Things You'll Need

Instructions

1

Turn off electrical power to the furnace.
2

Remove the two screws securing the cover to the fan limit switch and remove the cover.
3

Locate the Fan Off adjustment tab. It's the furthest tab to the left on the round silver adjustment dial of the fan limit switch.
4

Hold the silver adjustment dial in place while sliding the Fan Off adjustment tab to the proper temperature setting inscribed on the dial. The Honeywell factory temperature setting for the Fan Off limit is approximately 95 degrees Fahrenheit.
5

Locate the Fan On adjustment tab. It's the second tab from the left on the round silver adjustment dial of the fan limit switch.
6

Hold the silver adjustment dial in place while sliding the Fan On adjustment tab to the proper temperature setting inscribed on the dial. Depending upon furnace manufacturer's specifications, Fan On settings cover a range from 20 degrees Fahrenheit above the Fan Off setting to a maximum of 30 degrees Fahrenheit below the Limit Off setting. The Honeywell factory temperature setting for the Fan On tab is approximately 130 degrees Fahrenheit.
7

Replace the fan limit switch cover and secure with two screws.
8

Restore electrical power to the furnace.