On Interphone Code 26, what does a steady orange call light indicator with three low chimes indicate?

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Interphone codes use lights and tones to convey status of onboard systems. A steady orange call light with three low chimes specifically signals a fault in the smoke detector circuit, meaning the smoke detection system is not functioning properly and may require maintenance. It’s not indicating actual smoke or a fire emergency, which would produce a different alarm pattern; nor does it indicate a lavatory request or a flight deck emergency, which have distinct lights and tones. In this situation, crew should follow procedures to verify there’s no actual smoke and arrange for inspection or maintenance of the smoke detector system.