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Installation and operating instructions Wilo-Rexa MINI3
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4. Draining the oil: rotate the pump until the opening
points downwards.
5. Checking the oil: notify customer service if the oil con-
tains metal swarf!
6. Rotate the pump until the opening points upwards again.
7. Filling the oil: pour the oil in through the opening.
⇒ Comply with requirements concerning oil type and
quantity!
8. Clean the screw plug, replace the seal ring with a new
one and fully screw it in.
9.3
General overhaul
Have the customer service team check the pump after
1,500 operating hours. All components will be checked for
wear and damaged components will be replaced.
10
Faults, causes and remedies
Pump not starting or switches off after a short time
1. Interrupted power supply
⇒ Check the electrical connection of the pump.
⇒ Have a qualified electrician check fuses/residual-
current devices.
2. Thermal motor monitoring has been tripped
⇒ Allow the pump to cool down. The pump will start
automatically.
⇒ Pump switches on/off too frequently. Check the
switching cycle of the float switch.
⇒ Excessive fluid temperature. Check the temperature.
If necessary, use a different pump.
3. Suction port/strainer/impeller silted/clogged
⇒ Shut down the pump, remove it and clean it.
4. Float switch not operational
⇒ The float switch must be able to move freely.
Pump starts up, but does not supply fluid
1. Pressure pipe/discharge pipe clogged
⇒ Flush out the pressure pipe.
⇒ Flush out the pressure hose.
⇒ Remove any kinks in the pressure hose.
2. Swing check valve contaminated
⇒ Shut down the pump, remove it and clean the dis-
charge connection.
⇒ Replace faulty swing check valve.
3. Water level too low
⇒ Check inlet.
⇒ Pump is pumping at a too low level. Check the
switching cycle of the float switch.
