Honeywell RTH8500 - Manuel (Page 21)

RTH8500
19 69-2220EF—03
If you have difficulty with your thermostat, please try the following suggestions.
Most problems can be corrected quickly and easily.
Display is blank • Check circuit breaker and reset if necessary.
• Make sure power switch at heating & cooling system is on.
• Make sure furnace door is closed securely.
• If thermostat is battery powered, make sure fresh AAA alkaline
batteries are correctly installed (see page 18).
Button on lower
right of screen is
blank • This button will remain blank unless the furnace filter change
reminder is activated (see System Setup in your Installation Guide).
In case of difficulty