Honeywell RTH7500D User Manual

61

69-1730

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.

Heating system 

is running in 

cool mode.

Check Installer Setup Number 0170, 

Heating and/or Cooling System Type, and 

make sure the setting matches the installed 

heating and/or cooling system.

Heating system 

does not turn 

off and the heat 

temperature 

setting is set 

below the room 

temperature 

(“Heat On” is 

not shown in 

display).

Check Installer Setup Number 0170, 

Heating and/or Cooling System Type, and 

make sure the setting matches the installed 

heating and/or cooling system. 

Red LED is on 

in the upper left 

corner and the 

Heat Pump is 

not working.

A system monitor is wired to the thermostat 

L terminal. See Heating or Cooling system 

does not turn on in the Troubleshooting 

Tips.

69-1730.fm  Page 61  Tuesday, July 13, 2004  12:45 PM