Good morning,
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I couldn’t find a Carter Hoffmann W323s manual, but they do have a lot of modular warming cabinets for a variety of uses. That said, the low temperature alarm means something is faulty and will need replacing.
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It’s either the heating element, a relay, an air probe, or a controller on your unit. My guess without seeing the unit would be it’s not the heating element, since you said the top is still keeping temperature.
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Perhaps another user has more insight. I hope this helps a bit!
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John