I work on Carrier/Bryant furnaces for a property. Their model # starts 394GAZ.
I have furnaces that are shuting down over night. Working during the day. Possibly after a reset. Sometimes I have certain devices replaced. Like - 3wire pilot, Ignition module, and circuit board. In one instance, I have replaced the gas valve.
But then I have an overnight shutdown on a resident. What is the culprit to this?
the night problem could be thru the stat,if it has multiple settings forrsay after 9PM it looks at a 50F setting.if your running a round honeywell with heat only no setbacks to touch then it is just maint.