TESTO 557 - Error reports

8 Tips and assistance
24
8.3. Error reports
Question Possible causes/solution
---- lights up instead of the
temperature display (T1/T2
or toh/tcu)
Sensor or cable faulty
> Please contact your dealer or
Testo Customer Service
---- lights up instead of the
display for superheating /
subcooling (SH/SC or
Δtoh/Δtcu)
- No actual superheating /
subcooling.
- No theoretical condensation or
evaporation temperature can be
calculated based on the pressure
measured.
Display EEP FAIL Eeprom defective
> Please contact your dealer or
Testo Customer Service
Display BT ERR
No BT module connected or BT
module defective.
> Please contact your dealer or Testo
Customer Service
Display ERR 1-5 Vac-Probe defect
> Please contact your dealer or
Testo Customer Service
If you have any questions, please contact your dealer or Testo
Customer Service. The contact details can be found on the back of
this document or on the Internet at www.testo.com/service-
contact..