The pin code on this device can be changed by following a few simple instructions.
Marantec garage door keypad programming.
Marantec m3 631 keyless entry programming instructions.
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Step 1 slide the protective cover of the marantec wireless keypad up to access the number pad.
The remote needs a strong signal to program the 4 digit pin code into the keyless.
Instructions also show how to change the batteries mount the keypad change the existing pin number and clear the keyless entry memory.
In this video precision garage door of columbus ohio provides instructions for programming your garage door opener and keypad for marantec and precision models.