Samsung
Air conditioner

Select the code shown on your appliance to review its meaning and possible cause.

E121
Room temperature sensor issue

This code is associated with an open or short circuit in the room-temperature sensor.

C121
C154
Indoor fan motor protection

The indoor fan motor may have entered protection mode because of abnormal voltage or an internal component issue.

We currently provide a verified sample and will add more codes after checking official sources.

LG Air conditioner