How is a malfunction indicated by the CSE 102 detector?

The answer is indicated by a yellow light signaling a malfunction when the battery test is performed. This specific indicator is vital for understanding the operational status of the CSE 102 detector. A yellow light suggests that the device is experiencing issues that need to be addressed, particularly related to the functionality of its power source. It is important for users to recognize this warning to ensure the device is operational and reliable.

In contrast, a red light typically indicates that the detector is powered on but does not specifically denote a malfunction; it's merely showing that the device is active. The continuous audio alarm serves as a warning of immediate danger rather than a malfunction of the device. Finally, the presence of an error code on the screen suggests a more advanced level of malfunction indication but is not described as the primary indicator for a battery test issue, which specifically relates to the yellow light. This understanding helps prioritize device maintenance and readiness during operations.