Fault Finding Chart - Homa CH 407 Serie Original-Manuel D'instructions De Montage

10. Fault Finding Chart

Before maintenance or repair disconnect the pump from
the power supply to avoid accidental starting of the pump!
Fault Cause
• Supply failure;
Motor does not
start. Fuses blow or
short-circuit;
motor starter trips
earth-leakage
out immediately.
fault in cable or
Caution: Do not
motor winding
start again!
• Fuses blow due
to use of wrong
type of fuse.
• Impeller blocked
by impurities.
• Level switch out
of adjustment or
defective.
• Low setting of
Pump operates, but
motor starter trips
thermal relay in
out after a short
motor starter.
while.
• Increased current
consumption due
to large voltage
drop.
• Impeller blocked
by impurities.
Increased current
consumption in
all three phases.
• Impeller blocked
Pump operates at
below-standard
by impurities.
performance and
power consumption.
• Wrong direction
of rotation.
• Discharge valve
Pump operates, but
gives no liquid.
closed or
blocked.
• Non-return valve
blocked
• Air in pump.
• Level switch out
Pump cycling be-
tween start and
of adjustment or
stop.
defective.
Remedy
• Have the cable
and motor
checked and
repaired by a
qualified electri-
cian.
• Install fuses of
the correct type.
• Clean the impel-
ler.
• Check the level
switch.
• Set the relay in
accordance with
the specifica-
tions on the
pump label.
• Measure the
voltage between
two motor
phases. Toler-
ance: ±10%
(±5% for explo-
sion-proof
pumps).
• Clean the impel-
ler.
• Clean the impel-
ler.
• Check the direc-
tion of rotation
and possibly
interchange two
phases
• Check the dis-
charge valve and
open and/or
clean.
• Clean the non-
return valve.
• Vent the pump.
• Check the level
switch.
15
WEEE Notice
The Directive on Waste Electrical and Electronic Equip-
ment (WEEE), which entered into force as European law
on 13th February 2003, resulted in a major change in the
treatment of electrical equipment at end-of-life.
The purpose of this Directive is, as a first priority, the
prevention of WEEE, and in addition, to promote the re-
use, recycling and other forms of recovery of such wastes
so as to reduce disposal.
The WEEE logo on the product or on its box indicates that
this product must not be disposed of or dumped with your
other household waste. You are liable to dispose of all
your electronic or electrical waste equipment by relocating
over to the specified collection point for recycling of such
hazardous waste. Isolated collection and proper recovery
of your electronic and electrical waste equipment at the
time of disposal will allow us to help conserving natural
resources. Moreover, proper recycling of the electronic
and electrical waste equipment will ensure safety of hu-
man health and environment. For more information about
electronic and electrical waste equipment disposal, recov-
ery, and collection points, please contact your local city
centre, household waste disposal service, shop from
where you purchased the equipment, or manufacturer of
the equipment.