Question about RTO Intermatic T104R3 Timer Switch 220V - Metal Enclosure

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I'm trying to install an Intermatic T104R3 for my pool. What is the difference between line and load? Do you have a picture of how the wires should be connected?

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'Line' means 'power in' and 'load' means 'output' to the device you want to control. Hook you power in 'HOT' wire to line and your 'load is the wires going out to the motor or lights or what ever. Follow the diagram on the door.

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Posted on Jul 02, 2009

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Does the timer have to be grounded to the panel?

Posted on Dec 03, 2009


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1 Answer

How to wire an intermatic t174 with a W433-1 TIMER FOR A 220 VOLT MOTOR

Verify that the clock motor is 220v. On the posts where the supply wires (line) and pool motor wires (load) they should each have a post for each of their two wires. If you do not have four posts, this is NOT a 220v timer.

Jul 11, 2014 | Intermatic T174 24 Hr 40 Amps Timer Switch...

1 Answer

Timer will not turn off

Question posted under Intermatic T10004R pool control center.

If installation worked before:
Might be worn 156T1978A tripper.

If this is new installation:
Might be wired incorrectly. Wires from breaker confused with wires from Load.

If you need further help, I’m available over the phone at

Sep 29, 2012 | Intermatic T10004R - Pool-Spa Mechanical...

1 Answer

Pool time switches pool on, but off does not trip off, and can't do it manual. When I push it on off, the pool pump tries to stop but continutes running. Have to use breaker box.

Model number of timer is not known.
Is this new installation? Or installation that worked before and recently stopped working?
If the manual override lever on timer does not turn Load on-off, then 1) wiring is wrong or 2) timer has gone bad or 3) pump has a short.
I suspect a short since you say the pump 'tries to stop running.'
Copy following links for troubleshoot walk-thru, and correct wiring:

If you need further help, I’m available over the phone at

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

1 Answer

T104R3 Timer moving but automatic turn no longer works I mistakenly released the pointer metal (should not do that) and reattached it, probably pointing to different time. the clock is working, but...

Replace trippers.
If timer dial is rotating and keeps good time, and manual override turns load on-and-off, then replace the trippers.

Stationary pointer points at 6:00 and moving it does not affect timer function.
The pointer is reference point for setting current time.

Other resources:

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Oct 02, 2011 | RTO Intermatic T104R3 Timer Switch 220V -...

1 Answer

How do I program this timer?

T104R3 is ordinary 240V T104 timer mechanism inside a beige metal weathertight enclosure.
Put ON-OFF trippers on dial, lift and rotate dial until current time lines up with silver pointer.
Reset current time after power outage.
Open following links for T104 Instructions:
Open following link if you have T104R201 with fireman's switch

Jun 23, 2011 | RTO Intermatic T104R3 Timer Switch 220V -...

1 Answer

Hi expert: I am installing intermatic P1353me digital pool or spa mechanism and having trouble to figure out how to do this heater Firemen Switch connection. My existing pool timer is T104 and there were...

1) Fireman's switch automatically turns off heater few minutes before turning off pump.
Not all pool timers have fireman's switch.
If old timer did not have it, then don't worry about it.
P1353 has wires marked for fireman's switch, so simply don't use them if you don't want to.
page 21 of manual shows wiring for fireman's switch.

2) T104 and P1353 comparison
Difference 1: T104 turns OFF both hot wires, while P1353 turns Off 1 hot wire.
Difference 2: T104 controls 1 240V load with 1 time schedule, while P1353 controls 3 different 240V loads, each with different time schedule.
Check that wire(s) coming from breaker can handle all 3 loads.

3) 240Volt T104 is wired as follows:
Hot1 from breaker connects to T104 terminal 1
Hot2 from breaker connects to T104 terminal 3
There is constant power on terminals 1 and 3, each terminal has 120V when combined makes the 240V circuit.
Load1 wire connects to T104 terminal 2
Load2 wire connects to T104 terminal 4
Terminals 2 and 4 have power whenever timer turns ON

4) Definition:
In electric wiring, Line means power from breaker, and Load means wire going to light,fan, motor, pump.

5) Converting T104 to P1353
Hot1 from breaker connects to P1353 terminal 1
Hot2 from breaker connects to P1353 terminal 2
This will power timer electronics and timer clock and switches.

Jumper wire is placed from Hot1 at terminal 1 to each Line terminals 3 5 and 7.
This will put power at the switch, and when switch turns ON, then power will flow from Line wires to Load wires and then on to the Load.
Load 1 connects to terminal 4, Load 2 connects to terminal 6, Load 3 connects to terminal 8
To complete each 240V circuit, Hot2 is connected directly to each Load.

6) You say 'salt' system connects to terminals 1 and 3 on T104, then those wires are carrying constant 240V to that device. So Salt system connects to terminals 1 and 2 on P1353

7) Get a second opinion:
I frequently contact Intermatic for various problems.
P1353 is fairly new product, and manual is long, and I might not fully understand your problem or wiring.
Intermatic answers their email.

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.

Jan 28, 2011 | Intermatic Digital 3-Circuit Timer...

1 Answer

My pool pump timer - intermatic, model #T104R3. was running fine. but 2 weeks ago we noticed it stopped clicking on. then we noticed it was running counterclockwise. is there a way to change it to run...

replace it, I would get the same brand cuz they are so reliable and simple to use. if you need help hooking it up just give me a holler. not sure how u do it tho so

Aug 07, 2010 | Intermatic & Indoor/Outdoor Rain Tight...

2 Answers

I set my T104R3 on and off clips to desired times and turned the timer on. At set time the timer went off, but the clock stops and does not continue and turn on at the desired time.

The T104 timer is miswired when it does things like that. The 240 volt clock motor is internally connected at the factory to terminals 1 and 3. That means that one of the incoming (line) 240 volt wires (pick one) _must_ be connected to terminal #1 and the other _must_ be connected to terminal #3.

The outgoing (load) 240 volt wires are connected to terminals 2 and 4.

The Intermatic wiring diagrams leave a lot to be desired. I wrote the following tip to help clarify intermatic T103 and T104 timer wiring, I hope it helps:

Feb 27, 2010 | RTO Intermatic T104R3 Timer Switch 220V -...

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