Question about Intermatic T104 24h 208-277v Mechanical Time Switch

1 Answer

T104 intermatic was replaced but will not turn on

Previous t104 timer was not working. Replaced with a new t104 and ran wires the same way but still will not power on.

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  • Terri Michaud Feb 14, 2012

    This timer is for an inground pool

  • Terri Michaud Feb 14, 2012

    OK update. The timer works now when I turn it on manually. I have attached the on/off trip levers but the problem now is that the timer clock is not rotating.

  • Gene Haynes Feb 08, 2013

    If the timer is new, then your wiring is wrong. If timer worked before, and wired is correct, then Replace WG1573 clock motor:

  • Gene Haynes Feb 08, 2013

    In addition to response above: Look on back of timer mechabnism to make sure clcok motor is WG1573 240volt. Then look at following wiring diagram (wire colors may be different) Then comment back.

  • Terri Michaud Feb 13, 2013

    I checked the wiring as the issue is that the devive trips the circuit breaker when it is turned on manually or by the timer. It turns off with no issue and will run once you reset the circuit breaker

  • Gene Haynes Feb 13, 2013

    If device trips circuit breaker, then 1) wiring is wrong or 2) amp draw from load exceeds circuit breaker size. SO: 3) What amp or watt load do you have? 4) What amp circuit breaker do you have?


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  • Intermatic Master
  • 5,089 Answers

Your wiring is incorrect -or- wire is not under the screw plate correctly -or- the 240Volt breaker is tripped on one leg.
Make sure that copper wire is under screw plate, and that no insulation is under plate keeping wire from making contact.
Open following link to double-check wiring:

Posted on Jun 16, 2012

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Posted on Jan 02, 2017

  • 1 Answer

SOURCE: I replaced my pool clock ( Intermatic)twice. still

I have the same problem with the t104 clock. wired exactly to the diagram. this is the second one, the first one i thought it was a defective timer so i replaced it with another t104 and also wired it exactly to the diagram and still nothing. am i not doing something right???? line 1 to 1, line 2 to 3.....

Posted on Jun 11, 2010

  • 33 Answers

SOURCE: replacing an old timer with a new gm40.

Here is the instructions for your unit:

Intermatic GM40

Go to page #4 for wiring instructions on 120v dual loads.

Hope this helps and please rate this!

Posted on Dec 09, 2008

  • 12 Answers

SOURCE: A t104 intermatic turns on and off sporadically

Replace the trip levers, I dont think your timer turns off and on without trip levers? Unless your outdoor fixtures have photo cells on them or wired to them! Are they coming on at night and shutting off at Daylight, if so they are connected to a photocell or have internal photocells which means you don't need the timer unless you want to control different on off times.

Posted on Jan 26, 2009

SOURCE: How to wire a intermatic timer T104 240 v to a

T104 is 240volt timer.
Timer has terminals A 1 2 3 4
T-104 clock motor must receive 240Volts to operate.
Clock motor wires are white-colored and can be seen connected to terminals 1 and 3.

There are two work-arounds for using T104 for 120V.

1) Diagram 1 showing how to change wiring:
Move 240V clock motor wires to terminal 1 and A.
Connect 240V Hot leads to terminals 1 and A. This will power the 240V clock motor
Hot wire going to 120V load connects to terminal 2. This wire will be turned on each time timer turns on, and 120Volts will power the 120V load.
To complete 120V circuit, neutral wire that comes from neutral busbar in breaker box connects to 120V load.

To control additional 120Volt circuit, run jumper wire from terminal 1 to terminal 3.
Connect Hot to second load to terminal 4.

2) Second method is to change T104 timer into T103 timer:
Replace T104 240V clock with identical 120V clock motor from Grainger
Neutral wires connect to terminal A.
Hot wire from Breaker connects to terminal 1
Hot going to Load connects to terminal 2

To control additional 120Volt circuit, run jumper wire from terminal 1 to terminal 3.
Connect Hot to second load to terminal 4.

Posted on Dec 27, 2010

SOURCE: the t104 comes new in

277V instructions say:
Move small white motor wires to terminals A and 1
Connect 277 Neutral wire to terminal A
Connect 277 Hot to terminal 1
See illustration:

Add a comment for more free help.
Also take advantage of fixya expert assistance live.
For a price, expert works with you while you work on timer or any do-it-yourself project.
Fixya is always less expensive than a service call.

Posted on Mar 04, 2011

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1 Answer

Good morning, problem began when timer stopped working at the pin "off" point. Figured a new timer was in order so replaced with a WG1573-5 (same as previous) Timer is T104. Now the problem, when the timer...

Did you buy new timer or new clock motor?
WG1573 is replacement 240v clock motor for T100 series timer.
T100 series is fully repairable and can be maintained to last decades. I've seen operable timer from 1950s.

You can convert T104 240Volt timer into 120V timer by changing clock motor to WG1570 to replace WG1573.

