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Tim H.
Tim H., HVAC Professional
Category: HVAC
Satisfied Customers: 3971
Experience:  Experienced in all aspects of HVAC, both residential and commercial.
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I have a problem with my lennox furnace---LED blinking code

Customer Question

<p>I have a problem with my lennox furnace---LED blinking code 2 and sometimes code 3</p><p>I will need to have enough info to diag this problem</p><p>update- seems the led functions as a status monitor as well. Can you please aid me in retriveing the correct LED code chart and status monitor info. Has one LED that is red and board says its #1(led1).</p><p>Thanks</p>
Submitted: 6 years ago.
Category: HVAC
Expert:  Tim H. replied 6 years ago.
Thanks for giving me the opportunity to help! There are two LEDs on this furnace and together they form the code. See chart in this manual. Check to see what code you have and let me know.
Customer: replied 6 years ago.

There is only one LED---

I may have fixed it I am monitoring the function and will see what happens

Again--- only ONE LED

Expert:  Tim H. replied 6 years ago.
You must have the early G24 board shown in the manual. 2 flashes indicates loss of flame sensed. Try cleaning flame sensor.
Customer: replied 6 years ago.


I may have fixed this thing already----

Found ignitor wiring connector arcing to ground, also cleaned burners of build up, reinstalled components and system seems to work fine. I will monitor to determine if indeed has been fixed

Thanks but I fixed this last night I presume


Expert:  Tim H. replied 6 years ago.
OK, keep me posted.
Customer: replied 6 years ago.
Thanks, XXXXX XXXXX let you know the results
Expert:  Tim H. replied 6 years ago.