I got an odd one. 2005 Lennox high efficiency. Heat exchanger is good. Did a combustion test and stack temp and 02s are high and C02 is low and the CO is normal. Gas pressure is set at 3.2 and fan speed is on high. What do you guys think? Orfices need changed?

Posted by Spymoocow at 2025-02-26 21:46:45 UTC