Intermatic T103 Indoor 120-Volt 40-amp Timer Switch-Double Pole/Single Thro - Answered Questions & Fixed issues

that should work no problem , but do make sure its only a gfci model not a combo acfi/gfci as with a mechanical timer the acfi is gonna misinterpret the switch closure and shut the power off

ohh and do remember just because the timer is rated at 40 amps and your feeding it with a 20 amp gfci doesn't mean it will work too 40 amps !!

Intermatic T103... | Answered on Jul 20, 2016 | 193 views

The timer may be working, but the switch has failed. This is a common failure of electro-mechanical timers.

Intermatic T103... | Answered on Mar 10, 2016 | 88 views

You should be able to find a wiring here. Search you should have a white, red, black, wire there. hook the white to the neutral or common. then hook the black wire to term # 1 the red wire to term # 3 and then hook the load side to term 2 and 4. it should work doing this. don't forget to hook up the ground. hope this was helpful. contact me if u need more help

Intermatic T103... | Answered on Mar 03, 2015 | 88 views

Remove trippers from dial


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

Intermatic T103... | Answered on Aug 13, 2014 | 73 views

Jan 2013. Yes very experienced. Multiple issues. Bad thermostat. Burned contacts on timer.
Let's break it down.

1) Water heater tripped:
29th the electric water heater reset button was tripped because ECO detected high heat from very-hot-water, or nearby burned wire, or loose wire, or bad thermostat.

2) Description of water heater:
40 gallon Rudd (Rheem), 2 thermostats and 2 elements indicates ordinary 240Volt water heater.
More information shows on label on side of tank, including valtage rating (208-240), and element wattage (usually 4500 watts).
Rheem-Ruud serial number, 3rd and 4th digit are year of manufacture.

3) Solution for water heater:
Tripping ECO reset button, Very hot water, and sometimes not-so-very-hot ... sounds like bad thermostat, and/or bad element. Replace both thermostats, and see if problem persists. Then replace elements if needed.

4) Information about timer:
Water heater circuit has 40 amp T103-Timer, which is plenty heavy for ordinary 240Volt household water heater that draws 19-22 amps.
T103 timer has repair parts, and can usually be repaired unless overheated contacts caused melting, but that can also be worked around in some circumstances, or the internal mechanism replaced by buying T103M mechanism-only and snapping into existing box.

5) Solution for timer:
Attach photo of inside of T103 timer, and I can assess what steps will most likely fix the timer.
Maybe the timer is not connected to water heater.

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

Intermatic T103... | Answered on Jan 03, 2013 | 220 views

1) Copy following link for Intermatic tripper resources:

2) Add comment and include model number of timer for best possible help identifying tripper.

3) If you have different brand timer, then include that brand and whatever identifying information you can see

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

Intermatic T103... | Answered on Dec 28, 2012 | 80 views

The wiring diagram for that timer is somewhat misleading. The 120 volt clock timer motor is connected internally to the "A" (neutral) terminal and the #3 terminal. The "A" (neutral) terminal is to the immediate left of the #1 terminal.
Here's how to do the wiring for your use, (assuming a 120 volt supply circuit and a 120 volt lighting or other load):
Connect the incoming power (line) black wire to terminal # 3. Connect the incoming (neutral) white wire to terminal "A".
Connect the outgoing (load) black wire to terminal # 4.
Connect the outgoing (neutral) white wire to terminal "A".

Intermatic T103... | Answered on May 19, 2012 | 492 views

T103 timer is operated with 120Volt AC power.
Open following link to identify correct wiring and identify timer.

Intermatic T103... | Answered on Oct 06, 2011 | 78 views


Click here for the instruction manual for your timer...

I would also print it is easier to read and you can keep it for future reference...


Intermatic T103... | Answered on Sep 18, 2011 | 45 views

according to your post you have a T 103, here are the specs on that model , if you need anything else, Just reply to this feed and I'll assist you with any questions you may have

Intermatic T103... | Answered on Sep 07, 2011 | 55 views

1) T103 is 120Volt timer that can control multiple loads and different voltages..
If new timer dial stops turning after the tripper passes, then wiring from circuit breaker is probably reversed with wiring going to pump.
Open following link to identify correct wiring:

2) Add a comment for specific help with wiring, and I will respond.
Give details of pump voltage, and description of each wire.

3) To fix old timer, Replace 3-watt, 120Volt WG1570 clock motor.
Open following link for illustrations showing how to replace clock motor:

4) Take a moment and rate answer:
And 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.

Intermatic T103... | Answered on Sep 05, 2011 | 136 views

The wiring might be wrong, or the Load is shorted out:
T103 has 120Volt clock motor and can be wired many different ways.
Open following link for wiring diagrams, and then add a comment for discussion of your specific wiring:

Intermatic T103... | Answered on Aug 22, 2011 | 142 views

Intermatic T103 is mechanical timer with moving gears.
Timer makes audible sound when tripper clicks on-off, but it should not make constant noise unless gears are causing noise.
Turn off power and spray WD-40 on gears and see if problem continues.
WD-40 vapor is extremely flammable hydrocarbon when sprayed, and should not be sprayed on live electric circuits.
If problem continues, turn off power, pull mechanism out and spray WD-40 on plastic gears of clock motor.
Open following links for illustrations of clock motor and removing mechanism.

Intermatic T103... | Answered on Aug 12, 2011 | 405 views

Open following link for T103 troubleshoot:
Check that the dial is keeping correct time, you might need new WG1570 clock motor.

Intermatic T103... | Answered on Jun 19, 2011 | 62 views

Sounds like timer is wired wrong, and cable from breaker is reversed with cable going to load
Open following links:

Intermatic T103... | Answered on Jun 12, 2011 | 258 views

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