Furnace out this morning. Lennox, 5 year old system.

Georgetown PA

Description

It will turn on, and then run for a little bit, and then turn off. There's not pilot, it's a newer system. I have a nest. It'll turn on, and then off, and not come back on for hours. It's been off since yesterday afternoon, and it's like 43 in my house currently. My contractor friend said it's most likely a simple fix on a relay or sensor? He's not sure, he's not HVAC. Any help would be greatly appreciated.