Question about Intermatic T104M 208-277Volt 40-amp Timer Switch-Double Pole / Single Throw

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Clock does not work to turn pool filter on and off. do I need a new timer mechanism or clock motor

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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.
Also timer may not be getting 240V so check manual override.

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
Test for 240 across poles 1 and 2
... or timer contacts are worn out & you need new T-104
See back of mechanical timer

5) If manual override is loose or sluggish, then you need new T104. You can buy a T-104, T-104R, T-104M etc ... and the interior body will snap into old box.

Note: Do not buy T-101 or T-103 as these have 120V motor.

Posted on Sep 29, 2010

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Pool pump clock


T104M used WG1573 clock motor:
http://waterheatertimer.org/How-to-troubleshoot-Intermatic-timer.html
http://waterheatertimer.org/How-to-replace-Intermatic-clock-motor.html
http://waterheatertimer.org/Intermatic-trippers-and-parts.html#T100
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.

May 15, 2013 | Pool & Spa

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Pool pump starts randomly (as if there is a short) even when it is not set to start and stop. Otherwise works fine, not sure if I need to replace unit or dissassemble and clean or ????? T21004R


Sounds like 240Volt WG1573 clock motor has gone bad and needs replacement. But more checking is needed.

You posted under T2100-4R which is 60 amp Intermatic control panel with a single T104M 240Volt timer mechanism.
All Intermatic timer mechanisms can fit into same control center, so you can possibly have different timer mechanism inserted into the T2100-4R control center.
The control center can have up to 4 circuit breakers.
Instruction manual shows that timer can also have fireman's switch that is wired to pool heater and causes pool heater to turn off 20 minutes before pool pump turns off.
http://www.poolandspacontrols.com/products/mechanical%20controls/60%20amp%20pool%20and%20spa%20control%20panels.aspx

(1) First thing: If you have T104 mechanism, do a troubleshoot run-down to see if trippers, clock motor, or wiring are suspect:
http://waterheatertimer.org/How-to-troubleshoot-Intermatic-timer.html

(2) Next would be to check the circuit breakers for loose wires, burned connections, or the smell of burning or crackling sound that says breaker is loose on the busbar.

(3) Check for loose wiring on T104 and test circuit:
http://waterheatertimer.org/How-to-wire-T104-Intermatic-timer.html
(a) Push the manual override lever to OFF position and test across terminals 1 and 2 and then across terminals 3 and 4 to make sure timer is turning off power to pump. Both tests should show 0 volts.
(b) Push manual override lever to to ON position and repeat test above. Both tests should show 240 volts.
If the test fails, then buy new T104M timer mechanism.

(4) If the T104 timer is turning off both lines in the 240Volt circuit, then pump cannot turn on since neither wire is Hot.
However if your T104 timer is actually a T101 timer or if timer has different wiring, where timer is turning off only 1 leg and not both legs of 240Volt circuit, then pump has one hot wire available and a short to ground could cause pump to turn on unexpectedly.

Jul 08, 2011 | Intermatic T21004R- Pool-Spa Mechanical...

1 Answer

Pool timer turns filter on, then off as requested but 15 minutes later it turns itself back on again, as if the off was not complete. Do the metal dogs (on / off setters) wear out?


Yes that is what is happening.
The tripper is designed to wear down and preserve timer mechanism.

Your tripper is pushing lever part of the way over causing contacts to open.
After tripper passes, the lever goes back and contacts close.

Buy new trippers at Graigner:
http://www.grainger.com/Grainger/timer-accessories/timers/electrical/ecatalog/N-8hi
Notice also that Grainger sells clock motors.
Clocks are also replaceable.
T104 uses WG1573 240V
T103 and T101 use WG1570 120V
Tip mechanism out of box using thumb spring located inside top of box to see number printed on clock motor

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Also take advantage of fixya expert assistance live.
For a price, expert works with you via e-mail while you work on timer or any do-it-yourself project.
Fixya is always less expensive than a service call.

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Feb 20, 2011 | Intermatic & Indoor/Outdoor Rain Tight...

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The timer clock stopped working. I can only turn my pool pump on by the timer manually. Can it be repaired or do I need to purchase a new one?


