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Trouble-shooting
Error message Situation Solution
No lens filter is attached. Attach new, clean lens filter.
The thermometer cannot identify
a secure position of the probe. An
accurate measurement was not
possible.
POS = position error
IRT 4020: Clear the display by
pushing the «start» button once.
IRT 4520: Clear the display by
pushing the «I/O» button once.
Take care that the positioning of
the probe is correct and remains
stable.
Ambient temperature is not within
the allowed operating range
(10 – 40 °C or 50 – 104 °F).
Allow the thermometer to remain
in a room for 30 minutes where
the temperature is between
10 and 40 °C or 50 and 104 °F.
Temperature taken is not within
typical human temperature range
(34 – 42.2 °C or 93.2 – 108 °F).
HI = too high
LO = too low
Make sure a new, clean lens filter
is attached and thermometer is
properly inserted. Then, take a
new temperature.
System error – self-check display
flashes continuously and will not
be followed by the ready beep
and the ready symbol.
If error persists,
If error still persists,
Wait 1 minute until the
thermometer turns off
automatically, then turn
on again.
... reset the thermometer by
removing the batteries and putting
them back in.
Please contact your authorized
service centre.
Hong Kong service center contact
number: +852 2686 3319
Taiwan service center contact
number: +886 0800278789
China service center contact
number: +86 021-61280577
Singapore service center contact
number: +65 65522422
Trouble-shooting
Situation Solution Error message
Battery is low, but thermometer will
still operate correctly.
Insert new batteries.
Battery is too low to take correct
temperature readings.
Insert new batteries.
Do you have any further questions?
Please contact your authorized
service centre
Hong Kong service center contact
number: +852 2686 3319
Taiwan service center contact number:
+886 0800278789
China service center contact number:
+86 021-61280577
Singapore service center contact
number: +65 65522422
Replacing the batteries
The thermometer is supplied with two 1.5 V type AA (LR 06) batteries.
For best performance, we recommend Duracell alkaline batteries.
Insert new batteries when the battery symbol appears on the display.
Open the battery compartment. Remove the batteries and replace with
new batteries, making sure the poles are in the right direction.
Slide battery door back until it snaps in place.
To protect the environment, dispose of empty batteries at your
retail store or at appropriate collection sites according to national
or local regulations.
Calibration
The thermometer is initially calibrated at the time of manufacture.
If this thermometer is used according to the use instructions, periodic
re-adjustment is not required. If at any time you question the accuracy
of the temperature measurement, please contact your authorized
service center.
Hong Kong service center contact number: +852 2686 3319
Taiwan service center contact number: +886 0800278789
China service center contact number: +86 021-61280577
Singapore service center contact number: +65 65522422
The manufacturing date is given by the serial numbers located on the
product. The first three digits represent the day of the year of
manufacture. The next two digits give the last two numbers of the year
of manufacture. An example: SN: 25008knnnnn-this product has been
manufactured on the 250th day of the year 2008.
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