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

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When timer reaches stop time, clock stops too.

I installed a T104 on my water heater, it ran perfectly for twelve hours but when it reached the shut off time of 8 am, it shut the appliance off and the timer clock stopped too. It seems to be wired according to instructions.

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The power incoming to the timer (known as LINE) must be on terminals 1 and 3 as this is where the clock gets its power from. The power leaving the timer going out to whatever you want to control (known as LOAD) should be on terminals 2 and 4. This way the timer motor has power all the time.
When the timer is on terminal 1 connects to terminal 2 and terminal 3 connects to terminal 4.

Posted on Jul 09, 2009

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Posted on Jan 02, 2017

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During this time of defrost you manually advanced into, Did the heater turn off them self? If they did the defrost thermostat does work, if the heaters stayed on the entire time (1hr) than the thermostat needs to be replaced as well as the timer. The thermostat is a cut off device to prevent the over heating of the freezer and liner (safety device). Think of a defrost timer as an egg timer, this timer runs regardless of function just advances like a clock. The thermostat turns off the heaters when they reach a temp rather then time. I hope this answered your question, good luck

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What position is lever on intermatic pool timer t104p3 for timer to work?


Lever automatically moves back and forth as trippers pass.
Move lever to ON position, move to the right.
If timer dial is not rotating, then check wiring, or replace clock motor:
If timer worked before and stopped working, but dial still rotates, the trippers are worn down, replace trippers:
http://waterheatertimer.org/How-to-operate-and-set-T104-timer.pdf
http://waterheatertimer.org/Buy-T100-series-timers.html#pool
http://waterheatertimer.org/How-to-wire-T104-Intermatic-timer.html#T104

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I installed a new T104 m for my pool pump. The clock works fine and it works fine manually. The on and off stops do not turn it on or off. The clock goes right past the on and off stops and they don,...


You installed new 240Volt T104 Intermatic timer.
Cause of problem is not determined, so read information below and then add a comment with further observations.

According to question:
Timer is wired correctly.
http://waterheatertimer.org/How-to-wire-T104-Intermatic-timer.html
The on-and-off trippers are installed on dial, but do NOT click the override lever back and forth.
Both ON and OFF trippers are on the dial.
And the timer is NEW and not used, and trippers are NEW and not used.
And the dial rotates and keeps good time, making 1 full rotation each 24 hours.
And the manual override lever works and turns load (pool pump) on-and-off.

Open following link to view photo image of OFF tripper coming in contact with manual override lever.
Trippers are soft metal, and made to wear down. When tripper gets old, it will slide over the lever instead of move the lever.
http://waterheatertimer.org/images/WH-lever-005-500.jpg
Open following link to read how to set timer, and see close-up images of timer with trippers on dial, and tripper order number for replacement trippers.
http://waterheatertimer.org/pdf/How-to-operate-and-set-T104-timer.pdf

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And take advantage of fixya expert assistance live.
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Sep 03, 2011 | Intermatic T104M 208-277Volt 40-amp Timer...

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

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

Notice on image below, there is a bit of white grease on lever.
This photo is from new T104.
geno_3245_290.jpg

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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.
http://www.intermatic.com/customer%20service/frequently%20asked%20questions.aspx
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:
http://waterheatertimer.org/Boxtype.html

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

http://waterheatertimer.org/How-to-wire-T104-Intermatic-timer.html
http://waterheatertimer.org/How-to-wire-EH40-hot-water-heater-timer.html

Feb 18, 2011 | Electric Intermatic Wh 21 Water Heater...

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How do you program this heater


temp setting
1. press the temp/timer button untill the temp icon blinks
2 use up and down arrows to set temp.3 the temperture icon will stop blinking and the current room temperture will appear after desired temp. is set.
4 the heat will turn off shortly after the desiredtemp. is reached and the temp. ndisplay will blink.
5 the heater will turn back on when room temperture drops below the set temp.

timer : auto -off press the temp/time button untill timer icon blinks. the hour display will apear. the auto off icon will also appear.

2. use up and down arrow buttons to set the heater operation time between 1 and 10 hours. this function will activate once the timer icon stops blinking.
3. the heater will automaticly turn off when time runs out.

set temperture first so heater will cycle on and off till shut down time reached

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I want to add an under-counter auxiliary water heater to my 15A dishwasher circuit. I need to install some sort of relay to cut out the water heater when the dishwasher is being run, to avoid overloading...


If I understand correctly you have 15 amp breaker with 14gauge wire.
Total watt capacity of 15 amp breaker is recommended at 80% rated load = 12 amps

You want to connect two appliances to same 15 amp line.
1) You have 6 amp Dishwasher that draws 720 Watts
2) You have under the counter water heater with 1500 Watt element that draws 12.5 amps.
3) Combined load is 18.5 Amps and 2220 Watts, approximately
So you do not want dishwasher and water heater turned on at same time.
Makes good sense.

Solutions:
> Easiest thing would be to put water heater on ordinary wall switch located inside sink cabinet.
Back when garbage disposals first came out, garbage disposal switch was inside sink cabinet. You opened cabine door and flipped the switch.
> Next solution would be to put water heater on a timer located under the sink. There are different timers. In-wall timers and box-type

In-wall timer would need relay/contactor
A battery operated timer like the ST01C would not need to be reset after power outage
http://waterheatertimer.org/Programmable.html
Here are instruction pages for selecting and installing the relay/contactor.
http://waterheatertimer.org/H230A.html
http://waterheatertimer.org/Install.html
Add a comment any time.

Box-type timer like T101 120Volt timer. This timer needs no relay/contactor.
http://waterheatertimer.org/How-to-wire-T104-Intermatic-timer.html#T101
Timer needs to be reset after power outage, but operates on ordinary 120V power, and is simple to install.

> There is no easy way to wire the dishwasher and water heater together so one is certain not to operate when other is turned on. There are likely electronic control panels for that project. But since you know the hours when dishwasher is likely to be ON, then set water heater timer to turn OFF during those hours. Water inside tank will stay hot for a couple hours, so there is no loss.

It sounds like you are a solid electrician.
If needed, add comment any time for more assistance.

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T104 clock stopped running. must now use switch


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May 10, 2010 | Intermatic T101R3 110 volt time clock in a...

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T104 clock stopped running. must now use switch


Yes, you can replace the timer motor to solve the problem. For the Intermatic T104 you'll need to purchase the 208/277 volt timer motor. Part number is WG1573.
http://www.aplussupply.com/intermatic/timer.htm

If you don't want to mess with replacing just the timer motor you can purchase a new timer and swap just the guts with the old timer as long as the existing enclosure is still in good shape.

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