Question about Intermatic T101 - 24 Hr. Dial Time Switch - NEMA 1 Indoor Steel Case - Gray

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Clock Stopped Turning

My timer clock on my pool has been working fine for the last 19 years, but now the dial won't turn. I have to start it manually and set the time. When I check it a few hours later, the time is still set to the previous time set and the dial didn't turn. Any ideas what cause this?

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Most likely, the timer motor has failed and needs to be replaced. As the timer motor is constantly running 24/7, getting 19 years of use is significant and is well beyond the typical life of a mechanical timer of this type. I know, I've got the same ones on my pool and usually have to replace them every 10-12 years.

As the timer IS 19+ years old, it would be best to replace the entire unit instead of looking to tyr to get just a replacement timer motor, since the cost for a new timer isn't all that much compared to the cost for just the motor.

Intermatic also makes a digital timer version of this type of timer, but for the relatively low price of a new, replacement mechanical timer, it might be a good idea to get another one like you have and expect another long working life.

Sorry that there really isn't much to repair in such an old timer, since the motor is the critical part.

The replacement should be easy to do yourself, just remember to turn off the power breaker and disconnect the power to the timer. All you need to do is exchange the wires into the new replacement timer I find that taking a picture of the timer as it is, will help you get the connections correct for the new timer.

Also, check the model number of your present timer and voltage, (some pool equipment is 100V-AC while others are 220V-AC) to get the correct replacment timer.

Hope you find this Very Helpful and best regards.

Posted on Sep 09, 2009

Testimonial: "Thanks. I took it apart and found the motor and replaced it for a cost of $35! Found out later the timer was install in 1979, 30 years of service!"

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2) Add a comment for specific help with wiring, and I will respond.
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Open following link to identify timer and see replacement clock motor and trippers:

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Crossover wiring from Tork to Intermatic:
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I have an intermatic T104P3 timer for my pool and now it won't turn on. I have to start the pool on manual. I have tryed to remove the screw to start and it goes right by it and does not set the pool on....

Hi Dianna, I am timer expert at Fixya

1) When you say screw, I believe you mean tripper?

2) Trippers are placed on dial using thumb screw. Clock motor located on back of mechanism rotates dial. So dial rotates as time passes.
On-off trippers rotate around on the dial and push a lever back and forth that turns pump on-off.
Trippers are designed to wear down so that timer mechanism lasts longer.
You can buy replacement trippers for T100 series timers at Grainger:

3) You posted under T104 timer.
Notice that grainger also sells WG1573 240Volt clock motors for the T104.
Clock motors slow down and burn out.
Clock motors are replaced by tipping mechanism out of box using thumb spring located inside box at top. Clock motor is attached with 2 small star screws. Buy star screwdriver at auto parts or hardware.
When ordering trippers, you might want extra clock motor on hand for when the dial stops rotating.

4) Open following link to see manual and wiring instructions for T104.

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My Intermatic timer is not working. I replaced the WG1573-10D motor but still it does not work. The manual override works so the power supply is ok. Any suggestions welcome.

Your question doesn't provide enough information.

You have 240Volt T104 Intermatic timer?
A) WG1573 is for 240 volt timer. If you have T101 or T103 timer, it takes 125V clock motor.

B) This is new installation? and clock motor only worked when override was ON, so you bought new clock motor. But actual problem is that wires from Load and Breaker are reversed.

C) Your timer worked fine in past years, but dial stopped rotating so you bought new clock motor?
You replaced clock motor.
Manual override works.

--And then your information ends.
Does clock motor work? Does the dial turn? Are your on-off trippers on the dial?
Are tripper worn down?
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The clock has stopped. I have to turn it manually. Its an outdoor timer with a cover.

If the clock dial does not rotate >> and the manual override works >> the the clock motor is bad.

The clock motor is replaceable. Snap out the insides, and the clock is attached with 2 small screws >>> sometimes these take a start screwdriver from the auto parts store.

On the inside cover of your timer is a sheet showing the clock voltage. Some clocks are 240 Volts, some are 120 Volts.

The back of the clock also has identifying numbers.

You say the timer is outdoor. A pool timer is probably 240Volt timer, with a 240Volt clock.
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Grainger sells 120 and 240 clocks for the T100 series timer

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Things to check:

1) Is yellow dial rotating? If not, then clock motor is probably bad. T-100 240V time clock motor sells for $16 at grainger.
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2) If clock motor is turning, but manual override never clicks on-and-off, then pins are probably worn out. Buy pins at grainger

3) Does manual override work? Does it click crisp? If manual override clicks crisp on-and-off, and pool filter turns on-and-off normally, then a) the circuit is getting 240V and b) the timer mechanism is ok ... so clock motor is probably bad.

4) If manual override snaps crisp but pool timer does not turn on, then then circuit breaker could be bad, wire is loose, motor has gone bad
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Note: Do not buy T-101 or T-103 as these have 120V motor.

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