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Error
Power switch is ON,
1
but power lamp does not turn
on
(or goes off during operation.)
Power lamp is ON,
but the pump does not rotate
(or stops during operation.)
2
3
Pump makes an abnormal
Pump rotation is not smooth.
4
Pump rotates,
but coolant does not circulate
5
(or flow rate is low).
6
Leakage of upper joint of water
diversion assembly
NEVER TOUCH the motor shaft with a hand or tool at operation
Overload protection switch
※1.
Overload protection switch：If the pump is overloaded, the pump will stop and the red button of
overload protection switch will eject.Please manually solve the overload fault, and then manually press the
red button to reset, and then start the machine again.
Use a screwdriver to assist in turning the motor shaft.（Note: the overload protection switch is
※2.
located at No. 36 in the figure on the next page）
Left side panel of the unit (left) and motor inside the unit (right).
Probable causes
Power has not supplied. Check the power switch at the power box
Fusion of the power
fuse.
Overload protection
switch trip※1
•No coolant freeze-up.
•Coolant freeze-up.
• Abnormal power input
voltage
Pump failure
The coolant components
are firmly fixed inside
the pump.
Shortage of coolant.
Clogged filter
Clogged pipe
Aging of O-ring in joint
The screw is too tight
14
Remedy
(customer procurement) and wiring.
Replace with a new fuse.
1. Press the red button of the Overload
protection switch and check the power
voltage and correct.
2. If no:
Manually rotate the pump and check the
motor rotation . ※2
3. If no:
Clean all pipes including pump and torch
thoroughly, and replace the coolant.please
use special glycol coolant (freezing point is
10 ℃ lower than the service environm ent).
4. If no:
Replace the mechanical seal or bearing (or
pump).
Use special glycol coolant (freezing point is
10 ℃ lower than the environment)
Correct input voltage
Do the remedy 3) if not, then 4) of the
"Overload protection switch trip".
Replenish coolant.
Clean the filter
Clean all pipes including torch thoroughly,
and replace the coolant with a new one.
Replace O-ring
The screw can be pushed to the internal
joint, but not too tight
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