When I setup programmable 7 day rct-8100a honeywell thermostat for AC, and replace the cover, it appears everything resets, and I get an error code 2.7 and the time begins to flash like it was never set.

When I have the thermostat set to just a temperature, and not associated with programmable timing, the AC works just fine.

Thank you for all of your help!

Sometimes you have to read,, read,, and re-read the programing instructions, step by step and in order sometimes they can be a big pain