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If an incorrect code is entered, the unit does not enter configuration mode and the gas-monitoring screen is activated.
If the security code is unknown, configuration mode can be accessed as follows: enter 412, then press both buttons simultaneously and hold briefly. This activates the next configuration mode screen. This also resets the
security code to 000, leaving configuration mode unprotected. The security code can be reset in configuration mode at the security-code-setting screen.
