ABB ACQ580 Firmware Manual page 366

362 Fault tracing
Code
Fault / Aux. code
(hex)
0xD403 Low level
Programmable fault:
LC low level action
0xD404 Running dry
Programmable fault:
Dry run protection
Cause
Water level is reached the low
level limit. Level control is
76.92
unable to control the level for
the following reasons:
• running out of pumping
capacity or
• analog feedback sensor
failure.
Dry run protection is activated.
82.20
What to do
Check the analog level sensor.
Check that all pumps are operating
normally.
Check parameters 76.90 LC low level
switch and 76.92 LC low level
Check the pump inlet for sufficient
water level.
Check dry run protection settings in
parameters 82.20 Dry run protection
and 82.21 Dry run source.
action.