I have a Intermatic T104 that at times the timing motor runs backwards when a power loss is encountered and the power comes back on at times the motor runs backwards. the only way to make it return to the right direction is to take the power away and reenergize the circuit. It does not happen all the time. Is there a diode that can resolve this problem?

Craig Butler

• 1730 Answers
• Posted on Jun 30, 2009

SOURCE: Intermatic pool pump timer, time clock won't turn

Check your wiring, it sounds like it's not right. The clock needs 120 volts to run.

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SOURCE: Turned off main circuit breaker for maintenance

OK .. first check the breaker in the main electrical panel, make certain that it is retset, then the breakers in the pool disconnect, making sure they are reset and feeding power to the pump. Oh just so there is no confusion. when resetting a breaker, press firmly to off , then back to on .. if the timer will opperate the clock dial , then it should be good with turning on the pump.

SOURCE: have intermatic t103 time switch, 240 v supply,

Maybe-bad news.
The link below shows wiring for the T-104, T-103 and T-101
http://waterheatertimer.org/How-to-wire-T104-Intermatic-timer.html#T103

For a 240V installation, the correct timer is the T-104, not the T-103
This is because the T-103 clock motor is 120V, and requires additional neutral wire on terminal A
The T-104 clock motor is 240V, and requires only the two hot wires and does not require a neutral.

I suggest you exchange timers and get the T-104
Or run another wire to nearby 120V receptacle and connect Terminal A to the white wires in nearby receptacles. This will give you the neutral that is needed for the clock.
In the absence of a Neutral wire, you can work-around by connecting ground wire to Terminal A >>> but this is NOT Code. You might use the ground wire as a temporary work-around until running additional neutral wire.

SOURCE: The dial on the intermatic water heater timer is

You can replace clock motor on many Intermatic timers:
Snap mechanism loose using metal spring top inside box.
Tip mechanism out and get clock motor number off motor.
Google search specific clock motor number.

Aplus sells many clock motor:
http://www.aplussupply.com/intermatic/timermotors.htm
Electric supply online sells clock motors
http://www.electricsupplyonline.com/prod/intermatic-motors.php

Grainger carries inexpensive clock motors for T101, T103, T104 timers.
http://www.grainger.com/Grainger/timer-accessories/timers/electrical/ecatalog/N-8hi
T101 and T103 use 125v motor
http://www.grainger.com/Grainger/INTERMATIC-Time-Clock-Motor-1PNK1?Pid=search
T104 uses 240v motor
http://www.grainger.com/Grainger/INTERMATIC-Time-Clock-Motor-1PNK2?Pid=search

SOURCE: I bought a house that had an intermatic t104

If you only have a Black wire, White wire and a ground wire, you are only wired for 120 volts. For 240 volts you have to have two Black wires or a Black and a Red as well as a White (neutral) and a ground.