TESTO 315-3, Instruction Manual

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8 Tips and assistance
18
8 Tips and assistance
8.1. Questions and answers
v
Question Possible causes/solutions
flashes and
E145
lights up
The instrument temperature is outside
the permissible range:
> Let the instrument warm up or cool
down.
flashes and
E161
lights up
or
flashes and E419
lights up
or
flashes and E999
lights up
A serious error has occurred:
> Contact your dealer or the Testo
Customer Service.
flashes and E290
lights up
The current CO
2
measuring value is too
high for an adjustment:
Acknowledge the error message with
[Hold/Max/Min] and carry out the
adjustment again in fresh air (CO
2
measuring value < 650 ppm).
flashes and E420
lights up
Fan is blocked
> Please check if any item sticks in
the ventilation slot on the back of
the instrument. After 90 seconds,
the fan is started again.
> If there is nothing directly visible,
please contact your dealer or the
Testo Customer Service.
, calibration and
CO
2
flash
CO
2
sensor must be adjusted
> Adjust CO
2
sensor in fresh air.
flashes Battery capacity too low
> Connect the mains unit.