Fan Limit Control Switch Troubleshooting

So my fan limit control switch seems to be acting up.

Fan limit control switch troubleshooting.

Where can you buy a fan limit switch. Turn off electrical power to the heating system reconnect the fan motor where you previously disconnected it turn on electrical power to the heating system call for heat. Fan limit switches can be bought at an hvac supply stores or online. All of the sudden it snaps about 20 degress very quickly below.

If your ceiling fan is brand new contact the manufacturer for a replacement fan. If the fan limit switch worked normally continue as follows. If you have an older ceiling fan the switch may be worn out. Fan control limit 90 and 130 degrees fahrenheit.

Call us today if you need ac service in the gresham area. In this case replace the reverse switch. The blower motor stops working and overheats. And the limit switch should be pulled out.

The switch s sensor becomes dirty and stops working correctly. Find the fan limit switch see that article and return to this page if you don t know what the fan limit control switch looks like and if your control sports a metal cover remove that too. Take care not to touch wires or any switches as you could get shocked. When the exchanger is heating up the control expands and rotates appropriately.

If both the blower motor and limit switch test good than other possible problems may be the contactors circuit board or gas valve and possibly the thermostat. Whatever the case may be it is important to contact a trained ac company in gresham such as the clean air act inc. When it hits the ceiling temperature i set the fan turns on. The instructions differ depending on whether you have a combination switch or separate high and fan control limit switches as well as on the specific model you have.

The furnace filter is clogged and raises the temperature within the plenum prematurely tripping the sensor. When the burners turn off and the exchange cools down the switch is obviously contracting but doesnt seem to rotate. It could be that the ac limit switch is stuck or that its wiring has short circuited. Set the building thermostat to call for heat.

High limit 200 degrees fahrenheit.