Troubleshooting; The Motor Does Not Start And Makes No Noise; The Motor Does Not Start But Makes Noise; The Motor Turns With Difficulty - Grundfos JP Serie Instrucciones De Instalación Y Funcionamiento

9. Troubleshooting

9.1 The motor does not start and makes no noise

Cause
Power supply failure
Remedy
• Check the electrical connections. If the fault is repeated immediately, this means the motor is short circuiting.
• Check that the motor is live. If the fault is repeated immediately, this means that the motor is short circuiting.
• Check the protection fuses or breakers. If required, change burnt fuses or switch on tripped breakers.
• Check that the pressure switch is live. Verify power at the switch terminals.
• Ensure that the tank pre-loading pressure is not higher than the minimum value of the pressure switch. Set the pre-loading pressure at
2 psi below the minimum value of the pressure switch.

9.2 The motor does not start but makes noise

Cause
Problem with electrical connections or blockage
Remedy
• Ensure that the power supply values are the same as the values on the nameplate. Correct any errors.
• Ensure that the connections have been made correctly. Correct any errors.
• Check the condition of the capacitor. Replace the capacitor.
• Look for possible blockages in the pump or motor. Remove the blockage.

9.3 The motor turns with difficulty

Cause
Insufficient voltage or blockage
Remedy
• Check the voltage which may be insufficient. Correct any errors.
• Check whether any moving parts are scraping against fixed parts. Eliminate the cause of the scraping.

9.4 The motor does not stop when the demand for water has ceased

Cause
Problem with the pressure switch
Remedy
• Ensure that the value at which the pressure switch is set to stop the motor does not exceed the pressure the pump can generate
(suction + delivery). Set the pressure switch at a lower pressure.
• Check that the pressure switch contacts move freely. If not, change the pressure switch.

9.5 The pump does not deliver water

Cause
Insufficient intake or priming failure
Remedy
• The pump has not been primed correctly. Repeat the priming procedure.
• The diameter of the intake pipe is insufficient. Replace the pipe with a larger diameter one.
• Blocked foot valve. Clean the foot valve.

9.6 The pump does not prime

Cause
Air pockets
Remedy
• The intake pipe or the foot valve is taking in air. Correct the problem and prime again.
• The downward slope of the intake pipe favors the formation of air pockets. Correct the inclination of the intake pipe.
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