Troubleshooting

Display is blank

Check circuit breaker and reset if necessary.
Make sure power switch for heating & cooling system is on.
Make sure wire connections (especially C wire) are secure.
Verify the R/Rc slider switch is set up if Rc doesn’t have a separate wire attached.

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 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

Heat or Aux Heat runs with Cooling

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

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

Cannot change setpoint to desired setting

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

The 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)

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.

Display is blank	Check circuit breaker and reset if necessary. Make sure power switch for heating & cooling system is on. Make sure wire connections (especially C wire) are secure. Verify the R/Rc slider switch is set up if Rc doesn’t have a separate wire attached.
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 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
Heat or Aux Heat runs with Cooling	Verify there is not a wire attached to W for heat pump systems. See Wiring. 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.
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. Verify that no wires are shorted. Look for exposed sections of wire at the UWP.
Cannot change setpoint to desired setting	Verify the mode setting (Heat, Cool or Auto or Em Heat in upper left of display) The 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)
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.