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Observe polarity. 2) Press and hold the B & K and MUTE buttons simultaneously for two seconds. The LED will light up solid red and stay illuminated. 3) Firmly press the desired B & K three digit code set. Always use three digits (i.e. 0-1-1 default for Zone A) 4) Press the B & K button again to confirm setup. The red LED will blink three times when the IR MZ-128 Default Factory Code-Set is: 0-0-0 Whole House Control CODE SET 000-128 MZ-128 BUTTON B & K IR FUNCTION MZ-128 BUTTON B & K IR