Fan Runs Continuous

Fan Runs Continuous

FAN RUNS CONTINUOUS – The thermostat maintains the correct temperature, but the indoor fan never quits blowing.

POSSIBLE PROBLEM & DESCRIPTION

Thermostat "Fan" Switch

  • The most common cause of this problem is the “Fan” switch on the thermostat.  It normally has two options – “Auto” and “On”.  In the “Auto” position, the fan should cycle on only when there is a call for heating or cooling.  In the “On” position, the fan will run continuously. Watch Video.
  • Some new thermostats have an additional fan setting of “Circ”, which is short for “Circulate”.  In this mode the fan will cycle on and off with heating & cooling, but it will also kick-on automatically if there is an extended period without a demand for fan – to provide additional air circulation.

Humdification

  • If your system has an added humidifier, this could cause the system to run more than normal.
  • Some humidification system energize the blower to operate even when the heating system is not running to maintain the humidity setpoint in the space.

Stuck Blower Relay - Qualified Technician Recommended

  • Many gas furnaces have either a fan relay or a control board to cycle the fan on and off as needed.  Sometimes the relay or control can stick which will cause the fan to run continuous.

Stuck Fan Switch  - Qualified Technician Recommended

  • Some older gas furnaces use a heat-activated fan switch to start the blower after the burners have fired and the heat chamber has warmed-up.
  • The fan should stop once the burners go off and the heat chamber cools.
  • A stuck fan switch can cause the fan to run continuous.
  • Some "Fan&Limit" switches have a push-button, manual-override that, when depressed, causes the fan to run continuous.

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