Dexcom G4 Platinum User Manual page 63

This icon means the receiver does not understand the sensor signal
temporarily. This icon is related to the sensor only. You should wait for
more prompts and do not enter any blood glucose values when you see
Glucose
this symbol.
Reading
Error
This icon means the receiver and sensor/transmitter are not
communicating. Make sure the receiver and sensor/transmitter are
within 6 meters of each other (see Chapter 1, Section 1.2, Transmitter
Out of Range
Overview).
This icon means the sensor cannot calibrate right now. If you see this
screen, enter at least one more calibration blood glucose value after about
10-15 minutes. If the sensor still cannot calibrate after that, the sensor
15 Minute
Calibration
needs to be removed and a new sensor needs to be inserted.
Error
This icon means the sensor is not calibrating correctly. If you see this
screen, wait a minimum of one hour and then enter one more blood
glucose value. If no readings display on the receiver after this, the sensor
1 Hour
Calibration
needs to be removed and a new sensor needs to be inserted.
Error
This icon means the receiver has detected a potential problem with the
sensor signal. You should wait about 30 minutes for more prompts. Do not
enter any blood glucose values when you see this symbol.
Wait
Dexcom G4 PLATINUM User's Guide | 63