Honeywell RTH8500D Benutzerhandbuch

59

69-1725-1

Key to the right of the 

Screen key is blank.

Verify that this key remains blank unless you 

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 

do not change.

Check that the temperature settings are:

• 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 

not turn on.

• Set the system to Heat by pressing the 

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 

not turn on.

• Set the system to Cool by pressing the 

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.