Fault Finding Chart - Homa Chromatic C 239 Serie Montage- Und Bedienungsanleitung

- Ball bearings: Check the shaft for noisy or heavy opera-
tion (turn the shaft by hand). Replace defective ball bear-
ings. A general overhaul of the pump is usally required in
case of defective ball bearings or poor motor function.
This work must be carried out by an authorized
service workshop.
- Cable entry: Make sure that the cable entry is watertight
and that the cables are not bent sharply and/or pinched.
Additionally at pump types with oil chamber:
- Oil level and oil condition in oil chamber:
Put the pump in horizontal position, so that the screw of
the oil chamber is above (at larger pumps: one of both
screws). Remove the screw and infer a small quantity of
oil. The oil becomes greyish white like milk if it contains
water. This may be the result of defective shaft seal.
In this case leave the condition of the shaft seals by a
HOMA Service to examine.
The oil should be replaced after 3000 operating hours.
Oil type: Shell Tellus C22, degradable HOMA-Atox (avail-
able on request). Used oil is to be disposed accordingly.
Servicing Contract
For a regular expert execution of all necessary mainte-
nance and inspection we recommend the conclusion of a
servicing contract by our HOMA Service. Please contact
our HOMA customer service.

10. Fault Finding Chart

Before maintenance or repair disconnect the pump
from the power supply to avoid accidental starting of the
pump!
Fault
Motor does not start.
Fuses blow or motor
starter trips out immedi-
ately. Caution: Do not
start again!
Pump operates, but
motor starter trips out
after a short while
Pump operates at be-
low-standard perform-
ance and power con-
sumption
Pump operates, but
gives no liquid
Pump starts and stops
running in short periods
11
Cause Remedy
• Supply failure; short- • Have the cable and
circuit; earth-leakage; motor motor
fault in cable or motor checked and re-
winding paired by a qualified
electrician
• Fuses blow due to use • Install fuses of the
of wrong type of fuse correct type
• Impeller blocked by • Clean the impeller
impurities
• Level switch is defect • Check the float
switch and replace
the float switch if
necessary
• Low setting of thermal • Set the relay in ac-
relay in motor starter cordance with the
specifications on the
pump label
• Increased current con- • Measure the voltage
sumption due to large between two motor
voltage drop phases. Tolerance:
± 10% (± 5% for ex-
plosion-proof
pumps)
• Impeller blocked by • Clean the impeller
impurities. Increased
current consumption in
all three phases
• Impeller blocked by • Clean the impeller
impurities
• Discharge valve • Check the discharge
closed or blocked valve and possibly
open and/or clean
• Non-return valve • Clean non-return
blocked valve
• Air in pump • Vent the pump
• Float switch is defect • Check the float
switch and replace
the float switch if
necessary