Bob that's the thought process. Not good literature on everything to clean on the wittus. Tore it apart a week ago. What about a bad batch of pellets?What code?If a05 a service tech. would probably tell you to teardown and completely clean stove,check OAK (yours have a filter?),and completely clean flue.
Saw in manual pictures of all the plates you can remove(for yearly cleaning),but poor descripition,have to agree with you.
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