Press button (pinhole) with a paperclip for 3 seconds. All schedules and settings revert to default.
A: No. The Thermotech TT-91 manual clearly states this is a heating-only thermostat. Using it for cooling will damage the compressor. thermotech tt-91 manual
The most searched section of the is the programming guide. The unit uses a 5-1-1 schedule (Weekday, Saturday, Sunday). Here is how to set it: Press button (pinhole) with a paperclip for 3 seconds