Question about Intermatic Inc. ST01C Digital In-Wall Timer

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Suddenly the timer is not turning on the lights. The screen on the timer says "SOU". ????

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Here is link to product manual at Intermatic. Manual shows troubleshooting, but doesn't show "SOU"
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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:

Posted on Sep 13, 2010


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