In the control panel for the US-428, the indicators are red (and/or blinking)...

In the control panel for the US-428, the indicators are red (and/or blinking). Does this indicate a problem?

These are digital input indicators. If you are not using the digital input, it is not a problem. If you are using the digital input, then a red indicator (solid or blinking) indicates an inactive or invalid digital input which is a problem.

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