American Standard thermostat error code

Error Possible CauseAction
System on indicator (flame=heat, snowflake= cool) is lit, but no warm or cool air is coming from the registers.Heating/cooling equipment turns on the fan when the equipment has reached the setpoint.Wait a minute after seeing the flame or snowflake and then check the registers.
System on indicator reads Filter and backlight is flashing.Filter expired.Refer to the Filter Indication section.
LED is lit.System switch is set to Em. Heat. Compressor failure.Move switch to Heat or Auto Contact service technician.