I have a 1 year old American Standard Gas hot air Freedom 90 Comfort R furnace. This was purchased brand new from a Trane/American Standard dealer. Woke up to a house with temp in the mid 50's this morning. Blower was running continuously with just cool air blowing. Couldn't turn off the blower...tried both turning down thermostat to < 50, set thermostat to off, and blower kept running. For the fun of it, turned off the emergency power switch to the furnace for a few seconds and turned it back on. Heat returned and has been working fine all day.
I had a call in for service but they were very busy and wasn't sure if they'd be able to get here (didn't want to pay the after hours fee) so that's why I tired the power off/on. When I called up to tell them the furnace was working again and what I did, the operator at the furnace repair said she would ask a service tech on why it all of a sudden worked again. She called back (I did not get a chance to talk to tech directly) and told me what the tech said which was turning the switch off/on reset something, but the furnace would certainly fail again.
Question: Without him seeing the furnace, should I trust his word that this will definitely fail again? What actually possibly could have failed? Does that mean this could fail tomorrow, next week, 2 years from now? I was surprised to have this happen to such a new furnace (1 year old almost to the date).
Thanks for any feedback.