QF1200S; edition 2016-05; page 19 of 24
5. Operating troubles, causes and remedial action
(Troubleshooting)
No.
Operating troubles
Causes and remedial
action
Pump
does
not
start
Pump
does
not
prime
Delivery
is not
ob-
tained
or
reduced
Pressure
head is
not
obtained
Irreg-
ular
pump
delivery
Pump
oper-
ates
noisily
Pump
is
leaky
Motor
gets
too
warm
Display
show
Error
code
1
X
X
The screws of the pump-chamber
maybe not tightened enough. Fix it!
2
X
Check the direction of flow showed by
the arrow on the pump, in case of
wrong way, turn the pump head.
3
X
X
X
Check suction pipeline and TC- seals
for tightness.
4
X
X
X
X
Check suction head-increase suction
line cross section.
5
X
X
X
Check viscosity of liquid pumped.
6
X
X
Check pump speed. Control speed of
drive motor. Check voltage and
frequency and the fuse (6,3A T in the
control box)
7
X
X
X
Avoid air inclusions in the liquid to be
pumped.
8
X
X
Check pressure head-open valve in
discharge line completely, remove
obstruction in discharge line.
9
X
Pressure line completely or partly
clogged, diaphragm maybe broken,
change diaphragm!
10
X
The diameter of the pipes in suction or
pressure line are too small.
11
X
Check the coupling halves. They must
be fixed with 1,5 mm space (see 4.2.2.)
12
X
Check longitudinal play of coupling rod
pins. The spider might be worn.
13
X
X
X
Check whether foreign bodies in pump.
Disassemble pump, remove foreign
bodies, replace defective parts.
14 X
X
X
Pump stopped by the thermal circuit
breaker. Please allow the motor to cool
down – please reduce the power
consumption.
15 X
X
Bearings are worn or defective
Disassemble pump, replace the shaft –
bearing – cap unit (PSKITWLC123 or
PSKITWLC125).
16
X
The valves are dry (e.g. not in use for a
long time), deformed or worn. Change
valve or wet the pump.
17
X
The diaphragm is burst ( the discharge
pressure was too high) – replace it
PSKITQ12.
18
X
X
X
X
O–rings between valve plate and pump
housing are defective PSKITQ12.
19
X
Align coupling accurately
20
X
X
The clamping ring screw got loose –
fixe it! See chapter 4.1.2. (drawing 12)
21 X
X
Parameters of the control panel are
wrong – check basic settings.
22
X
Pump after SIP cooled down too fast –
slow cooling with room temperature
