Now that spring is coming slowly to Northern Maine, I do not need the boiler to run almost continuously. Currently, I've been making a small fire in the morning and one in the evening. The fire burns quickly to bring the water temp maintains an operating temperature of 180 for a couple of hours and then slowly loses temp. During this time, the fan continues to run until way below 140. Whithin the controller settings, is there a setting I can program to have the fan shutdown so that the fan is not operating for such a long period of time without any apparent benefit?