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5.4. Technical Data
Wilo PARA 25/8 iPWM1
Electric Data
Power supply
230 V, 50 Hz
Power input (min./max.)
2 / 75 W
Current (min./max.)
0.03 / 0.66 A
Max. speed
4800 rpm
Speed control
frequency converter
Energy Efficiency Index
≤ 0,21 by EN 16 297/3
IP rating
IPX4D
Motor protection
integrated
Operating Parameters
Fluid working temperature
0 - 95 °C
Max. static pressure
10 bar
Max. head
8.4 m
5.5. FAULTS AND THEIR REASONS
The LED light signals a defect. The pump will switch off (depending on the defect type) and
try to restart.
LED signals
State description and possible fault reasons
GREEN IS LIT
1 - pump is running in trouble-free operation
RED IS LIT
1 - rotor is blocked
2 - electric motor winding defect
FLASHING RED
1 - power supply lower/higher than 230 V
2 - electric short circuit in pump
3 - pump overheated
FLASHING RED AND GREEN
1 - unforced fluid circulation through the pump
2 - pump speed lower than desired
3 - air in pump
FAULTS
REASONS
TROUBLESHOOTING
The pump is not running despite
the power supply turned on
Faulty electrical fuse
Check the fuses
The pump is not energized
Remove the power interruption
The pump makes noises
Cavitation due to insufficient
inlet pressure
Increase the pressure within the
permitted range
Check the head adjustment, or
set a lower head
The building is not warming up
Heat output of heating
surfaces too low
Increase the desired value
Set the control method to Δp-c
If the fault cannot be rectified, contact a qualified technician.
