Jotul 3 TDIC crust below catalyst?

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CraigP076

New Member
Nov 15, 2025
1
Maine, USA
I moved into a house with a 30+ year old Jotul 3 TDIC. When I opened the back, the catalyst had a thick layer of ash covering it, but after vacuuming looks in good shape.

But below the where the catalyst sits seemed dirty. When I tried to clean it, a piece came out of what looks like a crust layer and I can see through to the fire box below (see pictures).

My question is- should I clean out all this crust layer, or is this something that was supposed to be there separating the catalyst and has been degraded?

I'm new to wood stoves so any guidance is much appreciated.
 

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I'm not familar with the cat version but it looks like the middle section has burned out. What I am not sure is if this is part of the inner back plate or the actual back panel. D. Hermit has more experience with these stoves. I think DAKSY did one about 6 yrs ago.