[Bugsinrugs]

I'll call a technician if I can't figure this out first.
My furnace won't come on, I know the thermostat works as the fan comes on when put in that mode. When switched to cool the air conditioner starts. I pulled and cleaned the flame sensor then reinstalled but nothing. I did a continuity test on the ignighter and it's good. Asking if there is anything else I can test before calling in a pro.