The D4112 uses the D420A, D620 or D636A Command Center. The A, B or C keys are disabled by disabling the function related to the key, however this will completely disable the function as well.
It is necessary to determine if it is acceptable or not to disable the related Command function.
The D420A has an A and B key, the A key is programmed to perform Command 44 (Local System Test) and the B key is programmed to perform Command 47 (Reset Sensors). The D620 and D636A also have a C key which is programmed to perform Command 5. Command 44 and 47 are enabled by default and can be disabled in the System Test/Reset module by selecting No in the related parameter. Command 5 is disabled by default but can be enabled by selecting Yes in the Cmd5 PassChg parameter in the Command Options Module in programming.