Diehl HYDRUS 171A/B Guide D'installation page 26

HYDRUS
Error code Description
E1 Temperature measurement error (temp. outside range,
sensor short-circuit)
Meter should be checked in the event of sensor short-circuit
E4 Hardware error, faulty ultrasonic transducer or short-circuit
in ultrasonic transducer
Meter should be checked
E5 Too frequent reading (no communication possible for
short time)
E7 No meaningful ultrasonic signal, air in the measuring path
Alarms (Permanent visual indication on the LC display)
Alarm Description
messages
A1 Reverse volume
A3 no consumption
A4 Fault / failure of ultrasonic or temperature measurement
A5 Leakage alarm
A6 Low temperatures (below 3°C)
A7 Air in the measuring path, no volume measurement
A9 Low battery
Combinations of error and alarm messages can occur simultane-
ously, e.g. E-7-A-1, corresponds to E7 and A1.
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