Furnace Fan On Off Switch

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Furnace fan on off switch.

Limit switch issue furnace blower fan wont turn off if the furnace overheats then a limit switch will open. 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. 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. Your furnace fan limit switch is basically a control system that determines when the furnace blower assembly should turn on and off.

Throw the switch to on if the fan comes on then you. It s usually mounted on the side of the furnace or a wall nearby. Fan limit switches are used on all types of building heating furnaces. 4 5 out of 5 stars 162.

More buying choices 88 00 18 new offers. Essentially this means that it determines when the hot air should be blown through your ventilation system. If you have your thermostat s furnace or air conditioning for that matter fan set to on the fan will continually run regardless if your furnace is running through a heating cycle i e whenever your furnace is actually producing heat. This control also provides a safety limit that turns off the burner or furnace if temperatures at the furnace are too high.

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. 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. That will cause the burners or heat source to shut off and the fan to run until the limit switch closes again. 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.

In some cases the limit switch will stick open and this will cause the fan to run continuously. 1 16 of over 1 000 results for furnace fan switch honeywell l4064b2236 combination fan and limit furnace control. The fan limit switch also has two other functions.