For the installer to change the Master Code:
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Enter programmers mode by entering installers code (default 98765) # 0.
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Enter address 84 then press 01+1+new passcode (1 to 5 digits) followed by the # key.
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Press and hold star key to exit programming.
For the User of the system to change the Master Code:
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Enter user code programming mode by entering the master code (default 1234) # 0.
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Enter 01+1+new passcode (1 to 5 digits) followed by the # key.
If entered correctly, a long beep will sound at the end of the commpleted sequence.