Furnace Limit Switch Open Error

The primary limit switch which prevents the furnace from heating to unsafe temperatures is programmed to reset automatically after a malfunction.

Furnace limit switch open error.

Coleman furnaces contain two internal safety components known as high limit switches that are designed to stop electricity from reaching the gas ignition valve if the furnace overheats to dangerous temperatures. Remove the cover by lifting it upwards or pulling it off to reveal the body of the switch and two metal arms. I have a frigidaire furnace model fg7tc o8od vc and the flashing green and no red lights tell me i have a open limit switch fault. Locate the white limit switch.

My york ly8s furnace is flashing 4 red code open limit switch the troubleshooting guide says this is dirty filters. Goodman residential furnaces contain multiple limit switches to ensure safe operation. Thank you so much my wife and three year old will appreciate the heat if it works. The filter has been replaced but still flashes 4 red.

A fault will appear when it s open or if it doesn t reset within a specified period of time during which the blower is expected to circulate enough air to cool the heat exchanger to. The code means that there is a limit switch open i will post a pic of one and describe where they are located so you can reset it need a minute or two full size image jacustomer pq8eizy8. The limit switch will open periodically to prevent over heating. Attempting to reset the furnace limit switch while the power is connected may result in electrical shock.

Limit switches turn off the burner and turn on the circulating fan if there is a high temperature condition in the furnace. Green light and r read more. The auxillary fan works and the blower motor seems to be working fine but no flame heat. Is there a reset.

If the furnace failure code indicates an open limit or open high temperature switch or open rollout switch it is probable that the furnace has overheated.