Clothes dryer with its vent duct in a small laundry closet

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LG appliances: Smart Diagnosis (audible and Wi-Fi), display/demo mode and test-mode concepts

LG's Smart Diagnosis sends the appliance's status to the ThinQ app over Wi-Fi or, on older models, as an audible tone the phone picks up near the appliance speaker; the app then shows the result. A fridge that looks normal but does not cool may simply be in display (demo) mode. LG also has service test modes that run fans, compressor and defrost on command; entry varies by model and should come from the service sheet.

Single source ~20 min easyBrands: LG, Signature Kitchen Suite

Before you start

Test modes are control functions only; sealed-system work is blocked and goes to an EPA 608-certified technician
Unplug before removing covers

Diagnostic steps

Unlock all 6 steps with expected values

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OnCall Tech is a reference tool for trained technicians and can make mistakes. Always disconnect power and confirm with the manufacturer's documentation before you work.

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