"Rick" wrote in message
.net...

"FordTech" wrote in message
oups.com...
Hello,

My furnace recently started this. It goes thru the normal cycle
but
intermittently will continue burning after the blower shuts down.
It
will burn for maybe 30-45 seconds or so after shut down... then
burners
off. Then after about 30 seconds the blower will come back on for
about
30 seconds.

It just had its bi annual checkup with the local HVAC company
about
30
days ago and the only notation they made was possible low
batteries
in
the thermostat. I replaced those shortly after the service because
I
noticed this problem on the first use of the furnace, and
unfortunately
have procrastinated finding the root cause since.


The first thing I would look at is the fan/limit switch, too...

Then the blower motor relay. Seen a few with intermittant solder
connections where the coil windings attach to the terminals...