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Installation and operating instructions Wilo VR System 27
8.2 Fault matrix
Fault
Pumps do not start
Pumps do not stop
No pump cycling
Switching frequency too high
Pumps running unsteadily
Motor or pump get too warm
Electrical motor protection triggers
Pumps do not perform
Dry-running protection system switches off, althou
gh
water is present
Dry-running protection does not switch off, despite lack of
wa
ter
Severely fluctuating final pressure
Run 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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