1) You posted under T104 240Volt timer.
If I understand correctly the dial is not rotating, but manual override works fine.

2) Buy new T100 series WG1573 240V clock motor from Grainger
Also buy extra trippers since trippers wear down.
http://www.grainger.com/Grainger/timer-accessories/timers/electrical/ecatalog/N-8hi

3) Clock motor is located on back of timer mechanism.
Tip mechanism out by releasing thumb spring located top inside box.
Check motor number before ordering.
For example T103 timer looks the same as T104, but clock voltage is 120V.
Motor is held by 2 star screws > buy star screwdriver at auto parts or hardware.
On T104, the motor is connected to electric terminals 1 and 3.
T103, the motor is connected to terminals A and 1.

4) If you have different Intermatic clock motor, check links below:
http://www.aplussupply.com/intermatic/timermotors.htm
http://www.electricsupplyonline.com/prod/intermatic-motors.php

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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.

Feb 13, 2011 | RTO Intermatic T104R3 Timer Switch 220V -...

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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?
geno_3245_273.jpg

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:
http://www.grainger.com/Grainger/timer-accessories/timers/electrical/ecatalog/N-8hi

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.
http://waterheatertimer.org/How-to-wire-T104-Intermatic-timer.html

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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.

Feb 10, 2011 | Intermatic T104 24h 208-277v Mechanical...

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I have two 220 Intermatic time clocks in a raintight box operating a pool pump and a sweep (cleaning) pump for my pool. The clock motor quit operating--it is an Intermatic WG1573 5 60Hz 3W. The front of...


1) Order 240V T100 series clock motor.
http://www.grainger.com/Grainger/timer-accessories/timers/electrical/ecatalog/N-8hi
http://www.amazon.com/Intermatic-Clock-Motor-Leads-WG433-20D/dp/B0031DOHLG

2) Order extra trippers too since they are designed to wear down so they don't damage tripper lever.
Put dab of white (bicycle) grease on the tripper lever.

3) Turn power off.
Mechanism snaps out using thumb-spring located inside box at top.
Clock motor is held with two star-screws. Buy bit at auto parts store.
Clock motor wires attach to terminals 1 and 3
Reattach terminal screws very tight against copper wire and make sure wire-insulation is not caught under screw clamp.
http://waterheatertimer.org/How-to-wire-T104-Intermatic-timer.html
To re-set current time, lift and rotate dial until current time lines up with silver pointer.

4) See next generation of Intermatic pool timers that snap into same box.
New timer controls 3 separate circuits with different schedules for each circuit, so the single timer can replace both mechanical timers. Wiring is complicated, programming is complicated. I am still reading the manual, and it makes sense to me, so you can trust fixya to help in event that you replace your timers next ten years.
http://www.amazon.com/dp/B001DSEC7A/ref=asc_df_B001DSEC7A1417045?smid=ATVPDKIKX0DER&tag=dealt581-20&linkCode=asn&creative=395093&creativeASIN=B001DSEC7A

5) 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.

geno_3245_269.jpg

Feb 04, 2011 | Intermatic T10404R - Two 220 time clocks...

1 Answer

My pumps won't go off when the timer says it should. It just keeps running. I have to throw the breaker to turn off the pumps.


Does the manual override turn Load ON-OFF? If manual override is broken or doesn't operate, it may be time to buy new timer mechanism and snap into existing box.
http://www.amazon.com/dp/240Volt-20
http://www.grainger.com/Grainger/INTERMATIC-24-125V-Hour-Dial-Timer
Do timer dials rotate as time passes? Do dials keep proper time? If not, you need new clock motor. Grainger sells clock motors and trippers:
http://www.grainger.com/Grainger/timer-accessories/timers/electrical/ecatalog/N-8hi
Are the tripper pins still attached to the dial? If tripper pins are worn down, they need replacement.

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Also take advantage of fixya phone service.
For a price, fixya expert speaks with you over phone while you work on timer.

Jan 05, 2011 | Intermatic PF1202T - Pool-Spa Freeze...

1 Answer

Clock Stopped Turning


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.

Sep 09, 2009 | Intermatic T101 - 24 Hr. Dial Time Switch...

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