Timer is not identified. You posted under Sylvania timer:
Open following link for instruction manual for re-programming timer.
http://waterheatertimer.org/Sylvania-timers-and-manuals.htmlProblem is not clear.
Do you want to permanently override timer?
Most in-wall timers have override button, but the timing programming resumes at next set point.
When you re-program timer, it lets you set on and off times, but does not let you convert the timer to an ordinary on-off switch.
There is 1 type of timer that has timing function, PLUS optional ordinary on-off capability: Intermatic KM series, Tork 701, Woods 59017, GE15070
http://waterheatertimer.org/Programmable.html#15070To replace the timer with ordinary on-off switch:
Buy on-off switch at hardware store. Switch will have 2 brass-colored screws and 1 green-colored screw.
Turn off power.
Remove timer wires, but note 1) which wire connected to timer red-or-blue wire and 2) which wire connected to timer black wire.
These two wires will connect to different brass colored screw on new switch.
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