White Rodgers SuperStat Pro Programmable Thermostat - Manual (Page 45)

Troubleshooting Assistance Guide
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Equipment
Fan will not turn Off.
• The thermostat fan setting may be in the On position. In this position, the fan will
continuously run. Change it to the Auto position.
• Thermostat may be currently calling for heat or cool. This is normal operation. Fan
will turn off automatically once the heating/cooling is satisfied if fan is in Auto mode.
• With fan in Auto mode and heating and cooling system is not operating, the fan will
not shut off. The air handler fan relay switch is likely bad. Call your heating and
cooling contractor.
• Heating/Cooling equipment has an internal fan overrun where the fan continues to run
after the heating or cooling unit turns off. Typical fan overrun times are 1-2 minutes
following the heat or cool system shut down.
Fan will not turn On.
Some heating and cooling equipment, especially gas furnaces, have a built-in time delay
before the fan is activated (plenum switch or fan timer). It may take up to 90 seconds. A
temperature sensor in the top of the air handler activates the fan on a gas furnace.
Set the heating setpoint 5 degrees above the room temperature. Wait 5 minutes for the fan
to be activated. If the fan does not activate, call your heating and cooling contractor.