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8. Questions and
answers
This chapter gives answers to frequently asked questions.
Question Possible causes Possible solution
is lit (bottom left · Instrument battery is · Replace instrument
in display). almost spent. battery.
is lit (above · Radio probe battery · Replace radio probe
symbol). is almost spent. battery.
Instrument switches ·
Auto Off function Switch function off.
itself off. is switched on.
· Residual capacity · Replace battery
of battery is too low.
Display:
----- · Sensor is not plugged in. · Switch instrument off,
connect probe and
switch instrument
back on again.
· Sensor break. · Please contact your
dealer or Testo
Customer Service.
Display:
uuuu · Permitted measuring range · Keep to permitted
was undershot. measuring range.
Display:
oooo· · Permitted measuring range · Keep to permitted
was exceeded. measuring range.
Display:
no Signal · Registered probe · Register radio probe
was not found. again, see chapter
Performing settings,
objective To register
the radio probe.
Date/time are · Voltage supply was · Reset date and time.
no longer correct interrupted for a longer time
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