Last Jan. WE had the same problem. The furnace would start up then try to fire the gas but it woldn't happen then it would shut down. Open the furnace panel on the outside. Check on the left side and there is a circuit panel back there with a plug in wire. It had come loose on mine, still in place but loose. I plugged it in tight and solved my problem. The gas would then fire off. Anyway it's easy to check.
Okie
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