I am new here and have searched many of the topics, but can't find anything similar to what I am going through. I went to fire up the stove this year (Harmon Accentra - Freestanding) and it fed pellets in test mode and then started up just fine (using the auto-ignitor). Once the fire got going, however, it would not feed pellets (even though the Feed light was on). The fire burned out, once the stove was cool, I unplugged, re-plugged and got a 3-blink error (ESP probe). I did this several times and kept getting the error. Service tech came out and said that my stove is too old (not sure which year as it was in the house when I bought it 2003-2005?) for him to use the diagnostic tool. He tried replacing the ESP probe but he kept getting the error. He then installed a new pressure switch. The stove started up and fed pellets, but it seemed to feed and then it would let the fire die back and then feed again. In the past my fire usually stays the same size. It was like it wouldn't let the fire get too big. I recently swept the vent and he even commented that he saw no blockage in the exhaust port where the ESP probe is located. He told me to sweep the vent again and make sure there are no blockages and to call if the issue persists. Has anyone had similar issues?