SQFlex Service Instructions

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8. CU 200 indicates
‘F4 = overload’.
Too low input voltage.
• Increase the supply voltage, to 30 VDC or
higher.
Pump is defective.
• Repair or replace the pump.
Only helical rotor
pumps. Pumped liquid is
contaminated with oil or
similar substance.
• Clean the liquid and replace the pump.
Motor liquid low / Missing.
• Check or refill motor liquid.
9. Green indicator light
in ON/OFF button is
flashing.
Insufficient power supply.
• Increase the number of solar modules or con-
nect an alternative energy supply, such as wind
turbine, batteries or generator.
Pump has seized up.
• Clean the pump.
10.Running light on CU
200 but low wattage.
System not grounded.
• Check system for adequate grounding
Pump is defective.
• Repair or replace the pump.
If a centrifugal pump is used: Check that the riser
pipe is not blocked.
11. No light in front
cover. Pump delivers
water.
CU 200 is defective.
• Replace the CU 200.
Ribbon cable not
mounted.
• Mount the ribbon cable.
12.Pump does not stop
when water reservoir
is full.
Fault indicator light
on CU 200 is off.
Level switch is dirty or
defective.
• Clean or replace the level switch.
Cable on level switch is
damaged.
• Replace the cable.
13.Pump does not stop
when water reservoir
is full.
Fault indicator light
on CU 200 is on.
CU 200 is defective.
• Replace the CU 200.
14.Pump does not start
when water reservoir
is empty.
Water reservoir indi-
cator is on.
Level switch is defective.
• Replace the level switch.
Cable on level switch is
damaged.
• Replace the cable.
CU 200 is defective.
• Replace the CU 200.
Indication/Fault Possible cause Remedy
sqflex_SI_US_WG.book Page 11 Thursday, October 1, 2009 3:27 PM