Honeywell RTH8500 User Manual download pdf (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

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Honeywell RTH8500 User Manual Page 21