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Diagnostic Fault Codes
Should an application or system problem occur, built-in diagnostics will
protect the system. The red “FAULT” light on the front of the SubDrive300
controller will fl ash a given number of times to indicate the nature of the
fault. In some cases, the system will shut itself off until corrective action has
been taken. Fault codes and the recommended corrective action for each
are listed in the following chart.
** “Cycle input power” refers to turning the power off until both lights fade off,
then applying power again.
# of
Flashes Fault Possible Cause Corrective Action
1
Motor
Underload
Air-locked pump.
Overpumped or dry well.
Worn pump. Damaged
shaft or coupling. Blocked
pump or screen.
Wait for well to recover and
automatic restart timer to time
out. If the problem does not
correct, check motor and pump.
See description of “Smart Reset”
on Page 26.
2
Undervoltage
Low line voltage.
Misconnected input leads.
Check for loose connections.
Check line voltage. Report low
voltage to the power company.
Unit will start automatically when
the proper power is supplied.
3
Locked
Pump
Motor/pump misaligned.
Abrasive/Sand-bound pump.
Dragging pump or motor.
Unit will attempt to free a locked
pump. If unsuccessful, check the
motor and pump.
4
Reserved for factory use
5
Open Circuit
Loose connection.
Defective motor or cable.
Check motor wiring. Make certain
all connections are tight. Make
certain proper motor is installed.
Cycle input power** to reset.
6
Short Circuit
When fault is indicated
immediately after power-up,
short circuit due to loose
connection, defective cable,
splice or motor.
Check motor wiring. Cycle input
power** to reset.
Over Current
When fault is indicated
while motor is running, over
current due to loose debris
trapped in pump.
Check pump.
7
Overheated
Controller
High ambient temperature.
Direct sunlight. Obstruction
of air-fl ow.
This fault automaticallyresets
when the temperature returns to a
safe level.