How do I unlock a programmable thermostat for central air/heat?

The area I live in recently lost power for a couple of hours. When the electrical service was restored, the thermostat was locked. Any ideas on what I can do to unlock it so I can program our comfort level.How do I unlock a programmable thermostat for central air/heat?You'll need to find the manufacturer's website and look around there for an instruction manual to download.How do I unlock a programmable thermostat for central air/heat?see if there s a reset button either inside or on the outsideHow do I unlock a programmable thermostat for central air/heat?With about 250 different thermostats out there this would be mind blowing.