Installation and Operating Instructions Wilo-Yonos PARA 21
English
9 Maintenance
DANGER! Danger of death!
A fatal shock may occur when working on electrical equipment.
• The pump must be electrically isolated and secured against unauthorised
switch-on during any maintenance or repair work.
• Any damage to the connecting cable must always be rectified by a qualified
electrician only.
After successful maintenance and repair work, install and connect the pump
according to the “Installation and electrical connection” chapter. Switch on the
pump according to the “Commissioning” chapter.
10 Faults, Causes and Remedies
If the fault cannot be remedied, please consult the specialist technician or
the Wilo factory after-sales service.
LED Meaning Diagnostic Cause Remedy
lights
green
Pump in
operation
Pump runs according
its setting
Normal operation
blinks
quick
green
RKA model: Pump runs during 10
min in air venting
function. Afterwards
the targeted per-
formance must be
adjusted.
Normal operation
PWM model: Pump in standby Normal operation
blinks
red/
green
Pump in func-
tion but stopped
Pump restarts by
itself after the fault
is disappeared
1. Undervoltage
U<160 V
or
Overvoltage
U>
253 V
1. Check voltage supply
195 V < U < 253 V
2. Modul overheat-
ing: temperatur
inside motor too
high
2. Check water and
ambient temperature
blinks
red
Pump out of
function
Pump stopped
(blocked)
Pump does not
restart by itself due
to a permanent fail-
ure
Change pump
LED off No power supply No voltage on
electronics
1. Pump is not con-
nected to power
supply
1. Check cable
connection
2. LED is damaged 2. Check if pump is
running
3. Electronics are
damaged
3. Cange pump
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