Model 4821/4820 Control/Communicator Installation Manual
5-20 150965
Trouble Two short, low-pitch beeps. Not applicable.
Press [Code].
Doorbell 1 Slow two-tone (“ding-
dong”) bell sound.
Not applicable. Not applicable.
Doorbell 2 Slow bell (“ding”) sound. Not applicable. Not applicable.
Ready and Not
Ready Chimes
Two quarter-second chime
tones.
Not applicable. Not applicable.
Audio Test Loud whoop sound for two
seconds on internal and
external speakers.
Steady. Not applicable.
Condition Speaker Sound Bell Sound How to Silence/Reset
MUTE
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