Written by
Marcus Hale Appliance Repair Content SpecialistPublished September 11, 2026Updated October 20, 2026
Error codeCode 4
ApplianceRefrigerator
Quick answer
Code 4 on DCS ActiveSmart RS/RF refrigerators is a temperature sensor issue, signalled by alarm beeps or flashing LEDs.
Model compatibility: DCS reuses codes across series and model years, so Code 4 may mean something different on another appliance or generation. Confirm this against your model’s documentation and record your full model number before acting.
Plain language
What this code means
Temperature sensor issue, shown as a count of alarm beeps or a binary pattern of flashing LEDs.
Error code 4 on your DCS refrigerator is read as a temperature sensor issue. It applies to DCS ActiveSmart indoor integrated refrigerators in the RS/RF series.
Meaning of code 4
Instead of text, the unit signals with alarm beeps you can count or a binary pattern of LED flashes.
Owner steps
The alarm mute button is the owner step here, and it applies to ActiveSmart units. After that, a service technician is needed.
DCS refrigerator service in Los Angeles is available at (310) 616-5236. Have the code, the model number and anything you already tried ready, and see our refrigerator repair page.
Important safety warning. Do not attempt repairs involving electrical components, gas, water lines, refrigerant or sealed systems. Unplug the appliance if it is safe to reach the outlet, and leave internal diagnostics to a qualified technician.
Seeing this code on your DCS appliance?
Book a specialist visit for a clear estimate and approval before any repair.
