11
Tips and assistance
32
Tips and assistance
Questions and answers
Question
Possible cause
Possible solution
is displayed (top
right on the display)
Instrument battery is
almost spent
Replace instrument
battery
Instrument switches
itself off
Auto Off function is
switched on
Remaining battery
capacity is insufficient
Switch off Auto Off
function
Change the battery.
Display responds
sluggishly
Ambient temperature is
very low
Increase ambient
temperature
Display: ----
Sensor error
Please contact your
dealer or Testo
Customer Service.
Display: OOOO
Permissible measuring
range has been
exceeded
Keep within the
permissible measuring
range
Display: UUUU
Permissible measuring
range has been
undershot
Keep within the
permissible measuring
range
Display: BT Fail
Bluetooth connection
could not be established
Check Bluetooth
®
connections.
Restart measuring
instrument, restart
testo Smart App.
Display: Print Fail
Printout could not be
performed successfully
Check Bluetooth
®
connections.
Switch printer off and
then on again.
Display: Probe Fail
Probe damage
Please contact your
dealer or Testo
Customer Service.
Display: OTA Fail
The update process
"over the air" of the
measuring instrument
could not be completed
successfully.
Restart the measuring
instrument and testo
Smart App and check
the Bluetooth
®
connection.
