11
Tips and assistance
38
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.
Display: APP Lost
Connection to the testo
Smart App was
interrupted. Keys are
locked for 3 s.
Restart the measuring
instrument and testo Smart
App and check the
Bluetooth
®
connection.
If we have not been able to answer your question: please contact your local
dealer or Testo Customer Service. See the back of this document or the
www.testo.com/service-contact web page for contact details.
