Hvac Fan Limit Switch Location

The gas fired forced air furnace fan limit switch in the photo below is pointed to by the red arrow.

Hvac fan limit switch location.

It s possible to reset the switch at home when necessary by following a few simple steps. 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. Honeywell furnace temperature fan limit switch control the fan limit control turns the fan on and off in furnace applications. A fan limit switch consists of the following components.

A limit switch also acts as. Goodman fan limit switch location. 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. 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.

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. A helical bi metal probe extends from the back of the. How a fan limit switch works. It reads the temperature of the plenum and waits until it gets appropriately warm.

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. To restore the furnace to normal operation you must reset the switch on the blower motor. Goodman gms81005cn 100 000 btu furnace 80 efficiency single.

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. Just as it determines when the blower assembly should turn on it will also determine when it should turn off. By saum hadi posted on august 31 2018. The fan limit switch also has two other functions.

Goodman gmt115 5 fan randomly turns on doityourself. It also determines if the furnace should be shut down in the case of overheating. 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.