English
Installation and operating instructions Wilo VR System
27
8.2 Fault matrix
Fault
Pum
ps do not
start
Pum
ps do not
stop
No
p
u
mp
cy
cling
Switching
fr
equency too high
Pum
ps running unsteadily
Motor
or pu
mp get too warm
Ele
ctrical mo
to
r protec
tion
triggers
P
u
mps
do not
pe
rform
Dry-running protection system switches off, althou
gh
w
a
te
r is
pres
ent
Dry-running protection do
es not
switch off, despite lack of
wa
te
r
Severely f
luctuating
final p
ressure
Ru
n signal light does
not light up
Cause
Low water protection system did not react
•
•
External Off
•
Intake pressure above pressure setpoint
•
Controller fuse faulty
•
•
Motor protection switch for the pumps has triggered
•
No mains voltage
•
•
Main switch “OFF”
•
•
Operating mode of the pumps “OFF”
•
Non-return valve leaking
•
Operating mode of the pumps “Manual”
•
•
•
Pressure setpoint set too high
•
•
Gate valve to pressure transducer closed
•
Gate valve in the system closed
•
•
•
Insufficient bleeding of the pumps
•
•
•
•
Error message pumps/frequency converter faulty
•
•
•
Intake pressure fluctuates severely
•
•
•
Diaphragm vessel closed or filled incorrectly
•
•
Volume flow too high
•
•
•
Suction-side pressure switch faulty or connected incorrectly
•
•
•
Check controller parameters
•
Check dry-running protection follow-up time T1
•
Check zero-flow follow-up time T2
•
8.3
Error memory for faults
The last 9 faults that occurred and the current
fault are displayed in the form of fault numbers
(code numbers) in the Error memory menu (see
Menu structure).
The error memory is designed in such a way that
the oldest fault (fault F9) is lost when a new fault
applies and is saved.
If F0 is displayed in the first menu item, a fault cur-
rently applies, which is characterised by its fault
number.
Code no.
Cause
Remedy
E00
Low water/dry running
Check intake pressure/water level of break tank
E40
Sensor faulty
Replace sensor
E42
Sensor cable faulty
Replace/repair sensor cable
E60
Overpressure
Consult Wilo Service
E70
Software stack low
Consult Wilo Service
E73
Internal electronic supply voltage too low
Check mains connection, consult Wilo Service
E75
Hardware analogue output faulty
Consult Wilo Service
E81...84
Pump malfunction, pumps 1...4
Observe EBA of the pumps
E90
Impermissible combinatorics
Check DIP switches 1...3
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