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11. Fault Finding
Make sure electricity supply has been switched off before attempting to diagnose any fault
Fault
11.1 Motor does not start
11.2. Motor cut out during operation.
11.3. Pumped capacity is not
constant.
11.4. Pump runs but gives no liquid.
Cause
a. No electricity supply
b. Fuses are blown.
c. Motor overheating relay tripped.
d. Defective magnetic contactors.
e. Control circuit malfunction.
a. Fuses blown or breakers tripped.
b. Overheating relay tripped.
c. Control circuit malfunction.
d. Pump locked up by foreign objects.
a. Pump impeller blocked by impurities.
b. Insufficient liquid level in the tank.
(See Sec. 4.1)
a. Suction filter blocked by impurities.
b. Liquid level is too low (See Sec. 4.1)
c. Incorrect rotating direction.
~ 7 ~
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