On the TC10, what does it mean if AL and 1 are lit?

AL on the front of the TC10 is the alarm lamp. 1 to 4 indicate the status of outputs 1 to 4.

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    The TC10 is a compact single loop temperature controller with an easy-to-read 3-color LED display. The shallow depth of the controller helps save to space. The TC10 supports easy configuration with codes for quick start-up.

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