Honeywell RTH8500D Owner's Manual - Page 59

Troubleshooting Tips If . . . Then . . . Key to the right of the Verify that this key remains blank unless you Screen key is blank. set the Furnace Filter Change Reminder. See Installer Setup Number 0500 in Step 11. Display is blank. Check that fresh AAA alkaline batteries are installed as marked on the thermostat. Temperature settings Check that the temperature settings are: do not change. • Heating 40°F to 90°F(4.5°C to 32°C). • Cooling 50°F to 99°F (10°C to 37°C). Heating system does • Set the system to Heat by pressing the not turn on. System key. • Check the heat temperature setting to be sure it is set above the room temperature and "Heat On" shows solidly in the display. • Check the circuit breaker to be sure it is not tripped. • Check power switch at heating and/or cooling system to be sure it is on. • Check the furnace door to be sure it is closed securely. • Wait five minutes for the heating system to respond. • If all of this was checked, contact your local heating and cooling contractor. Cooling system does • Set the system to Cool by pressing the not turn on. System key. • Check the cool temperature setting to be sure it is set below the room temperature and "Cool On" shows solidly in the display. • Check the circuit breaker to be sure it is not tripped. • Check the power switch at the heating and/or cooling system to be sure it is on. • Check the furnace door to be sure it is closed securely. • Wait five minutes for the cooling system to respond. • If all of this was checked, contact your local heating and cooling contractor. 59 69-1725-1