payne plus 90 - no flame
I got back from vacation and asked my father to turn my furnace up to 70 before my family got back to house. I got to house and thermostat was at 59, set for 70. Furnace cycles but no flame. Replaced ignitor which seemed to fix problem, furnace came on flame kicking out heat went to get family returned a few hours later to find temp was at 68 set for 72 and furnace is doing same thing, cycles no heat. The temp out side is around 15 so I thought maybe the ignitor was bad, or I damaged it going in so i bought another for $25 and put it. Furnace did same thing started up fine flame on and heated the house from 58 to 68 and now the same problem is occuring heater cycles and does not kick out a flame. Trouble code flashes 31; outside vents clear and unobstructed. Any suggestions would be greatly appreciated, thanks.