After the GXV3140 is installed; you should do a diagnostic to make sure that the keys are functional. Select [MENU]→[Settings]→[Maintenance] →[Factory Functions] →[Keypad/LED Diagnostics] and press Start to start the diagnostic process (see figure below).
In the diagnostic mode, the name / function of every key you press (except F4 / Exit) will be displayed on the LCD. This ensures that the keys are working properly. If the displayed name does not match the key you press, it means there is a problem with that key. Press F4 to exit the keypad diagnostic mode.
Note: The [MENU] key is also mapped to the round OK button on the GXV3140 keypad.
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