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The LCD is blank
No batteries installed
Install the batteries
Batteries used up?
Replace new batteries
Batteries in wrong polarity? Take out battery, adjust batteries to
proper polarity
The thermometer power off
automatically
Power on the device again
LCD shows Lo or Hi
Exceed measurement
range
Body mode:
＜
32.0
℃
(89.6
℉
) display
Lo;
＞
43.0
℃
(109.4
℉
)
display Hi.
1 Make sure the probe tip and the
forehead cap is clean and there is
no obstruction prior to taking a
temperature
2 Make sure there is no air flux as
this could interfere with the infrared
system.
3 Make sure the measuring
distance is not too far during
forehead measure mode
measurement, distance should be
within 1.0cm to 3.0cm.
4 Ensure that the ear canal is clean
and the probe tip and ear canal are
closely matched when measuring
ear temperature.
LCD shows Er1
Ambient temperature too
low
Allow the device to remain in a
room for 30 minutes where the
temperature is range from 15
℃
(59.0
℉
) to 40
℃
(104.0
℉
)
LCD shows Er2
Ambient temperature too
high
LCD shows Er3
Ambient temperature
changes too quickly
LCD shows Er4
IR sensor or other
hardware failure
Turn off the device, then turn on
again, if still unable to use please
contact the factory
flash on LCD
The battery power is low
and the device can't be
used
Replace 2 new AAA batteries
