I do not have that stove, and I'm not familiar with it, but I do have a catalytic stove. The only form of heat I have had for nearly a decade. (Well, I have several stoves running the house) so there are several issues that have caused me performance: yes catalyst go, I have burned them up from running them too hot, hitting it, and coating it with ash. The other issue I have had has been a build up of ash above the cat. Either way, you should pull it, rinse it off, check above it. They are available relatively cheaply now if you are not too broke.
I had that same stove and I was never happy with it as far as heat output is concerned from new.Eventually got rid of it after 12 years of use.Cat was in bad shape and I found a crack in the fire back.
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