Blaze King 40 catalyst issues

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The cat gauge did not go up after lowering the thermostat halfway and turning flames into flickers
That is to be expected. After all, the "food" for the cat is carbon monoxide. Only then it can combust that with residual oxygen to carbon dioxide.
When you run the thermostat wide open, an excess of air is introduced into the firebox, which causes most of the CO to be combusted before it can reach the cat. And cat temperature is a function of CO-to-CO2-conversion in the cat, as that reaction is exotherm.
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