GAC 2700 Support Center

What it means: Error 999 is not a specific fault — it is a catch-all alert that tells you something went wrong during a measurement cycle. The GAC 2700 cannot identify the exact cause on its own. The real error is recorded separately in the instrument’s Audit Trail and must be looked up to determine next steps. The unit is not necessarily broken — in many cases the cause is environmental or operator-correctable.

• RF interference from nearby electronic devices
• Load cell (internal scale) malfunction
• Moisture result failed an internal validation check
• Grain sample issue — contaminated grain, incorrect product selected, or sample outside the calibration range
• Intermittent software or firmware anomaly

1. Press Start/Initiate to dismiss the error. Before proceeding, note the approximate time the error occurred.
2. From the Home screen, navigate to Audit Trail.
3. Press Advanced Filter and select Error Messages to show only error events.
4. Locate the error code logged at or just before the time of the Error 999 alert.
5. Press the record to expand it and view the full error code and description.
6. Use the error code displayed to look up the specific cause and corrective steps.

• Error 22 — RF Interference: move nearby electronics away from the unit and re-run the sample
• Error 50 — Weight Measurement Device Error: confirm the grain drawer is fully seated and the unit is level
• Error 63 — Realtime Moisture Measurement Error: dump the sample, clean the cell, and re-run
• Error 69 — Moisture Result Checksum Failed: dump the sample and re-run

Unit with shipping brackets installed

Removing a shipping bracket

Step-by-step directions with photos for shipping bracket installation and removal are included in the operator manuals and quick start guides for each model:

• After every testing session: empty grain drawer, brush out cell chamber.
• Weekly (or more in high-dust environments): wipe hopper, sensors, housing.
• Monthly: thorough inspection and deep clean per operator’s manual.

• LCD display: commercial glass lens cleaner on a soft cloth. Never spray directly on screen. No solvents, acids, or alkalis.
• Exterior housing: cleaner rated for plastic and stainless steel. Wipe dry.
• Grain hopper and upper sensors: dry cloth wipe; remove grain debris.
• Grain drawer and lower chamber: empty completely after every use; brush out residual kernels.
• Load cell area: use low-pressure compressed air or the included brush. Do NOT use water or wet cloths near the load cell.
• Temperature sensor: gently swab with 99% isopropyl alcohol and allow to dry completely before use.

The GAC 2700 menu includes a cleaning sequence option that opens the grain drawer to allow access and clean out the grain cell. To access it, navigate to the cleaning option in the instrument menu.

• Never use abrasive pads, steel wool, or harsh chemicals
• Never spray liquids directly into the grain chamber or sensor area
• Never run the unit with grain residue from a previous sample type still present — cross-contamination affects readings

Daily Clean Method — Reference Guide

The GAC 2700-UGMA supports loading calibrations as a bundle — a single file package containing all official USDA-certified calibrations for the unit. This is the recommended method for keeping UGMA calibrations current.

1. Download the current calibration ZIP file from dickey-john.com/calibrations.

Individual calibration files can be loaded onto the GAC 2700-UGMA, GAC 2700-AGRI, and GAC 2700-INTL. This is the required method for the GAC 2700-AGRI unit. Calibrations are obtained from DICKEY-john directly or through your authorized distributor.

DICKEY-john offers custom calibration services tailored to your specific requirements and process. The typical timeframe to receive a custom calibration is 3–6 weeks after all necessary samples and data have been received. Please note that custom calibrations cannot be created for all grains, products, or locations — our team will provide an explanation of available options for your specific application upon completion of the form.

1. Connect a printer to the GAC 2700. For best compatibility, use an RS232/serial printer connection if available. Or connect a USB printer to the USB port on the rear of the unit.
2. Power on the printer before powering on the GAC 2700, so the unit detects it at startup.
3. Access Setup from the main menu and confirm Printer is set to Enabled.
4. Run a test sample and press the Print button to verify output.

• The unit must be on a flat, hard, level surface with less than 1 degree of tilt for accurate weighing. Readings are significantly affected on tailgates, soft surfaces, or tilted shelves.
• Avoid vibration sources — tractors, fans, and grain augers running nearby can disrupt the load cell tare and trigger Error 2.
• Recommended: use a small bubble level to verify the surface before each testing session.
• Avoid testing in direct sunlight or extreme heat, which affects temperature compensation.

• Always power off completely and empty the grain drawer before moving.
• Reinstall shipping brackets before any transport — even short moves across a farm. The load cell is sensitive; vibration without brackets can push it out of calibration.
• Do not lay the unit on its side or stack items on top during transport.
• Use original packaging when shipping; ensure the unit is well-cushioned.

The GAC 2700 UGMA is DICKEY-john’s commercial tester — a legal-for-trade unit found in elevators and grain handling facilities. The GAC 2700 AGRI is designed for producers looking to improve testing accuracy on the farm.

GAC™ 2700-UGMA vs GAC™ 2700-AGRI — Full Comparison

• Ensure the grain sample is at or near ambient temperature. Let the sample equilibrate for 10–15 minutes if possible before testing.
• If the sample is cold, do NOT place it in a microwave to warm it up — this drives off moisture and gives a skewed result.
• The sample should be free of foreign material — dirt, chaff, broken kernels, and weed seeds all affect readings.
• Do not overfill the hopper; try to be consistent in the amount you load into the hopper.
• Avoid testing in direct sunlight or extreme heat, which affects temperature compensation.
• Run two tests and compare. If they differ by more than 0.5%, check for grain or debris remaining in the cell.

DICKEY-john® warrants to the original purchaser for use that, if any part of the product proves to be defective in material or workmanship within one year from date of original installation, and is returned to DICKEY-john within 30 days after such defect is discovered, DICKEY-john will (at our option) either replace or repair said part.

This warranty does not apply to damage resulting from misuse, neglect, accident, or improper installation or maintenance; any expenses or liability for repairs made by outside parties without DICKEY-john’s written consent; damage to any associated equipment; or lost profits or special damages. Said part will not be considered defective if it substantially fulfills the performance expectations.

THE FOREGOING WARRANTY IS EXCLUSIVE AND IN LIEU OF ALL OTHER WARRANTIES OF MERCHANTABILITY, FITNESS FOR PURPOSE, AND OF ANY OTHER TYPE, WHETHER EXPRESS OR IMPLIED. DICKEY-john neither assumes nor authorizes anyone to assume for it any other obligation or liability in connection with said part and will not be liable for consequential damages. Purchaser accepts these terms and warranty limitations unless the product is returned within fifteen days for full refund of purchase price.

All warranty service is handled through the dealer or Authorized Service Center (ASC) where the product was purchased, or through DICKEY-john directly.

1. Contact the dealer or Authorized Service Center where the product was purchased. They can help confirm next steps and determine whether the instrument should be submitted for warranty review.
2. If directed to submit directly, complete the repair form. Select Warranty Claim Assessment and provide the part number, serial number, date of purchase or installation, and a clear description of the issue and any troubleshooting already completed.
3. Warranty claims are evaluated by DICKEY-john. If the issue is determined to be covered under warranty, DICKEY-john will repair or replace the affected part at its discretion.