Question posted under Tork SS720 timer.
I don't have repair for defective timer that worked before and stopped working.
If this is new timer, then add a comment and explain wiring in exact detail, and include what you mean by 'dimmed' mode.
Timers have 1 year limited warranty.
Timers are affected by line noise, and generally cannot be connected to a dimmer.
SS720A timer is robust 120Volt single-pole 7-day programmable timer, rated for 15Amp up to 1 HP.
The larger the amp load, the shorter the lifespan for electrical devices.
Last step troubleshoot for programmable timer is to reset timer and reprogram.
Reset timer by pushing in reset button for several seconds.
If functionality is not restored, then timer has gone bad.
Tork SS720 is identical to GE15071 timer sold at Home Depot.
Buy another timer, and return defect in new package.
http://waterheatertimer.org/Tork-consumer-timers-and-manuals.html
http://waterheatertimer.org/pdf/SS720A-Tork-In-wall-manual.pdfhttp://waterheatertimer.org/GE-timers-and-manuals.html#15071
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