Gary Stone wrote:

Hi, I've got a forced air propane furnace, Luxaire model GSU082MF Series
NAGOE (could be a Q) serial #1310002
Controlled by a Honeywell T87F heat only thermostat. This morning I was
down in the basement and noticed that it had the initial ignition then
that cut off after a while (normal burn) then a couple of minutes later a
second
ignition which ran a couple of minutes, when that cut off I headed up the
stairs only to hear it kick in a third time for a couple of minutes. Total
time for this was about 10 to 13 minutes. Before I went down there I had
moved the thermostat only to the point which it kicked in, 60 F from 58
F so, it wasn't that drastic a jump. Yeah, I like it on the cool side. The
outside temp was 19 F. I do not remember it ever acting in this manner
and suspect there might be a problem, Yes? No? Thanks for any input.

Stone

I'm no expert, but here's my $0.02. Seems like your thermostat has lost the
normal hysteresis that prevents this problem. There's a slide-wire heater
in the thermostat called an anticipator. Try moving the slide slightly to
clean up a poor contact.

Another possibility: did you relocate the 'stat or rearrange furniture such
that it is now in a strong airstream from a register?

If all else fails, buy another furnace or move.

Roby