Lennox Furnace Troubleshooting Codes

Many furnaces nowadays have some kind of diagnostic system that allows owners to monitor and maintain the furnace in a limited way. The Lennox furnaces have this system.

If you have a Lennox furnace then it is strongly advised that familiarize yourself not only with the codes but the general running of the furnace to save you having to call in professionals for minor problems, thus accruing unnecessary expenses.

Lennox furnace troubleshooting codes are intended to make it easier for you to diagnose any problem you might have with your furnace. Though Lennox makes reliable furnaces, occasionally due to issues like prolonged use, you may find a problem.

The Lennox furnace error codes are a handy way of giving owners an opportunity to fix a minor glitch for themselves without resorting to costly call outs from repairmen. However, if you are unsure of the problem and how to fix it, or you don’t consider yourself very technical, it may be better to call someone in rather than risk making the problem worse.

In order to find the Lennox furnace troubleshooting codes you should look for the LED display. The codes themselves are not cryptic numbers or letters, instead they are patterns created by the flashing LED display.

It is a little like Morse code, the LED will flash in a particular sequence, three short flashes and one long, for example. This code should be noted down and then either looked up in the manual or more often, a list is recorded somewhere on the furnace itself, usually on the inside of the door.

The most likely problems that are diagnosed through LED codes are as follows:

  • Ignition failure – in which case the power needs to be turned off to reset it
  • Open pressure switch
  • Open limit switch

These problems are easily remedied with little technical know-how. However if the problem persists there is an underlying reason for the fault that has not been addressed. Parts do not usually go wrong without a good reason.

If you are at all worried about how your furnace is functioning, then calling in a professional will give you peace of mind.

Originally posted 2011-05-17 06:07:38.

One thought on “Lennox Furnace Troubleshooting Codes

  1. sabrina spurgeon

    i bought an old building, it has a lennox central air unit in it, it still works. i found some papers to unit,i believe it is a G14 series unit.the only numbers i see on the papers are 501,860M—9/84—supersedes 7/84. and then on model number it has G14Q3 or Q4 40, 60, and 80 series. or G14Q5-80 series. can anyone give me any info on what year this is and what kind and just any info. I would need to give someone who was interested in buying the unit? phone number is ************* or email is *********@yahoo.com. thank you

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