| Display is Blank | The thermostat gets its power from the indoor air handler, or if gas furnace from a 120 volt outlet. If these have power. |
| Time is not Correct. | Wait for about one minute after power interruption for the system to reset the time. If the time is still not correct after several minutes |
| Display is Flashing | • If flashing between time and temperature setpoint - Normal operation for the unit. |
| • If flashing COMM ERR. |
| • If flashing AUX and +2 - Normal operation. With a heat pump, indicates the resistance strip heat (Aux) is operating in conjunction with the heat pump compressor. |
| • If +2 on lower right of display - Normal operation. For a two-speed compressor, indicates that the compressor is operating in the high speed. |
| • If flashing HOLD - Normal operation. Indicates a temporary hold is in place. Press RUN to reset |
| The green light stays On, it does not flash (Green light next to the UP/DOWN buttons). | Normal operation. Indicates that a Critical Event is in effect |
| The green light stays On, it does not flash, the UP/DOWN buttons do not work | If the green light is On and the buttons will not change the display, your thermostat may need service |
| Display numbers/segments are fading out | The thermostat requires service |
| STG 1 is indicated but the unit is not running | • Verify that the breakers are not tripped for both the air handler and the outdoor compressor. Reset the breakers. If power is being supplied to the equipment, and the thermostat indicates the system is On (STG 1 icon displayed), call your heating and cooling contractor. |
| • If outdoor AC breaker is tripped, reset it, and then if it trips again, call your heating and cooling contractor. |
