I have a Lennox G26Q3/4-100-6. I noticed it was blowing cool air last night. I changed the filter, which was very dirty. Upon start up, the combustion blower energized but cut off after one second. The hot air blower continued going for several minutes. The LEDs: #1 slow flashing, #2 on; indicating primary/secondary limit switch open. Today, the hot air blower doesn't stay on, and both LEDs are slow flashing together. I checked that the voltage at the combustion blower is also coming in for one second and then cutting off. I checked the condensate plumbing, and it's clear. I jumpered the pressure switch; no change. The service manual doesn't have any suggestions that I can find. Controller? It's a SureLight White-Rodgers.
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