Faults, Causes And Remedies; Fault Signals - Wilo Para Série Notice De Montage Et De Mise En Service

Faults
Pump is not
running
although the
power supply is
switched on
Noisy pump
Building does
not warm up
10.1
LED Faults
Blocking
Lights
Contacting/
up red
winding
Under/overvoltage
Flashes Excessive
red module
temperature
Short-circuit
48

10 Faults, causes and remedies

The troubleshooting must only be carried out by a qual-
ified specialist, and work on the electrical connection
must only be carried out by a qualified electrician.
Causes
Electrical fuse
defective
No voltage supply
at pump
Cavitation due to
insufficient suction
pressure
Thermal output of
the heating surfaces
is too low

Fault signals

• The fault signal LED indicates a fault.
• The pump switches off (depending on the fault) and
attempts a cyclical restart.
Remedy
Check fuses
Rectify 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
Change the control mode from Δp-c
to Δp-v
Causes
Rotor blocked
Winding defective
Power supply too
low/high on mains
side
Module interior too
warm
Motor current too
high
Remedy
Activate manual
restart or contact
customer service
Check mains
voltage and
operating
conditions, and
request customer
service
Wilo SE 02/2020