Furnace Fan On Off Switch

The fan limit switch on a heating furnace controls when the furnace blower fan turns on and off.

Furnace fan on off switch.

That will cause the burners or heat source to shut off and the fan to run until the limit switch closes again. 4 5 out of 5 stars 162. Get it as soon as fri sep 18. 1 16 of over 1 000 results for furnace fan switch honeywell l4064b2236 combination fan and limit furnace control.

The system uses a temperature probe to detect temperature changes inside the heat exchanger see image below and turns your blower on and off in response. Throw the switch to on if the fan comes on then you. Among other benefits this switch allows you or your plumber or repair technician to shut off the electricity to the furnace without having to go to the main service panel to switch off the circuit breaker. Essentially this means that it determines when the hot air should be blown through your ventilation system.

Your furnace fan limit switch is basically a control system that determines when the furnace blower assembly should turn on and off. The fan limit switch also has two other functions. More buying choices 88 00 18 new offers. Limit switch issue furnace blower fan wont turn off if the furnace overheats then a limit switch will open.

Most thermostats have a switch for the fan that says either on or auto which means that the fan turns on when the equipment comes on. It s usually mounted on the side of the furnace or a wall nearby. Details of checking the thermostat s fan auto off or fan on switch position when the furnace or air conditioning fan won t stop running are at fan wont stop thermostat switch other snafus such as a shorted thermostat wire can also cause the a c or warm air furnace fan to run continuously. A fan limit switch is a component of a furnace system that determines when the furnace blower assembly for hot air turns on and off.

If you have your furnace again or air conditioning fan set to auto your system s fan will run during the furnace s heating cycle only. Free shipping by amazon. Fan limit switches are used on all types of building heating furnaces.