Honeywell RTH8500D Use and Care Manual download pdf (Page 60)

69-1725-1 60

Cannot set System

setting to Cool.

Check Installer Setup Number 0170, Heating

and/or Cooling System Type; make sure the

setting matches the installed heating and/or

cooling system.

“Heat On” is not

shown in the display.

Set the System setting to Heat and set the

temperature setting above the room

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 the Troubleshooting Tips.

“Cool On” is not

shown in the display.

Set the System setting to Cool and set the

temperature setting below the room

temperature. If “Cool On” is shown solidly in

the display, but the cooling system does not

turn on, see “Cooling system does not turn

on” in the Troubleshooting Tips.

“Wait” shows in the

display.

Compressor minimum-off timer is active. Wait

up to five minutes for the cooling or heating

system to turn on.

Fan does not turn on

in a call for heat

(electric furnaces

only).

Check Installer Setup Number 0180, Fan

Control in Heating, and make sure it is set to

Electric Heat.

Heat pump puts out

cool air in the heat

mode and warm air in

the cool mode (heat

pumps only).

Check Installer Setup Number 0190, Heat

Pump Changeover Valve, and make sure the

setting matches the changeover required by

the installed heat pump.

Both the heating and

cooling systems are

running at the same

time.

Check Installer Setup Number 0170, Heating

and/or Cooling System Type, and make sure

the setting matches the installed heating and/

or cooling system.

Check and make sure the bare portions of the

wires are not touching.

Troubleshooting Tips (Continued)

If . . . Then . . .

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