Diehl Hydrus - Messages and Technical Data; Error and Alarm Messages

9. Messages in the display
9.1 Error messages

Visual indication on the LC display in the event of an error
Error
code
Description
C1 Basic parameters in the ash or RAM destroyed (replace the
HYDRUS).
E1 Faulty temperature measurement (temperature out of range,
sensor short, sensor open).
In the event of a sensor short or a sensor open, replace the
HYDRUS.
E4 Hardware fault, defective ultrasonic transducer or short circuit
ultrasonic transducer (replace the HYDRUS).
E5 Too frequent readout (no communication possible).
E7 No ultrasonic signal, air in the measurement section.
9.2 Alarm messages

Constant visual indication on the LC display in the event of an alarm
Alarm
code
Description
A1 Reverse ow
A3 No consumption
A4 Malfunction / failure of the ultrasonic or temperature measure-
ment
A5 Leakage alarm
A6 Low temperature (below 37 °F)
A7 Air in the measurement section, no volume measurement
A9 Low battery charge
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HYDRUS
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