Both my husband and I had to work very hard for the cartridge to communicate with the printer so I did not get a red error light. After much effort, we got it to work. However, for several days thereafter the red light would go on again for no apparent reason. Also the cartridge prints lighter than any I have had making it somewhat harder to read. Being priced at about 50% of the retail cost of the real Samsung cartridge makes this worthwhile trying at least once more.