Troubleshooting and Support

Display is blank

  • Check circuit breaker and reset if necessary.

  • Make sure power switch for heating & cooling system is on.

  • Make sure furnace door is closed securely.

  • Make sure fresh AA alkaline batteries are correctly installed See Battery Replacement

Heating or cooling does not run

  • When running heat, display will show HEAT ON in lower right of display.

  • When running cool, display will show COOL ON in lower right of display.

  • If display shows WAITING FOR EQUIPMENT under temperature reading, it is in compressor delay mode to protect the system. Wait 5 minutes to determine if the thermostat makes a Heat or Cool call.

  • If display doesn’t indicate a call for Heat or Cool or WAITING FOR EQUIPMENT, verify the mode setting, temperature setpoint and room temperature.

    If you press the or arrow

    • Upper left of display shows mode setting.

    • Upper right shows setpoint.

    • Center of display shows room temperature.

    If issue persists

    • Check circuit breaker and reset if necessary.

    • Make sure power switch at heating & cooling system is on.

    • Make sure furnace door is closed securely.

Heat or Aux Heat runs with Cooling

  • Verify there is not a wire attached to W for heat pump systems. See Wiring Diagrams.

  • For heat pump applications the reversing valve is energized in Heat on some heat pumps and Cool for other heat pumps. Verify ISU 2060 is set correctly.

  • Verify that no wires are shorted. Look for exposed sections of wire at the UWP.

Heat or Aux heat runs with no call for heat or cooling

  • Verify display does not indicate HEAT ON, COOL ON or AUX HEAT ON.

  • Verify there is not a wire attached to W for heat pump systems. See Wiring Diagrams.

  • Verify that no wires are shorted. Look for exposed sections of wire at the UWP wall plate.

Cannot change setpoint to desired setting

  • If display indicates UNLOCK next to the left center button, see Keypad Lockout.

  • If not, verify the mode setting (Heat, Cool, Auto, or Em Heat in upper left of display).

    The default setting ranges for these modes are:

    • Heat or Em Heat: 32 ºF to 90 ºF (0 ºC to 32.0 ºC)

    • Cool: 50 ºF to 99 ºF (10.0 ºC to 37.0 ºC)

    If the setpoint can be adjusted, but not to the full range shown above, the thermostat may be configured for a maximum heat or minimum cool setpoint to restrict settings that are energy inefficient.

WAITING FOR EQUIPMENT (Shown in display under room temperature)

  • The compressor protection feature is engaged. Wait a few minutes for the system to safely restart to avoid damaging the compressor. See the Built-in Compressor Protection section for more information.

     

Customer Assistance

For assistance with this product, please visit customer.resideo.com.

Or, call Resideo Customer Care toll-free at 1-800-633-3991.

5-year limited warranty

For Warranty information go to honeywellhome.com/support