X10 MT12 User Manual page 12

Troubleshooting
You can't operate a module with the Mini Timer
Be sure you have power to the outlet controlling the module and the
switch on the light or appliance is on.
Check that the Unit Code and House Code on the modules are set
correctly.
Try plugging the module and the Mini Timer into the same outlet. If
the module doesn't work in any outlet, the module may be
defective.
You can't control any modules with the Mini Timer - Check to see if
a time is displayed on the Mini Timer and that you have power to
the outlet it is plugged into.
Check that the House Code for the Mini Timer is set correctly. Try
plugging the module and the Mini Timer into the same outlet. If
none of your modules work in any outlet, the Mini Timer may be
defective.
Battery backup
If you install two AA alkaline batteries in the battery compartment of
the Mini Timer, your programmed times will be protected for up to
48 hours in the event of a power outage.
Battery indicator
If the batteries are low, dead, or not installed, the low battery
indicator will appear in the display. Check the condition of your
batteries regularly and replace them at least once every 6 months.
BMB HOME 12 rev. 01-10-05