Trane Fan Limit Switch

Fan control limit switch the fan switch reads the temperature inside a furnace and once the temperature becomes warm enough turns the blower motor on sending warm air into a home. So my furnace suddenly stopped working. Thought that was the fix but the burners went out and the same code again.

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The swt01259 limit switch is used on many trane and american standard furnaces.

Trane fan limit switch.

The high temp limit switches usually have a manual reset button that needs to be pressed to reset. I have a trane xe 80 and my high temp limit switch open led flashing light code appeared. This is used so that cold air is not blown into a house waiting for the gas flames to heat up enough before the blower turns on. Fan limit switch q a 5 furnace fan limit control troubleshooting.

I changed out the filters and it started up again. The specifications on the furnace limit switch are thermal limit open 190 f close 160 deg f. I did some research and thought it was due to a clogged filter. This means that this limit switch opens and cuts off the gas burners when the temperature inside the furnace heat exchanger reaches 190 f and closes back to allow the burners to come back on when the heat exchanger reaches a temperature of 160 degrees f.

I would try a reset it may have been a fluke that it tripped if the reset dosent trip again it is probably fine.

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