hope this helps:
couldn't find Ace persay online, I am sure on your package or thermo,
they have a contact or troubleshooting email or phone.


This site generally might help you:
http://www.thermostatusa.com/Tech.asp



On Wed, 08 Feb 2006 14:33:38 -0900, Steve Thrasher
wrote:

I recently bought a "Ace AT10-1141SA" thermostat. It seems to work OK
except that the temperature setting lever is off compared to the switch
action. Meaning that in order to get the room to 70F, as it indicates,
I need to set the lever to around 78F. I can hear the switch "kick" at
78F so I know that it's the thermostat. Since this the only problem I
hesitate to replace it. Does anyone know of a way to recalibrate it?