Vermont Castings Defiant 1975-CAT-C Installation & Operating Manual page 36

Operate the stove in your usual manner for two weeks,
inspecting the chimney and the chimney connector frequently
during this period.
If creosote does not build up as fast, it is likely that the
performance change was caused by fly ash deposits on
the catalytic element. However, continue the inspections of
the chimney system for a few weeks to ensure that proper
performance continues.
If you continue to find a significant creosote buildup or if
you continue to see excessive smoke from the chimney,
the catalytic element will need to be replaced. Contact your
nearest Vermont Castings' Authorized Dealer for information
about a replacement element.
NOTE: Use only the replacement catalyst supplied by a
Vermont Castings dealer.
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Vermont Castings • Defiant® Model 1975-CAT-C Installation Manual_R12 • 11/21 8390-975