Causes And Remedies - Wilo Atmos TERA-SCH Serie Einbau- Und Betriebsanleitung

10.2

Causes and remedies

Installation and operating instructions Wilo-Atmos TERA-SCH
Faults, causes and remedies
Error type
3
4
5
6
7
8
Table 20: Error types
Error type:
1 2 3 4 5 6 7
X
X
X
X
X
X X
X
X
X
X
X
X
X
X
X
X
X X
X
X X X X
X X
X X X
Description
Pump end pressure too high
Bearing temperature too high
Pump housing leakage
Shaft seal leakage
Pump does not run smoothly or is loud
Pump temperature too high
8 Cause
Counter pressure too
high
X Pump and/or piping not
completely filled
X Inlet pressure too low or
negative suction head
too high
Sealing gap too large
due to wear
Incorrect direction of
rotation
Pump sucks air or the
suction line is leaky
Supply line or impeller
clogged
Pump blocked by loose
or jammed parts
Air pockets in the piping – Change the pipe lay-
Speed too low
– with frequency con-
verter operation
– without frequency
converter operation
Motor running on
2 phases
Counter pressure of the
pump too low
The viscosity or density
of the fluid is higher
than the design value
X The pump is strained
Speed too high
Pump unit poorly
aligned
en
Remedy
– Check system for
contaminants
– Reset the duty point
– Vent pump and fill
suction line
– Correct the fluid level
– Minimise resistances
in the suction line
– Clean filter
– Reduce negative suc-
tion head by installing
the pump lower
– Exchange worn wear
ring
– Change the motor
connection phases
– Replace gasket
– Check suction line
– Remove clog
– Clean pump
out or install an air vent
valve
– Increase frequency in
the permissible range
– Check voltage
– Check phases and
fuses
– Readjust the duty
point or adjust the im-
peller
– Check the pump di-
mensioning (consult
with the manufacturer)
Correct the pump in-
stallation
Lower speed
– Correct alignment
43