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25 User Manual
Status Indicators
Status indicators appear in the display to let you know if your system is heating, cooling or off.
HEAT ON
Heating system is running.
COOL ON
Cooling system is running.
AUX
Auxiliary stage of heating is running
(multi-stage systems only)
EMER
Emergency heating system is running
(heat pump systems only)
CHECK
There is a potential problem with your system.
Contact a local service technician.
SERVICE
User selectable service reminder for changing a
filter, UV air purifier bulb or humidifier pad
(See Service Monitors, page 10)
ADJ
Temperature adjustment limit has been reached
Thermostat is connected to control module (flashes if connection is lost)
Thermostat battery is low
(see section 6)
NO AC
AC power to system has been lost
Status
Indicator