy another set of trippers to have on-hand since they are designed to wear down so timer will last longer.
If timer body is broken so dial does not rotate, then buy new T104 and snap new mechanism into old box. Buying whole T104 with enclosure is cheaper than buying T104M mechanism only.

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Question posted under T10004RT3 pool panel with transformer.

If the pool light inside the swimming pool is out, but bulbs are new, then those lights receive power from the transformer. Check if transformer is humming and putting out 12Volts ac.
Check that bulbs are rated for transformer output voltage.
Replace transformer with 119T340 or 119T267.

If the 120Volt lights are not working, then these usually turn on-off with a switch. Check the switch

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Intermatic phone number: 815-675-7076

T104RT3 has 120Volt 300 watt transformer with 12-13-14Volt output.

The timer mechanism is 240Volt T104M.

Since both 120Volt and 240Volt are needed, the wire coming from breaker box should have 2 Hots and a neutral, plus the ground wire.
So you need 12-3 with/ground wire or 10-3 with/ground wire.
See image of typical wires plus ratings:
See example image showing 2 hots and neutral and ground coming from breaker box:

The 2 hot wires come from a 240Volt circuit breaker.
The neutral comes from the neutral busbar, or can be accessed from tying into any white neutral on nearby 120Volt outlet.

How to wire timer:
Connect 240Volt hot wires to terminals 1 and 3 on timer. Connect 240Volt timed output to terminals 2 and 4 on timer.

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Connect 120Volt transformer two different ways. (a) white wire connects to neutral wire and black wire connects to terminal 1 on timer. With this wiring, the transformer is ON at all times. (b) white wire connects to neutral wire and black wire connects to terminal 2 on timer. With this wiring, the transformer will be ON when timer turns on.
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1) If this is new installation then timer is probably wired wrong.

2) If timer worked before and stopped working, and timer dial is rotating and keeping good time, sounds like you need set of 156T1978A trippers.

3) Open following link for timer troubleshoot and trippers:

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Order new T100 series 240V clock motor and install yourself using star-screwdriver.
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Notice also that link has tripper pins.
Trippers are made to wear out before timer mechanism.
Buy extra ones when ordering motor.

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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