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Lowara Pump Blog

Call Us: +971 4 252 2966

Pump Not Starting: Troubleshooting Guide

6/19/2025

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Goulds Pump Supplier in UAE
When a pump fails to start, it can disrupt operations and lead to downtime. Identifying the cause quickly is key to restoring functionality and minimizing lost time. There are several potential reasons why a pump may not start, ranging from power issues to mechanical failures. Below is a step-by-step troubleshooting guide to help identify and resolve the issue.

1. Check the Power Supply
Possible Causes:
  • No Power to the Pump: The most common cause of a pump not starting is a lack of power.
  • Power Supply Interruptions: There may be interruptions or fluctuations in the electrical supply to the pump.
Troubleshooting Steps:
  1. Ensure Power is On: Verify that the pump’s electrical supply is turned on and functioning.
  2. Check the Circuit Breaker or Fuse: Inspect the circuit breaker or fuse for any tripping or blown fuses. If the fuse is blown or the breaker is tripped, reset it or replace the fuse.
  3. Confirm Voltage: Check the voltage at the pump's power terminals to ensure the correct voltage is being supplied. An incorrect voltage can prevent the motor from starting.
  4. Verify Disconnect Switch: Ensure that any disconnect switches or control panels are properly turned on.

2. Inspect the Motor for Issues
Possible Causes:
  • Motor Problems: If the motor is malfunctioning, the pump may not start.
Troubleshooting Steps:
  1. Check for Motor Overload: Some pumps are equipped with overload protection that prevents the motor from starting if it’s overloaded. If an overload condition has occurred, reset the overload protector or circuit breaker.
  2. Test the Motor Windings: Use a multimeter to check the motor windings for continuity. If the windings are open, the motor may need to be replaced.
  3. Examine the Motor for Overheating: Overheating can cause thermal protection to activate, preventing the motor from starting. Check if the motor feels excessively hot and, if so, let it cool down before attempting to restart.
  4. Inspect the Motor Starter: If the pump motor uses a starter, check for any malfunction or faulty components in the starter assembly, such as the contactor, overload relay, or control circuit.

3. Check the Pump’s Control System
Possible Causes:
  • Faulty Control Circuit: Issues with the pump's control system can prevent the pump from starting, such as faulty wiring, relays, or switches.
Troubleshooting Steps:
  1. Examine Control Switches: Ensure that all switches, relays, and control circuits are in the correct position to allow the pump to start.
  2. Test Control Circuit: Use a multimeter to check for continuity in the control circuit. If the circuit is open or damaged, you may need to replace the control components (e.g., relay, switch).
  3. Inspect Pressure Switches: For pumps that rely on pressure switches, ensure the pressure settings are correct and that the switch is functioning properly. If the pressure is too low or too high, it may prevent the pump from starting.

4. Verify Proper Pump Priming
Possible Causes:
  • Pump Not Primed: For centrifugal pumps, if the pump is not properly primed, it may fail to start or fail to operate efficiently once it starts.
Troubleshooting Steps:
  1. Check for Air in the System: Ensure the pump is properly primed and that there is no air trapped in the suction line or pump casing. Air can prevent the pump from creating the necessary suction to start.
  2. Re-prime the Pump: If the pump is not primed, follow the manufacturer's guidelines to prime the pump. Typically, this involves filling the pump casing with fluid and ensuring the suction line is free from air.
  3. Inspect the Foot Valve and Check Valve: Make sure the foot valve or check valve at the pump’s intake is not clogged or damaged, as this can prevent the pump from priming.

5. Inspect for Mechanical Failures
Possible Causes:
  • Blocked Impeller: A blocked or damaged impeller can prevent the pump from starting.
  • Shaft or Bearing Issues: If the pump’s shaft or bearings are damaged or seized, the motor may not be able to turn the pump.
Troubleshooting Steps:
  1. Check for Blockages: Inspect the impeller for debris, dirt, or any other blockages that may prevent it from turning. Clean or remove any obstructions.
  2. Examine Shaft and Bearings: Check if the pump shaft rotates freely. If there is resistance or a grinding noise, it may indicate a bearing issue. Lubricate or replace any worn bearings.
  3. Listen for Abnormal Sounds: If the pump starts but produces unusual sounds (e.g., grinding, squealing), it may indicate internal mechanical issues, such as a seized bearing or damaged impeller. In such cases, you may need to disassemble the pump for inspection and repair.

6. Check the Pump’s Voltage and Frequency
Possible Causes:
  • Incorrect Voltage or Frequency: If the pump motor is not receiving the correct voltage or frequency, it may fail to start.
Troubleshooting Steps:
  1. Verify Voltage: Ensure the voltage supplied to the pump motor matches the motor's specifications. Voltage mismatch can prevent the motor from starting or cause it to malfunction.
  2. Check Frequency Settings: For pumps using variable frequency drives (VFDs), ensure that the frequency settings are correct. Incorrect settings can prevent the motor from operating properly.

7. Test the Overload Protection System
​Possible Causes:
  • Overload Protection Tripped: Many pumps have built-in overload protection mechanisms that stop the motor from starting if it is at risk of damage due to overload.
Troubleshooting Steps:
  1. Reset the Overload Protection: If the motor has tripped the overload protection, reset it and allow the motor to cool down before attempting to restart. Overloads can happen if the system demands more power than the pump can handle.
  2. Check for System Overload Conditions: Determine if the pump is undersized for the application, or if there are any external factors (e.g., excessive system pressure, blocked lines) that are causing the motor to overload.

8. Inspect for Incorrect Installation or Wiring Issues
Possible Causes:
  • Improper Wiring or Installation: Incorrect installation, including faulty wiring, can prevent the pump from receiving power or cause it to fail to start.
Troubleshooting Steps:
  1. Verify Installation: Double-check the pump’s installation, ensuring that all connections, wiring, and electrical components are correctly installed according to the manufacturer’s instructions.
  2. Check Wiring Connections: Inspect the wiring for loose or damaged connections. Reconnect or repair any faulty wiring as needed.

9. Review Manufacturer Guidelines
If none of the above steps resolve the issue, it’s important to refer to the manufacturer’s manual or guidelines for troubleshooting. Goulds Pumps, like other manufacturers, often include specific instructions for common issues, as well as troubleshooting tips that are tailored to their specific models.

When a Goulds pump fails to start, a methodical approach to troubleshooting can help identify the underlying cause and restore functionality quickly. Common issues include power supply problems, motor malfunctions, improper priming, mechanical failures, and system overloads. By following the steps outlined in this guide, you can diagnose and address the problem efficiently, minimizing downtime and ensuring the pump operates at its optimal performance.
If troubleshooting steps don’t resolve the issue, consider consulting with a professional technician or the manufacturer’s support team to ensure proper repair and maintenance. For more info contact Goulds Pump Supplier in UAE or call us at +971 4 2522966.

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