In a gas furnace, the blower will continue to run if the fan switch on the thermostat is set to any setting other than auto. The blower on a furnace will also continue to run if its filter is extremely clogged.Know More
When the furnace's thermostat is set to auto, the fan will only run until the space that is being heated or cooled reaches the preset temperature. Settings such as low, medium or high cause the fan to run continuously regardless of the temperature that is reached in the space.
A clogged filter may cause the furnace's blower to run continuously because it can damage the furnace's limit switch. The limit switch is designed to detect the temperature inside of the furnace. It automatically shuts off the fire in the furnace if the temperature becomes too high until the furnace has the chance to reach a safe temperature.
A clogged filter also restricts the air flow inside the furnace. This causes the safety switch to remain open, causing the fan to run continuously. The fan will not stop until the safety switch closes. In this case, a fan that continues to run is a sign that the furnace has overheated.Learn more about Heating & Cooling
Set the thermostat to "Cool" and then check to ensure that the blower motor in the furnace is working. The blower motor should ideally be running. If the motor is not running, check the On/Off switch to ensure that it is in the "On" position.Full Answer >
There are several reason why a central heater might blow cold instead of warm air and these include a blown out pilot light, an overheated furnace or its thermostat is set to "On." These three issues are the most common causes of why a central heater will blow cold air and the ways to fix these issues are relatively simple.Full Answer >
To turn the fan of a Lennox air conditioner on high, locate the thermostat, find the fan setting on the thermostat screen and change the setting. This process takes approximately 3 minutes and requires access to the thermostat.Full Answer >
It is considered OK to continuously run a furnace fan. Homeowners should experiment to see if it works best for their home to have the furnace fan running continuously or not. If homeowners find this is beneficial, it is generally suggested to only run the furnace fan constantly during the cold heating season. There are several benefits and some drawbacks to running a furnace fan constantly.Full Answer >