Normally your catalytic combustor requires little or no maintenance. Because it generates such high temperatures it is basically self-cleaning.
After the first burning the combustor should have a light gray powdery appearance. Should the combustor’s cells become masked with fly-ash, use a paintbrush or soft-bristled brush and dust the combustor gently.
(See my next posting with complete details on cleaning the combustor.)
However, it might be wise to check and clean the combustor, if necessary, before each burning season and inspect all flues for creosote build up.
Cleaning the flue before each burning season helps prevent chimney flue fires.