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9. Troubleshooting
Fault
Instrument switches off after printing
Display cannot be zeroed.
and zero the probes again.
Saved settings and readings
are no longer held in the instrument.
Velocity value is calculated incorrectly
Velocity value is calculated incorrectly
Velocity value is calculated incorrectly
Volume flow is calculated incorrectly
cross-section
If we were unable to answer your question, please contact your distributor or Testo
Customer Service. For contact data, see back of this document or web page www.
testo.com/service-contact
Possible causes
Battery voltage too low
The differential pressure is outside
Factory reset was carried out or
battery was removed.
Density input incorrect
Pitot tube factor incorrect
Pressure probe not zeroed before
measurement
Offset factor or cross-section input incorrect
9. Troubleshooting
Remedy
Replace battery
Make the differential pressure < 2.5%
the zeroable range.
of full-scale value
No remedy possible! Keep readings
regularly in the software or on paper.
Enter correct density
Enter correct Pitot tube factor.
Zero pressure probe (without applying
pressure)
Enter correct offset or
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