• 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 see if the thermostat makes a Heat or Cool call

• If display does not indicate a call for Heat or Cool or WAITING FOR EQUIPMENT, verify the mode setting, temperature setpoint and room temperature

If the Up or Down arrow is pressed:

• Upper left of display shows mode setting

• Upper right shows setpoint

• Center of display shows room temperature

If the 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

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

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

• Verify that ISU 2060 is set correctly Verify that no wires are shorted. Look for exposed sections of wire at the UWP

• Verify display does not indicate HEAT ON or COOL ON

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

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

• Verify the mode setting (Heat, Cool or Auto in upper left of display)

The setting ranges for these modes are:

• 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)