12
400W AUTOMATIC STAINLESS STEEL SUBMERSIBLE CLEAN WATER PUMP
TROUBLESHOOTING GUIDE
Problem:
The pump switches itself off 
because of overheating. 
(thermal motor switch)
Possible Causes:
The water level is too low.
Clogged by drawn-in particles Foreign matter jammed in 
the pump rotor.
The temperature of the pumped fluid 
is too high.
It may not exceed +35°C in 
continuous operation.
The pump runs, 
but takes in nothing.
Reduction in the quantity 
of water delivered.
The pump does not start or 
Stops suddenly during operation.
The float is not functioning.
The motor switch did not 
switch itself on.
The rotor is jammed.
The overheating protection switches 
off the pump because it is overheated.
No electrical power.
Dirt particles (for example, pebbles) 
have settled in the intake port.
Check the cord/plug/fuses. 
Please note: Send the pump to 
customer service.
The temperature of the fluid is too 
high, a maximum of +35°C.
The intake section is clogged. 
Clean.
Check the power source. Pull the 
power plug out of the electrical 
socket and clean the impeller.
Make sure that the permitted 
highest temperature limit of  
+35°C is not exceeded.
Check the fuse and electrical 
connections. Clean the intake 
port. Check the power source.
The discharge pipe is bent, kinked 
or its diameter is reduced.
The base / rotor is dirty.
Partially clogged./
Straighten the pipe. 
Increase the diameter.
Clean.
Pull the power plug out of 
the socket.
Remedy:
Submerge the pump more deeply.
Check and clean the pump.
Reduce the temperature of the 
fluid.
Wait for approx. 26 minutes for 
the motor to cool (motor switch).
The water level is below the 
minimum intake level.
Air bubbles can accumulate with the 
immersion of the pump or its 
automatic operation because of an 
inappropriate positioning of the float 
switch.
This occurs at the minimum water 
level when the pump does not stop, 
but instead takes in air.
Intake filter clogged.
Discharge pipe clogged.
Switch the pump off.
Let the air out by tilting the pump 
and again submerging it in water.
Remove impurities.
Clean the pipe.
Newly position and clean the pipe.