What about the circulating fan and cover? Are they spotlessly clean? Then I would look at the louvers to make sure they are fully open. If you use the Economy Plus feature the stove will step down to Low and run until the temp is 12 degrees over the set temp. If set too high the unit will never get to the set temp if it is cold outside.
If the heater is running at all it is getting the right amount of fuel. Your problem is something other than fuel flow, cold house, thermistor set a too low a height, dirty fan and cover. I wish you a Happy New Years eve. Tom
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