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 ﬂash 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.

#of

Flashes

Fault

Possible Cause

Corrective Action

		Air-locked pump.	Wait for well to recover and
		Air-locked pump.	automatic restart timer to time
1		Overpumped or dry well.	automatic restart timer to time
	Motor	Overpumped or dry well.	out. If the problem does not
	Motor	Worn pump. Damaged	out. If the problem does not
	Underload	Worn pump. Damaged	correct, check motor and pump.
	Underload	shaft or coupling. Blocked	correct, check motor and pump.
		pump or screen.	See description of “Smart Reset”
		pump or screen.	on Page 26.
			on Page 26.

			Check for loose connections.
2		Low line voltage.	Check line voltage. Report low
	Undervoltage	Low line voltage.	voltage to the power company.
	Undervoltage	Misconnected input leads.	voltage to the power company.
		Misconnected input leads.	Unit will start automatically when
			the proper power is supplied.

3	Locked	Motor/pump misaligned.	Unit will attempt to free a locked
	Locked	Abrasive/Sand-bound pump.	pump. If unsuccessful, check the
	Pump	Abrasive/Sand-bound pump.	pump. If unsuccessful, check the
	Pump	Dragging pump or motor.	motor and pump.

4		Reserved for factory use
		Reserved for factory use

5			Check motor wiring. Make certain
	Open Circuit	Loose connection.	all connections are tight. Make
	Open Circuit	Defective motor or cable.	certain proper motor is installed.
			Cycle input power** to reset.

		When fault is indicated
	Short Circuit	immediately after power-up,	Check motor wiring. Cycle input
	Short Circuit	short circuit due to loose	power** to reset.
6		connection, defective cable,	power** to reset.
		splice or motor.

		When fault is indicated
		When fault is indicated
	Over Current	while motor is running, over	Check pump.
	Over Current	current due to loose debris	Check pump.
		current due to loose debris
		trapped in pump.

7	Overheated	High ambient temperature.	This fault automaticallyresets
	Overheated	Direct sunlight. Obstruction	when the temperature returns to a
	Controller	Direct sunlight. Obstruction	when the temperature returns to a
	Controller	of air-ﬂow.	safe level.

**“Cycle input power” refers to turning the power off until both lights fade off, then applying power again.