Honeywell CT3400 Owner's Manual - Page 17

Then set the system switch. HEAT: The thermostat controls your heating system. HEAT OFF COOL OFF: Both the heating and air conditioning systems are off. HEAT OFF COOL COOL: The thermostat controls your air conditioning system. HEAT OFF COOL 29 69-0733-3 Troubleshooting Guide IF... Display does not come on. THEN... s Set the system switch to OFF. Remove batteries. Insert back- ward for at least five seconds to reset thermostat. Replace batteries correctly. Display should come on. s Make sure batteries are fresh and installed correctly. s Gently clean battery contacts using a soft pencil eraser. Do not use anything abrasive on the clips. Display flashes during programming. s You have reached the temperature setting limit. The setting range is 45°F to 88°F (7°C to 31°C). Temperature change occurs at the wrong times. s Check the program times for the period in question. Be sure that AM and PM indications are correct. Make sure the current day and time are correct. Reprogram if necessary. s If you left the thermostat set for Adaptive Intelligent Recovery™, the start times will occur before your programmed comfort periods. 30 69-0733-3