en Faults, causes and remedies
44 WILO SE 2020-02
Faults Causes Remedies
The three-way valve is not work-
ing anymore
Blocked due to sediments on the valve seat visual check and, if necessary, dismantle and
clean the valve
Default indication on the control
panel
The float switch signal sent to the controller is
wrong because the cable is damaged or the float
switch is blocked inside the rainwater storage
tank
Check the contacts or perform a visual control
The system is running with city
main water whereas the rainwater
storage thank is full
The control panel is in manual mode Restore the correct functioning mode on the
control panel
Despite the sufficient water level in the tank, the
float switch did not change the supply mode.
The cable is damaged or the float switch is
blocked inside the tank
Check the contacts or perform a visual control
The system is automatically renewing the water
inside the break-tank (check chapter 7.1)
Nothing to do, it’s a programmed feature. Check
chapter 6.2.
The float valve in the break-tank
is not closing/water is draining
through the overflow
The float valve is defective or mechanically
blocked
Perform a visual check, and if needed remove the
break-tank in order to check the float valve
Controller error codes
Incidents Error codes Causes Self-acknow-
ledging
Following actions
Maximum pump cycles per
hour
E140 Frequent starts due to
leakage (counter of starts
in specific time)
Error will be generated.
Pressure sensor fault
E40.1 Short circuit or wire break
(signal value out of the
range 4-20mA)
Pump stops, error will be generated.
Dry running RWM
E62.1 No minimum pressure after
MP start/operation within a
specific time in RWM
x If within in specific time there is no min-
imum pressure. The pump keeps on run-
ning and it will be switched over to TWM
for an adjustable time and back again in
RWM. If pressure is increase above min-
imum pressure within an adjustable time
in RWM, system operates normally again.
If pressure could not increases, it will be
switch over to TWM and back again for a
maximum of 5 times per hour. During this
time the pressure value on main screen is
blinking. After 5 times pump stops, error
will be generated.
Dry running TWM
E62.2 No minimum pressure after
MP start/operation within a
specific time in TWM
x pump stops, error will be generated.
Self-priming failure
No water in suction side
(see dry running)
(see dry running).
Max. runtime pump
E141 Maximum permanent op-
eration time is reached,
leakage in system
Pump stops, error will be generated.
Break tank overflow
E66.0 Too much water in break
tank via overflow sensor
Forced TWM, error will be generated.
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