Jotul F500 V3 owner here. I would like to give my 5 cents of information and my experience with it.
Purchased the stove 2 years ago. This year is my second winter with the stove.
First thing I did was covered the Ash Pan holes with ceramic magnets (purchased from L or HD store). The stove has a better air control with these holes covered. My chimney is pretty tall and I have enough draft without these being open.
Last week I notice that the stove started to blow out some smoke from the side door when I would load the logs. I called one of my friends who works for the Jotul dealer. He suggested I remove the top plate and clean the combustor.
Removing the plate was a bit challenging, since one of the set screws in the back side was stuck. If this happens, remove the flue pipe and reach with a 10 mm wrench from the flue pipe opening and unbolt the bracket that the set screw taps into.
Cleaning of the combustor was easy. Friend suggested to use a garage air compressor. Do not use anything to scrape the inside. You could also tap the combustor on an even concrete surface to help remove the ash from the inside. I was told that tapping would not damage it. It worked pretty well.
Also, you can rearrange the "noodles" in the combustor to make them a bit more even looking, so nothing is sticking out.
When replacing the cover, remove the front screws with the long pins so you don't damage the element that seats under the cover. Once you have the cover aligned, you could screw the long pin by hand and use 10mm socket to finish the nuts.
I have also been told that Jotul has recently changed the combustor manufacturer and the product has been improved.
I hope this info is helpful. I love the stove for my 2500 sq home. Does absolutely great job. Dry wood is a must. Do not use paper to light the wood. Use torch. Do not stir the ashes inside vigorously, since this clogs the combustor.