Question about Intermatic Inc. ST01C Digital In-Wall Timer

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You didn't say if ST01C timer stopped working ... or if you are programming new timer and can't get it to work.

I assume you are programming new timer.
Intermatic: download EZ-instruction and full-manual so you have BIG print.

Troubleshooting in manual covers many things:
1)Press On-off button. You should hear audible click ... that tells you timer battery is good ... do the lights come on?? Load should turn on-off with manual override without programming. If load does not turn on, your wiring is wrong, a breaker is bad, a bulb is burned out, a 3-way switch on same circuit is bad.
2)Solution: review wiring diagrams > the key to wiring is black connects to Hot and blue connect to Load
Solution: If your black and blue wires are reversed, timer will not turn load on-and-off. Change them and see. Red wire is not used in 2-way switching.
3) Conflicts in programming cause timer to ignore program. For example program1 says ON at 7 and OFF at 8, but program2 says opposite.
4) Solution: make a chart of your programs
5) Solution: Reset timer and reprogram again being careful to follow instructions > instructions are tricky

Posted on Oct 05, 2010


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ST01C works on a 3-way circuit > If another switch is involved, or if switch or timer are not grounded properly, it might affect timer. Troubleshoot says disconnect red wire from 3-way circuit, and see if problem continues, and then suggests replacing timer.

Manual says if CR2 batteries are weak, then BATT shows on screen. Also says weak batteries will cause circuit not to work.
Check the CR2 batteries: Timer holds programming while you replace batteries and clean terminals.

ST01C programmable timer works on circuits up to 100 feet >> I assume because it's battery operated >> electrical interference affects the circuit because troubleshoot lists 'buried wire' as cause of failure. I guess nearby electrical devices could affect performance of timer.

Timer is rated for 15 amps which means practical maximum of 12 amps >>> so 120 volts x 12 A = 1440 watts max or 14-100 watt bulbs >> if you are running more watts, or running close to maximum, or if timer gets warm during operation, this would shorten lifespan simply by heat affecting the circuit.

Interesting that the EI600, EJ500 & ST01C battery-operated timers each has troubleshoot section in manual >>> implying these timers are problematic. ST01C has limited 1 year warranty. EI600 has limited 5 year warranty.

ST01C has 40 on-off programs per week.

If 7 on-off events per week can do the job, you can switch to the EI500 [click on EI500 to access manual]
>>> the manual shows no troubleshooting section. The EI500 requires connection to neutral or white wire, since the timer runs on electricity instead of battery

[you can use ground wire instead of neutral]

You can compare different types of programmable wall timers:

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