Lennox lighting problems - http://www.hvacmechanic.com/ Forums
Original message
| TedFred
 |  "Lennox lighting problems"
, posted Thu 16 Oct 14:35:  
Have a Lennox G43UF gas furnace that doesn't light?? I'm pretty much below novice level when it comes to furnace repair but here is what I do know. Tstat calls for heat and the unit begins the process. Led code is normal operation at this point. After approx. a minute it shuts down after not lighting. Led then codes no red, and a slow green flash which means pressure switch open, blocked inlet/exhaust vent or pressure switch closed prior to activating combustion. I have looked through window to see if there was any ignition and I saw nothing that resembled fire or hot. Am going to check pressure switch but I don't really know what to do with it. Checked gas supply and it should be getting gas?? Any thoughts or is more info needed?
OK, i found the pressure switch, but other than checking the 2 wires going to it and the connections, I can't find anything to do with it?? Thoughts? Thanks!!
[this message was edited by TedFred on Thu 16 Oct 18:11] |
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| theduke03
| "Re(1):Lennox lighting problems" , posted Thu 16 Oct 19:09
It's never the pressure switch. Locate where air intake pipe connects to the burners. Dissassemble that connection and look for leaves clogging the screen. Check both vent pipes outside as well.
"My dad was the most feared furnace fighter in Northern Indiana."
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