Question: what is the difference between rpwf and rpwfe filters?
Answer: The only difference between the RPWF and the RPWFE is a chip on the back of the E which tells when to change the filter and supposedly detect leaks. ... There is a RFID chip on the back of the filter that communicates with the Refrigerator. That is why the filter will not work in newer refrigerators like the GE Profile.