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Spill switch tripping is a flue inducer necessary here?
My collector hood spill switch keeps tripping, on new W-M EG 55. I installed a cap on the chimney after the first incident a week ago and system worked fine for the next week even through the 0 degree temps and high winds. Then this morning it tripped again. I feel cold air coming out of the vent when the damper is open. There are no fans or other negative pressure items running. Chimney, clay lined, is not obstructed and I never had this problem with the old system. Is a flue inducer called for?