Al-Ko HWA 4000 Comfort [21/220] Troubleshooting
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Al-Ko HWA 4000 Comfort [21/220] Troubleshooting

Al-Ko HWA 4000 Comfort [21/220] Troubleshooting
Troubleshooting
477 296_b 21
TROUBLESHOOTING
CAUTION!
Disconnect the mains plug before any fault rectification work. Faults in the electrical system
must be rectified by a qualified electrician.
Malfunction Cause Rectification
Pump drive motor does
not run.
No mains power. Check fuses and power supply.
CHECK
SUCTION SI
0.0 BAR
Pressure and through-flow
are deviating from normal
values, but pump is still run-
ning.
Message appears after 20 s. Pump at-
tempts to rectify fault itself for 90 s.
No action required.
If fault persists after 90 s, pump switches off
as dry-run protection.
Pump is switched off as dry-
run protection.
Fault on suction side.
Rectify fault and press SET. Pump then
starts up again. Attention: hot water when
restart occurs.
Leak on suction side. Check suction valve and suction hose.
Leak on filter bowl. Check filter bowl seal, retighten filter bowl.
Leak on filter chamber drain
screw.
Check drain screw seal, retighten drain
screw.
End of hose not in water,
water reservoir (e.g. cistern
or borehole) empty. Pump
drawing in air.
Suction line must always be at least 30 cm
under the surface of the water.
Filter heavily contaminated. Clean filter.
Suction line blockage Remove dirt from the suction area.
ALARM
SUCTION SI
0.0 BAR
Flow rate less than 300 l/h. Increase flow rate.
ALARM
CHECK PRE
1.5 BAR
Pump switches on and off
several times although no
water is being drawn off.
➯
Pump is switched off as
protection against over-
heating.
Fault on pressure side, e.g. leak.
Even small leaks on water taps and toilets
can cause the system pressure to drop.
Check the pressure line and draw-off points
for leaks.
Check and clean the check valve (18) in the
filter chamber.
Rectify the fault and confirm with SET -
pump then restarts.
Attention: hot water when restart occurs!
ADVICE
If the faults cannot be rectified, please contact our customer service department.

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