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Installation and operating instructions AF Basic 21
If the fault cannot be remedied, please contact
your nearest Wilo customer service point or rep-
resentative. Only Wilo customer services are
authorised to install/remove the devices during
the warranty period.
11 Spare parts
Spare parts may be ordered via local professional
technicians and/or the WILO customer service.
To avoid queries and order errors, please supply all
data on the name plate with every order
Subject to change without prior notice!
Faults Causes Remedy
Pump switches on and off too frequently
when water is drawn off
Minor leakage in the system. Close pressure pipe, determine the cause
of the fault, and remedy.
The non-return valve of the pressure and
flow controller no longer closes.
Clean the pressure- and flow controller,
replace if necessary.
Draw-off volume too low Extend switch cycle using suitable
measures:
• Increase the minimum volume flow
• Install a diaphragm pressure vessel on
the pressure side
The pump has a leak.
The mechanical shaft seal is faulty. Renew pump.
The float valve in the replenishment res-
ervoir does not close/the water flows
into the overflow.
The float valve has come undone or is
mechanically stuck.
Carry out a visual inspection.
Where necessary, adjust/secure the con-
nection to the public water supply.
Clean the tank and/or the float valve.
The switching valve is blocked.
The blockage is caused by deposits on
the valve seat.
Carry out a visual inspection.
Where necessary, uninstall and then
reinstall the drive.
An error appears on the RCB switchgear
or pressure and flow controller Ecocon-
trol.
The float switch did not switch to
replenishment when the minimum water
level in cistern was reached. Cable dam-
aged or the float switch trapped in the
cistern.
Carry out a visual inspection.
Remove a possible blockage of the float
switch and/or check proper functioning
of its contacts.
The red LED light on the RCB switchgear
lights up and the associated error mes-
sage appears.
The control button on the RCB switch-
gear is blocked.
Remove the cover from the RCB switch-
gear and realign the button properly.
We recommend you check the operating
mode afterwards.
Feed mode is active even though the cis-
tern is full.
The RCB switchgear is in manual mode. Press the control button on the RCB
switchgear.
Float switch has not switched to replen-
ishment in spite of minimum water level
in cistern. Cable damaged or the float
switch trapped in the cistern.
Carry out a visual inspection.
Remove any blockage of the float switch
and/or check proper functioning of its
contacts.
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