© Hendor - Quality Pumps & Filters
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Info 2016715/R0
6. Trouble shooting
In case of problems please read the manual and particularly this page. If the problem still exists or parts should be replaced, contact us and
always quote serial number, pump type, running conditions and/or defect of the pump. In case of returning a pump or filter for repair always
send the “Security Certificate” with the shipment.
Pump problem
Possible reason - horizontal pump
Possible reason - vertical pump
No liquid flow
2-3-4-5-6-7-8-12-15-22-24-31
4-5-7-8-12-15-17-22-24-28-31
Insufficient liquid flow
1-3-6-8-10-11-13-14-15-16-18-19-20-25-28-29
8-10-13-14-15-16-18-19-20-25-28-29-30
Insufficient pressure
8-10-13-14-15-16-18-20-25-29-30
10-13-14-16-18-30-25-29-30
Rising liquid temperature
8-15-19-25
8-15-18-19
Noisy pump or excessive vibration
1-3-6-13-14-15-20-21-22-23-28-34
9-13-14-15-16-17-21-22-23-32
Motor is overheating
13-15-16-20-21-22-23-24-25-27-28-29-30
15-16-21-22-23-24-25-27
Motor overload activated
20-25-26-28-29-30
22-25-26-29-30
Cracking/deformation
9-34-49
9-34-49
Corrosion
27-50
27-50
Filter problem
Possible reason
No or insufficient liquid flow
8-19-28-38-39-41-42-48
Leakage
39-40-49
Pressure gauge reading not correct
35-36-37-38
High dial indication on pressure gauge
8-42-48
Bad filtering result
33-42-43-45-47
Foam formation in the bath
11-31-46
System / Pipework
Liquid
1 Suction pipe too long or diameter too small
28 Liquid has crystallised
2 Air pocket in suction pipe
29 Specific gravity of liquid too high
3 Leak in suction pipe
30 Viscosity of liquid too high
4 Suction pipe or strainer blocked
31 Air / gas in liquid
5 Suction height too high
32 Abrasive particles in liquid
6 Air supply close to suction inlet
33 Colloïdal liquid
7 Foot valve or suction pipe insufficiently submerged
34 Liquid temperature too high
8 Valve in pipework (partly) closed
9 Discharge pipe under tension
10 Leak in discharge pipe
Filter
11 Return pipe not submerged (air intake)
35 Not enough anti-freeze in chamber below pressure gauge
12 Liquid level in tank too low
36 Membrane in chamber below pressure gauge deformed/damaged
37 Pressure gauge defect
Pump
38 Filter chamber insufficiently bled
13 Impeller damaged or worn out by abrasives
39 Filter chamber not closed properly
14 Impeller out of balance
40 Filter chamber gasket damaged of deformed
15 Impeller / volute blocked by foreign matter
41 Filter element incorrectly installed
16 Wrong impeller choice (50 or 60 Hz)
42 Filter system element saturated
17 Volute not immerged sufficiently in the liquid
43 Bypass of unfiltrated liquid
18 Wrong choice of pump size
44 Filter medium is too coarse
19 Pump is running at very low flow
45 Filter material damaged or torn
46 Unwashed cartridges used (residues of wetting agents)
47 Wrong choice of filter medium
Motor
48 Wrong choice of micron rating
20 Wrong direction of rotation
21 Cooling fan blocked or loose
22 Motor bearings jammed or worn out
Material / Environment
23 Motor bearings incorrectly installed
49 Wrong choice of pump / o-ring material
24 Motor down on a phase
50 Aggressive environment
25 Incorrect voltage
26 Thermal overload setting incorrect
27 Insufficient cleaning
