Hvac Fan Limit Switch Location

Most types of residential furnaces feature an internal component known as a blower switch that is used to shut down the fan motor in the event that the appliance overheats the motor malfunctions or the furnace filter becomes clogged.

Hvac fan limit switch location.

Honeywell furnace temperature fan limit switch control the fan limit control turns the fan on and off in furnace applications. It reads the temperature of the plenum and waits until it gets appropriately warm. It s possible to reset the switch at home when necessary by following a few simple steps. Test and replace the fan limit switch on a furnace hvac how to.

However for your own safety don t attempt to reset the switch without first consulting your furnace s instruction manual. Just as it determines when the blower assembly should turn on it will also determine when it should turn off. The oil fired furnace fan limit switch shown in our photo below is in use on an oil fired warm air furnace where we can see about 3 4 of the silver colored dial where the fan limit switch settings are made red arrow. Fan control limit switch the fan switch reads the temperature inside a furnace and once the temperature becomes warm enough turns the blower motor on sending warm air into a home.

It works off of temperature and also provides a high temperature safety limit this is a switch actually two switches which turns the furnace blower on and off based on the temperature of the heat exchanger. It also determines if the furnace should be shut down in the case of overheating. A helical bi metal probe extends from the back of the. To restore the furnace to normal operation you must reset the switch on the blower motor.

The function of your furnace limit switch is to tell the fan when to turn off and on depending on the temperature in the home. Goodman gmt115 5 fan randomly turns on doityourself. Goodman gms81005cn 100 000 btu furnace 80 efficiency single. Once the plenum reaches a specific temperature the limit switch sends a signal to the air handler to begin running and delivering warm air to your home.

Goodman fan limit switch location. This is used so that cold air is not blown into a house waiting for the gas flames to heat up enough before the blower turns on. The fan limit switch also has two other functions. A limit switch also acts as.

Fan and limit control 8 limit control 14 multiple appliance interlock control 2 plenum thermostat 10 snap disc control 51 temperature transducer 3 thermostat 2 universal interlock control 1 warm air limit control 1 view all. The gas fired forced air furnace fan limit switch in the photo below is pointed to by the red arrow. How a fan limit switch works.