DIAGNOSIS The most common cause is an incorrect Wi-Fi setup sequence or a 5GHz network incompatibility. The LMC0975ST only connects to 2.4GHz Wi-Fi networks.
FIX Checklist: 1. On the microwave, press and hold the 'Smart Diagnosis' button for 3+ seconds until the Wi-Fi icon blinks. 2. Ensure your phone is on the 2.4GHz band of your router (temporarily disable 5GHz if possible). 3. In the SmartThings app, add device, select 'Microwave', then follow the audio pairing steps precisely. The microwave will emit a series of tones for the app to analyze.
IF THAT DIDN'T WORK Perform a network reset on the microwave. Hold 'Off/Clear' and 'Sound' buttons simultaneously for 5 seconds. Repeat the setup. If it fails, the unit's Wi-Fi module may be faulty.
HEADS UP The microwave must be within strong range of your router during setup. Thick kitchen appliances can block signal. The connection is for control and diagnostics only, not for streaming.