In any case, timer is wired wrong somehow since it seems to cut off one leg of the 240V circuit.
Copy following links for illustrations and troubleshoot and more information than you can use in decades:

More related information

Don't grind up your motor.
Connect direct to hot wires and run 240V.

Add a comment

Aug 22, 2013 | Hardware & Accessories

1 Answer

The clock on my paragon 4004-71m is not working

1) Clock motor has gone bad, but replacement clock motors are no longer made.
Copy following link for Paragon resources:

2) Paragon is not making parts or replacement motors.
4007-41 is 240Volt timer, replace timer with Intermatic T104

3) Crossover wiring from Paragon 4004-71 to Intermatic T104:
Paragon 1 to Intermatic 1
Paragon 2 to Intermatic 2
Paragon 3 to Intermatic 4
Paragon 4 to Intermatic 3
Intermatic terminal A is generally not used for 240Volt

4) Add a comment if needed

Jan 17, 2013 | Paragon Hardware & Accessories

1 Answer

Ti04 clock rotates and new trippers but doesn't turn on

You probably have T104 timer.
Clock rotates so power to timer motor is good. This means 240Volt breaker is good.
Use override lever and see if Load (light, fan, motor) turns on and off. If override does not turn Load on-off, then bypass timer and see if load works. Move wires from terminal 2 to terminal 1, and terminals 4 to terminal 3.
Did you order correct trippers?
Copy following links for Intermatic troubleshooting and Intermatic parts list.

Jun 28, 2012 | Intermatic T104 24h 208-277v Mechanical...

1 Answer

Hi! Please help me. I am having trouble connecting the wires from my dead 220v T104 pool pump timer to a new 220v T104 timer. The old timer had posts marked G 1 2 3 4. The new one has posts marked L 1 X...

Open following link for T104 wiring diagram:

Your new timer is L 1 X 2, so that is not Intermatic T104.
You might have GE/Tork 15061 that fits into Intermatic box.
First thing to check is if new timer is 240Volts to match old T104.

If new timer is 240V, then here is crossover:
"Old 1" goes to new L >> and notice that L and 1 are connected by brass bridge. If bridge is missing, add a jumper wire between L and 1 on new timer

"Old 2" goes to new 2

"Old 3" goes to new X
"Old 4" goes to new X

T104 Intermatic timer is SPDT single pull double throw, so it turns off both wires going to Load.
New L1X2 timer is SPST single pull single throw, so it turns off one wire going to Load, and that's why old 3 and old 4 both connect to terminal X.

If this is too complex, then add a comment or buy new trippers and a new WG1573 clock motor and repair T104 for $20.

Apr 22, 2011 | Intermatic T104 24h 208-277v Mechanical...

1 Answer

I had a T-104 timer installed on my water heater about 5 or 6 years ago. It is now starting to make a pulsing-type sound, but it does seem to be working okay otherwise. Is it something that could be...

The noise is from clock motor turning the gears.
When timer is new, parts have a bit of white grease on them.
Turn off power and spray WD 40 or apply some white grease.

The other possibility is that WG1573 240Volt clock motor is going bad.
Replace clock motor by tipping mechanism out using thumb spring located top inside box.
Buy clock motor and extra trippers from Granger:

Notice on image below, there is a bit of white grease on lever.
This photo is from new T104.

Feb 22, 2011 | Intermatic T104-20 Indoor Hot Water Timer

1 Answer

The spring that turns off the power in my Intermatic WH21 timer is broken. Where can I buy a new spring?

Parts are not available for WH21 240V water heater timer.
Timer has 1 year limited warranty.
WH21 is rated for 25Amps and works on water heaters up to 4500Watts.
Look at label on side of tank to see wattage.
WH21 is SPST and turns off one hot wire to water heater.

I ran a business for many years.
Cost of stocking, organizing, and shipping parts is near same cost as new timer.

Following page shows selection of replacement timers:

For example, I have tested WH40 and T104 and other timers that show on page.
Trippers and motors are available for Intermatic box timers WH40 and T104, so you can maintain these specific models for many years.
WH40 and T104 timers are SPDT and turn off both hot wires to water heater.
Both timers will work on any wattage residential water heater

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1 Answer

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?
Buy new trippers.

If clock motor does not work, and circuit is 240Volts, then I suspect you connected clock motor to wrong terminals>? Clock motor connects to terminals 1 and 3.

Add a comment and fill in details so we can properly troubleshoot.

Dec 04, 2010 | RTO Intermatic Inc Wg1573-10d Replacement...

2 Answers

I replaced my pool clock ( Intermatic)twice. still

I have the same problem with the t104 clock. wired exactly to the diagram. this is the second one, the first one i thought it was a defective timer so i replaced it with another t104 and also wired it exactly to the diagram and still nothing. am i not doing something right???? line 1 to 1, line 2 to 3.....

Mar 30, 2010 | Intermatic T104 24h 208-277v Mechanical...

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