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Jul 11, 2017 · One noise sometimes described as a grinding noise that doesn’t have anything to do with a moving part is the sound a reversing valve makes when shifting from heating to cooling. Technically a moving part is involved but it happens only one time for a brief moment and then stops moving. A modulating furnace will heat on a low capacity until a call for high heat is sent to the furnace. Once a high heat call is initiated the furnace will slowly increase the burner level and blower speed over time, until reaching full capacity. The advantages are potentially reduced noise and better efficiency in some models. Delayed ignition is when that gas isn’t ignited immediately, allowing the gas to build up in the furnace. The gas keeps building until—BOOM—it reaches a flame and finally ignites, causing a small explosion in your furnace.