Faults, Causes And Remedies; Warning Signals - Wilo Yonos PICO OEM Einbau- Und Betriebsanleitung

Faults
Pump is not
running
although the
power supply is
switched on
Pump making
noises
Building does
not get warm
10.1
LED Faults
E07 Generator
operation
E11 Dry run
E21 Overload
38

10 Faults, causes and remedies

The troubleshooting must only be performed by a
qualified specialist, work on the electrical connection
must only be performed by a qualified electrician.
Causes
Electrical fuse
defective
Pump has no
voltage
Cavitation due to
insufficient suction
pressure
Thermal output of
the heating
surfaces is too low

Warning signals

• The warning signal is indicated by the LED display.
• Fault signal LED does not light up.
• The pump continues to run with limited output.
• The indicated faulty operating status must not occur
for a prolonged period. The cause must be eliminated.
Causes
Water is flowing through
the pump hydraulics, but
pump has no mains
voltage
Air in the pump
Sluggish motor, pump is
operated outside of its
specifications (e.g. high
module temperature). The
speed is lower than during
normal operation.
Remedies
Check fuses
Resolve the power interruption
Increase the system pressure within
the permissible range
Check the delivery head and set it to
a lower head if necessary
Increase setpoint
Set control mode to Δp-c
Remedies
Check mains
voltage
Check volumetric
flow rate/water
pressure
Check the ambient
conditions
WILO SE 02/2018