Indicator Troubleshooting

 • 10 min read

Introduction to Troubleshooting Indicators

Troubleshooting indicators in weighing systems is a crucial skill for ensuring the accuracy and reliability of measurements. Whether facing issues with display errors, signal inconsistencies, or power disruptions, understanding how to diagnose and resolve these problems can significantly minimize downtime and maintain operational efficiency. This guide provides step-by-step instructions for identifying common issues with weighing system indicators, tailored for technicians, maintenance personnel, and end-users seeking practical solutions.


Servicing or troubleshooting indicators in weighing systems requires a high level of caution, particularly due to their integration with electrical components and often complex control systems. Indicators not only operate at low voltages but also serve as critical interfaces for broader system controls, where improper handling can lead to significant safety risks, including electrical shock, system malfunctions, and personal injury.

ONLY QUALIFIED PERSONNEL with a thorough understanding of electrical systems and safety protocols should engage in the maintenance or troubleshooting of operational indicator systems.

If the weighing system is legal-for-trade or otherwise sealed by tamper stickers or wire seals, breaching these seals could necessitate re-certification by an accredited professional. DO NOT tamper with any sealed systems. The sealing should contain contact information for a service provider, or the certification body that has a record of this information.

1. Getting Started with Troubleshooting Indicators

Before initiating any service work, it is essential to disconnect the power supply to the indicator and ensure the entire system is safely isolated to prevent accidental activation. Use of insulated tools and appropriate protective gear is mandatory to avoid unintended contact with live electrical components. Adherence to the safety guidelines specified by the indicator manufacturer, the specific on-site safety procedures, along with standard electrical safety practices, is non-negotiable.

Do NOT attempt to perform in-depth troubleshooting unless appropriately qualified and authorized. ANYLOAD can help to connect users of any types of indicator with a local scale service provider who can provide on-site support.

2. Basics of Troubleshooting Weighing Indicators

Diagnosing the root cause of issues in a weighing system requires a systematic approach to determine whether the problem lies with the scale structure, the instrumentation, or the load cells themselves.

The following is basic guide to help narrow down the issue to a specific component of a weighing system:

  1. Initial Assessment:
    • Display Check: Look for any irregularities on the display, such as flickering, incomplete digits, or unresponsiveness, which may indicate an instrumentation issue.
      Note any moisture condensation on the inside of the screen.
    • Power Supply: Confirm that the instrumentation is receiving a stable power supply and check for any loose or damaged connections.
    • Keypad Check: Ensure that the instrumentation touch interface is fully functioning and that any inputs to its keypad, buttons, and other switches properly register into the system.
    • Peripherals Check: If the indicator is connected to peripheral devices such as printers, remote displays, or data logging systems, temporarily disconnect these to determine if they are the source of the issue.
  2. Review Documentation:
    • Maintenance Records: Review the system’s maintenance logs and calibration records. Previous entries can highlight recurring issues or maintenance patterns.
    • Error Codes: Most indicators typically have a list of error codes that indicate the likely cause of the issue, at least as detected by the indicator. Locate the corresponding error code which should help to narrow down the issue.
    • Troubleshooting Section: Most advanced indicator manuals typically provide a troubleshooting section for common problems. Follow these guidelines closely for a methodical approach.
  3. Consult a Professional:
    • Contact Service Provider: The initial point of contact should be the original vendor or a local scale service provider. These experts are equipped to offer comprehensive support, addressing complex issues that might be beyond basic troubleshooting.
    • Contact the Manufacturer: While reaching out to the manufacturer can provide valuable insights, they often recommend that end-users seek assistance through their network of authorized dealers and service providers. This ensures specialized support tailored to the specific system and issue.

By systematically examining each component of the weighing system, you can help to isolate the source of the problem. If the problem is not readily apparent or if the system requires recalibration or repair, consulting with a professional is highly recommended. Our global network of dealers is equipped to provide expert assistance, from troubleshooting and repairs to calibration and certification, ensuring your weighing system operates accurately and reliably.

3. Instrumentation Tests & FAQ:

Power Supply Test:


There are multiple connection points that can become compromised or damaged, which is a frequent source of weighing system failures. Checking the power at each connection point can help pinpoint the issue. If the instrument is showing an ‘ADC error’ or otherwise indicating an inability to derive any signal output from the load cell or junction box, perform this test.


  1. Measure the excitation voltage at the instrument to ensure 5-15VDC
  2. Measure the excitation voltage at the junction box (summing card) to ensure 5-15VDC.
  3. Measure the excitation voltage on each load cell to ensure 5-15VDC.

Result: If any of these checks fail, power is not reaching the load cell. Check connections points and cable integrity.

If the readings on the indicator are unstable, consider checking all wiring connections and ensure that they are all properly tightened to avoid any loose connections. Check the weighing system to ensure that there are no mechanical obstructions or influences to the load. Check the indicator parameter settings, such as any digital filtering that may have been enabled.

If the readings on the indicator are not responsive to changes to the load applied, check that all the load cell and junction boxes are wired correctly according to the manufacturer’s colour code. Also check the wiring to ensure that there are no loose connections.

If the readings on the indicator are the reverse of what they should be proportional to the load applied, check that the load cell and junction box wiring wired according to load cell’s wiring colour code. Check that the (+) and (−) wires and/or the EXC and SIG wires are installed correctly.

Request Professional Assistance

While the basic steps outlined above can help identify common issues with weighing systems, some problems may require the expertise and equipment of a professional scale service company. Attempting to resolve complex issues without the necessary qualifications can lead to extended downtime, additional complications, and unnecessary risk to equipment and safety.

Professionals in scale service possess the expertise, tools, and experience to diagnose and resolve issues efficiently. They can provide comprehensive services, from calibration and maintenance to repairs and parts replacement.

We understand the urgency of resolving scale issues promptly to avoid operational disruptions. That is why we offer a global network of qualified service providers through our “Find A Dealer” page. No matter where you are in the world, our platform can connect you with a qualified professional ready to assist with your weighing system needs.

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