I have a newer furnace (about 18 months old) in a new home (just as
old). I noticed the other day that I heard the furnace exhaust fan
go, followed by the gas starting to burn. A few minutes went by and
the blower never kicked in. After a few minutes, I checked the
thermostat. It read "Heat On", but it wasn't blowing any air. At
this point, the gas had to be burning for 5 minutes. I turned it to
"Off" and then back to "Auto". It then went through the same
routine.... exhaust on, gas on and finally followed by the blower. I
thought it was weird and figured I would keep my eye on it.
Today, I notice it was a bit cold in the house, but didn't think
anything of it. I got up and heard the gas running again, but noticed
that the furnace wasn't blowing. I checked the thermostat again.
This time, the thermostat was set to 70 degrees, but was currently 68
degrees and read "Heat On" again. Again, I switched it to "Off" and
back to "Auto" again and it everything kicked in as expected.
I, by no means, am an HVAC expert. I am obviously going to call the
HVAC company in tomorrow (too late tonight) to have them take a look
at it. I was just hoping that I could get a heads up to what might be
the problem so that I'm not taken tomorrow.