TESTO 557, Instruction Manual

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8 Tips and assistance
22
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
∆ toh/ ∆ tcu)
- 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 2 - 5
Damaged vacuum sensor
> Please contact your dealer or
Testo Customer Service
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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. .
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