Fan Limit Control Switch Troubleshooting

The furnace filter is clogged and raises the temperature within the plenum prematurely tripping the sensor.

Fan limit control switch troubleshooting.

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. All of the sudden it snaps about 20 degress very quickly below. Whatever the case may be it is important to contact a trained ac company in gresham such as the clean air act inc. So my fan limit control switch seems to be acting up.

It could be that the ac limit switch is stuck or that its wiring has short circuited. Where can you buy a fan limit switch. Call us today if you need ac service in the gresham area. The switch s sensor becomes dirty and stops working correctly.

When it hits the ceiling temperature i set the fan turns on. In this case replace the reverse switch. And the limit switch should be pulled out. When the exchanger is heating up the control expands and rotates appropriately.

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. If your ceiling fan is brand new contact the manufacturer for a replacement fan. The blower motor stops working and overheats. 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.

When the burners turn off and the exchange cools down the switch is obviously contracting but doesnt seem to rotate. High limit 200 degrees fahrenheit. If you are using a remote or wall control to reverse the ceiling fan confirm the dip switches on the control and receiver are set to the same frequency. Fan control limit 90 and 130 degrees fahrenheit.

If you have an older ceiling fan the switch may be worn out. Fan limit switches can be bought at an hvac supply stores or online. Problems that commonly occur with fan limit switches include. Take care not to touch wires or any switches as you could get shocked.

If the fan limit switch worked normally continue as follows.