Was having trouble with pellets overfeeding in my Harmon Invincible RS, and contacted several places to get assistance. Mace was the only that I could that I contacted that was able to help. I spoke with Carol and she was able to locate the manual for my pellet stove even though it is well over 20+ years old.
Over the phone she gave me some troubleshooting tips and ways to make sure I was properly cleaning the stove. I needed to get a cleaning brush that I didn't have, but she had one at her store, so I went over to pick it up.
In the 20ish minutes I spent at the store, I received an incredible education on not only my pellet stove, but also how pellet stoves work in general. Everything from how to select the right pellets, and how to setup up my specific pellet stove for better operation.
Turns out my issue with the overfeeding pellets, was operator error on my part, as I did not understand how to properly adjust the feed rate. I have yet to try the recommendations, as I need to finish cleaning my stove. However, I wanted to take the time to give Mace a review, and would highly recommend you reach out to them for help with any of your pellet stove needs, especially Harmon Pellet stoves.
Just call and ask for Carol, she'll be happy to help you!