58
Troubleshooting
Troubleshooting
First check the following points. If the following measures do not help remove problems, con-
tact your nearest distributor.
■ Pump
States
Possible causes
Solutions
The pump does not run
(
the operation LED
does not light or the
screen is blank.).
Power voltage is too low.
• Observe the allowable voltage range of
90-264VAC.
The pump is not powered.
• Check the pump is switched on.
• Correct wiring.
• Replace a breaking wire to new one.
Liquid can not be
pumped up.
Air lock in the pump
• Expel air. See page 35.
Air ingress through a suction line
• Check for the ingression point and fix/re
-
route the suction line as necessary.
An O ring is not fitted to a valve set.
• Fit O ring to the valve set.
Foreign matters are stuck in the pump
head valves.
•
Dismantle, inspect and clean the valves.
Replace as necessary.
A ball valve is stuck on a valve seat.
•
Dismantle, inspect and clean the valve.
Replace as necessary.
A vale seat has been pressed in the
valve guide.
• Do not push the valve seat into the valve
guide. See page 62.
A flow rate fluctuates.
Air trapped in the pump head.
•
Expel air. See page 35.
Overfeeding occurs.
•
Mount a back pressure valve to keep the
discharge line pressure constant.
Foreign matters are stuck in the pump
head valves.
•
Dismantle, inspect and clean the valves.
Replace as necessary.
Diaphragm is broken.
•
Replace the diaphragm. See page 63.
Pressure fluctuates at an injection
point.
•
Maintain the pressure constant by opti
-
mizing piping or by relocating the injection
point.
Liquid leaks.
A fitting is loose.
•
Tighten the nut to fix the fitting.
Loose fit of the pump head
•
Retighten the pump head. See page 34.
An O ring is not fitted to a valve set.
•
Fit O ring to the valve set. See page 62.
Diaphragm is broken.
A leak from the drain port (vent hole)
•
Replace the diaphragm. See page 63.
