20 MM371W / MM372W Installation InstructionsS2S4S3LED1LED2LED3TRANSMITTER PROGRAMMINGWARNING: Changes, modifications or adjustments not expressly approved by Nortek Security and Control, LLC could void the user’sauthority to operate this equipment. There Are No User Serviceable Parts.S2S4S3LED1LED2LED3How to Learn a Transmitter:1. On the control board, press and hold the (return/enter) button until LED2 beside the (return/enter) button turns on and thebuzzer sounds. Release the (return/enter) button.2. Press and hold the desired transmitter button. Once learned, LED2 will flash and the buzzer will sound indicating that thetransmitter has been learned.How to Erase a Transmitter or Keypad (MMK200) code:Repeat steps 1-2 above to erase the learned transmitter or keypad code.How to Erase ALL Learned Transmitters or Keypad codes:1. Enter the 'Learn Transmitter' mode following step 1 above.2. Press and hold the (down arrow) button until LED1, 2 & 3 flash and the buzzer sounds. (Approximately 10 seconds.)Note: The control board can store a total of 50 transmitter and/or keypad codes. The system is compatible with Mighty Mule DIPswitch transmitters and keypads.