DAB KC, Instruction For Installation And Maintenance

Page: 23 / 64

ENGLISH
21
Error conditions
FAULTS
CHECKS
(possible causes)
REMEDIES
4. Unstable pump performance. A. Pressure at pump intake too
low.
B. Suction pipe partly clogged by
impurities.
C. Leak in the suction pipe.
D. Air in the suction pipe or in the
pump.
A. Check the pump suction
conditions.
B. Remove and clean the suction
pipe.
C. Remove and repair the suction
pipe.
D. Vent the suction pipe or the
pump. Check the pump suction
conditions.
5. The pump is working but not
supplying water.
A. Pressure at pump intake too
low.
B. Suction pipe partly blocked by
impurities.
C. Foot valve or non return valve
blocked in closed position.
D. Leaks in the suction pipe.
E. Air in the suction pipe or in the
pump.
A. See 4. A
B. See 4. B
C. Remove and clean, repair or
replace the valve.
D. See 4. C
E. See 4 D
6. The pump turns backwards
when power is turned off.
A. Leak in the suction pipe.
B. Faulty foot valve or non return
valve.
C. Foot valve completely or partly
blocked in open position.
A. See 4. C
B. See 5. C
C. See 5. C
7. Pump working with reduced
performance.
A. Wrong direction of rotation.
B. See 4. A, B, C, D
A. Only for three-phase pumps:
Switch off the electric power
supply with the external circuit
switch and exchange two phases
in the terminal board.
See also paragraph
7.2 “Checking the direction of
rotation”.