Fan Limit Control Switch Troubleshooting

All of the sudden it snaps about 20 degress very quickly below.

Fan limit control switch troubleshooting.

If your ceiling fan is brand new contact the manufacturer for a replacement fan. When the burners turn off and the exchange cools down the switch is obviously contracting but doesnt seem to rotate. 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. And the limit switch should be pulled out.

So my fan limit control switch seems to be acting up. The blower motor stops working and overheats. Call us today if you need ac service in the gresham area. High limit 200 degrees fahrenheit.

If you have an older ceiling fan the switch may be worn out. 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 exchanger is heating up the control expands and rotates appropriately. Whatever the case may be it is important to contact a trained ac company in gresham such as the clean air act inc.

The switch s sensor becomes dirty and stops working correctly. However the typical temperature settings are as follows. Problems that commonly occur with fan limit switches include. The furnace filter is clogged and raises the temperature within the plenum prematurely tripping the sensor.

Fan limit switches can be bought at an hvac supply stores or online. 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 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. 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.

When it hits the ceiling temperature i set the fan turns on. Take care not to touch wires or any switches as you could get shocked. It could be that the ac limit switch is stuck or that its wiring has short circuited. Fan control limit 90 and 130 degrees fahrenheit.

Where can you buy a fan limit switch.