In Case Of Difficulty - Honeywell RTH8500 Operating Manual

In case of difficulty

If you have difficulty with your thermostat, please try the following suggestions.
Most problems can be corrected quickly and easily.
Display is blank
Button on lower
right of screen 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).
• This button will remain blank unless the furnace filter change
reminder is activated (see System Setup in your Installation Guide).

RTH8500