Honeywell TH5110D Owner's Manual - Page 21

Troubleshooting Tips (Cont) If . . . Then . . . Cooling • system does not turn on. • Set the system to Cool by pressing the System button. Check the cool temperature setting to be sure it is set below 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. "Heat On" is Set System setting to Heat and set the not shown in temperature setting above the room the display. temperature. If "Heat On" is shown solidly in the display, but the heating system does not turn on, see "Heating system does not turn on" in Troubleshooting Tips. 69-1713 21