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The feeder shouldn't have any impact on when the boiler cycles on temp. There are 2 things that control burner firing, the thermostat (burner shuts down when thermostat is satisfied) and the pressuretrol (burner shuts down when limit pressure is reached). The feeder is controlled by the low water cut off (LWCO). The LWCO can shut the burner down if the water level in the boiler gets too low at which point the feeder should kick in and add water. I assume the LWCO is the factory installed and wired model. Can you provide the brand and model of the feeder. Is this a new boiler?