This sounds like something I would intentionally do to save on heating
costs. i.e. Program the thermostat to go down to about 60 in the late
evenings.

Find out the brand and model number of the thermostat. And the brand and
model number of the furnace. Next find the instruction manuals for these -
perhaps on the internet. Or ask here. If you are brave, ask on alt.hvac, but
you would need to give them brands and model numbers...


"dave" wrote in message
I just bought a house with a Rheem forced-air gas furnace upstairs with
an electronic pilot light and a manual thermostat. Here's the problem:
For about 17 hours every day it works fine. Every night around bedtime
it shuts down for several hours and won't restart. I've tried turning
it off and on. It just comes one for a few minutes, blows cold air and
shuts down. Can it be a bad thermostat if it works fine the rest of the
day? I'm confused and need some help. I'd call a service technician,
but he would come during the day, charge me a $100 service call, and
tell me it works fine. Help?