22
Fault Flash
Sequence
Fault
Possible Causes
Corrective Action
1
Motor Underload
Air-locked pump. Overpumped or dry
well. Worn pump, damaged shaft or
coupling, blocked pump or pump screen.
Wait for well to recover and auto restart to
occur. (See description in Underload (Dry
Well) section). If the problem persists, check
pump and motor.
2
Overvoltage
Misconnected input leads.
Incorrect sizing of solar array.
Ensure array wiring is correct.
Check series/parallel connections.
Confirm array ratings are within Fhoton™
Drive input range.
3
Locked Pump
Motor/pump misaligned.
Pump bound up with sand or abrasive.
Dragging motor or pump.
Unit will attempt to free a locked pump. If it
is unsuccessful, check the motor
and pump.
4
Low Flow Trip
Flow switch miswired.
Flow switch clogged.
Inadequate power to generate flow.
Motor wired incorrectly.
Check that “FLOW SWITCH” terminal is
correctly wired to flow switch.
Check that flow switch is properly installed in
pipe discharge.
Check that the flow switch is not clogged.
Check that pipe discharge is not blocked.
Wait for sufficient solar power to pump
adequate water.
Check that the motor is wired correctly and
spinning in the correct direction.
5
Open Circuit
Loose or open connection to motor.
Defective motor or cable.
Check motor cable connections.
If problem persists, check cable and motor.
6
(a) At power-up: Short Circuit
(b) While running: Over Current
(a) Short in motor connections at
terminal or within motor cable.
(b) Debris in pump.
(a) Check motor connections at terminal.
(b) Check pump.
If problem persists, check motor cable
and pump.
7
Overheated Controller
Unit in direct sunlight.
High ambient temperature.
Obstruction of air flow.
Shade unit.
Clean any debris from heat sink fins on rear
of enclosure.
This fault automatically resets when
temperature returns to safe level.
9
Internal Error
Controller internal processing has
encountered an incorrect value.
Cycle input power.*
Table 6: Fault Code / Troubleshooting
* “Cycle input power” means disconnecting PV power (if used) for at least five minutes, then re-connecting power.
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