What do the diagnostic error codes PF, FF, dE, and CI mean on my refrigerator?

PF means power to the refrigerator has been interrupted for more than two seconds — check food condition and press SYSTEM CHECK-RESET to erase. FF means freezer temperature has risen above normal — check frozen food and press SYSTEM CHECK-RESET after temperature returns to normal. dE means something is wrong with the defrost system — keep doors closed and call for service. CI indicates an icemaker problem, such as ice clumps stalling the icemaker. (Page 8)