System Status and Maintenance Indicators
Status indicators are messages or symbols that appear in the display to let you know what function your system
is currently performing. They are also used to inform you of various service and maintenance functions.
HEAT ON The heating system is running.
COOL ON The cooling system is running.
HEAT ON AUX The auxiliary stage of heating is running
(multistage systems only).
EMERGENCY
The emergency heating system is
HEAT ON running (heat pump systems only).
Indicates that the system fan is running.
HUMIDIFY Thermostat is calling for humidification
(model 4235 only).
DEHUMIDIFY Thermostat is calling for dehumidification
(model 4235 only).
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