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8. Malfunctions and Corrective Action
Error A - 3 (device error):
Error A - 4 (device error):
U
ltrasound sensor receives no echo. The
water level cannot be measured. Check ul-
trasound sensor for dirt and alignment.
Check whether there are any obstructions
between the ultrasound sensor and the sur-
face of the water.
A further cause of errors can be excessive
disturbance/waves in the tank, check the
inlet calming device is working properly.
Error A - 5 (device error):
The ultrasound sensor measures a value
which exceeds the tank height.
Check the ultrasound sensor is properly ali-
gned.
An echo is also not returned if the base of
the tank is uneven.
8.3 Simultaneous errors
If two or more errors occur simultaneously,
only one error can be displayed. A priority
has been assigned to the types of errors to
simplify the troubleshooting. The error with
the highest priority is always displayed. If it
has been corrected and acknowledged with
the "T" button, the error with the next hig-
hest priority is displayed.
Sensor type:
Cause of error:
Ultrasound sensor Technical defect
Incorrectly connected
Short-circuit in the
connection lead
Interruption (break) in
the connection lead
Leakage probe
Technical defect
Incorrectly connected
Short-circuit in the
connection lead
Interruption (break) in
the connection lead
Probe type incorrectly
entered
Ranking
Error code:
1 (high)
A - 2
2
A - 1
3
A - 4
4
A - 3
5 (low)
A - 5