Why Doesn't ALL LIGHTS ON Doesn't Work on my Mini Timer?

[ch4man]

My mini timer will not turn lights on when I punch the "All lights on" button. The individual buttons work and the "all lights off" button seems to work fine. Any hints?

[JeffVolp]

Do you perhaps use appliance modules for your lights?  Appliance modules respond to "Units"  The mini-timer sends "All Lights ON" and "All Units OFF".  Appliance module will not respond the the "All Lights ON" command.

Jeff