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7.8. INSTALLATION / START UP TROUBLESHOOTING:
Only authorized service personnel who are trained professionals shall troubleshoot and repair pumps that are
experiencing operational or performance difficulties.
All HOMA pumps are factory tested, yet startup difficulties can occur with any mechanical equipment.
Please note that our technical support staff stands ready to assist you with any problem or difficulty you
might encounter with our equipment.
The following is a tabulation of common start-up problems and possible causes.
Symptom:
Possible Causes
Pump will not start:
1, 2, 3, 4, 27, 28, 29, 31, 32
Little or zero discharge:
5, 6, 7, 8, 16, 30, 32
Insufficient discharge flow/pressure:
5, 6, 9, 10, 11, 12, 26, 30
Excessive power consumption:
6, 9, 13, 28, 30
Excessive current draw:
6, 13, 14, 15, 19, 26, 30
Excessive pump vibration/noise:
12, 15, 16, 25, 26, 28, 31
Pumps runs & motor protection trips:
17, 18, 19, 20, 21, 28
Pumps run manually, but not automatically:
22, 23, 24
Pump runs hot:
7, 19, 25, 26, 28
Listing of Possible Causes:
28.
Incorrect or no power supplied to motor.
29.
Power cable cut.
30.
Short to ground in cable or motor winding.
31.
Control panel circuit breaker open.
32.
Actual system head is higher than calculated or specified.
33.
Incorrect impeller rotation direction.
34.
Sump liquid level is below pump's minimum submergence requirement.
35.
Closed discharge valve or jammed check valve.
36.
Wear ring(s) worn. (If Applicable).
37.
Vortex at pump's suction.
38.
Discharge valve partially closed.
39.
Insufficient NPSHA (Dry Pit Application).
40.
Actual system head is lower than specified resulting in over pumping condition.
41.
Voltage supply to motor is lower than required by motor.
42.
Damaged bearings.
43.
High system head causing pump to operate at extremely reduced capacity.
44.
Object stuck inside impeller.
45.
Motor not receiving proper voltage on all three phases.
46.
Phase/currents unbalanced or too high.
47.
Insulation between phases and earth ground, <1M-ohm.
48.
Density of the pumping media too high.
49.
Defective level sensor.
50.
Hand/Off/Auto switch not in Auto Position.
51.
Defective H/O/A switch, relay or contactor coil.
52.
Air Captured in Cooling Jacket.
53.
Pump not properly seated on Auto Coupling.
54.
Water intrusion through junction box.
28. VFD or Soft Start not functioning properly.
29. Run capacitor size to large (1ph).
30. Start capacitor size to small (1ph).
31. Profile seal not sealing or missing.
32. Start relay or capacitor damaged (1ph).
Please note that some possible causes may not relate to your particular model.