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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
LED
Meaning
lights
Pump in
green
operation
blinks
RKA model:
quick
green
lights
Pump is in
orange
PWM mode
blinks
Pump in func-
red/
tion but stopped
green
blinks
Pump out of
red
function
blinks
Pump out of
orange
function
LED off
No power supply No voltage on
If the fault cannot be remedied, please consult the specialist technician or
the Wilo factory after-sales service.
Installation and Operating Instructions Wilo-Yonos PARA RSTG
Diagnostic
Pump runs according
its setting
Pump runs during 10
min in air venting
function. Afterwards
the targeted per-
formance must be
adjusted.
Pump is speed con-
trolled by the PWM
signal
Pump restarts by
itself after the fault
is disappeared
Pump stopped
(blocked)
Pump stopped
electronics
Cause
Normal operation
Normal operation
Normal operation
1. Undervoltage
U<160 V
or
Overvoltage
U>253 V
2. Modul overheating:
temperatur inside
motor too high
Pump does not
restart by itself due to
a permanent failure
Pump is not starting
1. Pump is not con-
nected to power
supply
2. LED is damaged
3. Electronics are
damaged
Remedy
1. Check voltage supply
195 V < U < 253 V
2. Check water and
ambient temperature
Change pump
Change pump
1. Check cable
connection
2. Check if pump is
running
3. Cange pump
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