TrueHb Error Codes & Troubleshooting Guide: Meter, Strip, Battery & Result Problems
Dr Pramod kumar
The TrueHb Hemometer is a portable quantitative hemoglobin testing system designed to work with compatible TrueHb Hemoglobin Test Strips.
If the meter does not proceed normally through a test, displays an error, fails to recognise a strip or produces unexpectedly inconsistent results, the problem should be investigated systematically before another patient result is accepted.
The standard TrueHb Hemometer user manual documents several specific error messages as well as troubleshooting procedures for power problems and widely varying Hb results.
This guide explains those verified TrueHb error codes and also covers common problems involving test-strip insertion, batch-code matching, inadequate blood samples, battery charging, operating temperature and ambient light.
Important: This Guide Is for the Standard TrueHb Hemometer
This article applies to the standard red-and-black TrueHb Hemometer that uses manual three-digit strip batch-code matching.
The newer TrueHb Nord is a different-generation meter. It uses RFID technology for strip batch detection and may use different prompts, error messages and troubleshooting procedures.
If you have TrueHb Nord, follow the instructions supplied specifically with that model.
TrueHb Error Codes at a Glance
| Error | What It Means | What to Do |
|---|---|---|
| Error 1 | Test strip inserted before the strip symbol appeared | Remove the strip and wait for the meter to display the strip symbol before inserting a fresh strip correctly. |
| Error 2 | Low/exhausted battery | Recharge the TrueHb meter before testing. |
| Error 3 | Meter temperature below the permitted operating range | Move the meter to a suitable environment and allow it to reach the operating range specified for your meter before testing. |
| Error 4 | Meter temperature above the permitted operating range | Move the meter away from excessive heat and allow it to return to a suitable operating temperature. |
| Error 5 | Ambient light is too intense or the meter is facing a strong light source | Move the TrueHb meter to a normally lit area away from direct or intense light and repeat the procedure. |
TrueHb Error 1: Strip Inserted Too Early
Error 1 means the TrueHb test strip was inserted before the meter displayed the test-strip symbol.
The standard TrueHb testing sequence matters.
The correct order is:
- Switch on the TrueHb meter.
- Allow the meter to complete its startup check.
- Check the displayed strip batch code.
- Correct and accept the batch code if required.
- Wait for the test-strip symbol.
- Insert the TrueHb strip.
If the strip is inserted prematurely, remove it and wait until the meter requests the strip.
Do not apply blood until the strip has been correctly accepted by the meter.
Why Does TrueHb Require This Sequence?
The standard TrueHb workflow is designed to ensure that meter startup and strip batch-code setup occur before testing.
If the steps are performed out of order, the system may not proceed correctly to sample measurement.
A useful rule is:
Power On → Check Batch Code → Wait for Strip Symbol → Insert Strip
TrueHb Error 2: Low or Exhausted Battery
Error 2 is associated with the low-battery indication and means that the rechargeable battery does not have sufficient charge for normal operation.
Recharge the TrueHb Hemometer using the appropriate charging equipment supplied or specified for the device.
Do not begin a patient test when the meter is indicating an exhausted battery.
TrueHb Meter Does Not Turn On
If the TrueHb meter does not switch on at all, the manual identifies several possible causes.
Check the Battery Charge
The battery may be completely discharged.
Recharge the meter and try again.
Check Battery Installation
For meter revisions with a removable rechargeable battery, check that the battery is installed correctly.
Check for Battery Absence or Poor Contact
If the battery has been removed or is not seated correctly, the meter may not power on.
Check the Display
If the meter appears to power internally but the screen remains blank or damaged, the display or meter may require technical attention.
TrueHb Does Not Charge After Long-Term Storage
The standard TrueHb manual provides a specific troubleshooting step when the meter has not been used for a long period and does not appear to charge normally.
For versions with a removable battery:
- Remove the battery.
- Wait approximately five minutes.
- Reinsert the battery correctly.
- Recharge the meter immediately.
If the meter still does not charge or power on, contact appropriate product support rather than attempting to open or repair the instrument yourself.
TrueHb Error 3: Temperature Too Low
Error 3 appears with a low-temperature indication when the meter is below its permitted operating temperature.
The standard manual version containing these error codes specifies an operating environment of approximately:
10°C to 45°C
If the meter is too cold:
- Move it into a suitable indoor environment.
- Allow the meter and strips to reach an appropriate temperature naturally.
- Do not attempt rapid heating using a heater, hair dryer or hot surface.
- Repeat the test only after the meter is within the operating conditions specified for your particular device.
Important: TrueHb has existed in different hardware and documentation revisions. If the operating range printed on your meter or current manual differs, follow the instructions supplied with your exact device.
TrueHb Error 4: Temperature Too High
Error 4 means the meter is being operated above the permitted temperature range.
Move the TrueHb Hemometer away from:
- Direct sunlight
- Hot vehicle interiors
- Windows exposed to strong sun
- Heaters
- Hot laboratory equipment
- Other high-temperature environments
Allow the meter to return naturally to a suitable operating temperature before testing again.
Do not cool the meter rapidly by placing it in a refrigerator or freezer.
TrueHb Error 5: Ambient Light Too High
Error 5 occurs when the ambient light intensity is too high or the meter is facing a strong light source.
The TrueHb system uses reflectance photometry, so the optical measuring system must operate under suitable conditions.
If Error 5 appears:
- Move away from direct sunlight.
- Avoid testing directly under an intense lamp.
- Do not aim the strip area toward a bright light source.
- Move to a normally lit indoor environment.
- Restart the testing process where appropriate.
Why Light Can Matter in TrueHb Testing
TrueHb measures the optical response generated by the reaction on the hemoglobin test strip.
Excessive external light around the optical system can interfere with normal measurement conditions, which is why the meter is designed to detect excessively bright environments.
TrueHb Strip Is Not Recognised
If the meter does not proceed normally after strip insertion, check the following:
- Are you using a genuine TrueHb test strip?
- Did you wait for the strip symbol before inserting it?
- Is the strip inserted in the correct direction?
- Is the strip inserted fully?
- Is the strip damaged?
- Has the strip already been used?
- Is the strip within its expiry date?
Do not force a strip into the meter.
For detailed strip identification, read:
TrueHb Test Strip Compatibility Guide
TrueHb Strip Is Inserted but the Test Does Not Proceed
The standard TrueHb workflow requires the correct sequence.
Check that you:
- Switched the meter on first.
- Verified the strip batch code.
- Accepted the correct batch code.
- Waited for the strip symbol.
- Inserted the strip fully and correctly.
If the workflow has been interrupted or performed out of order, restarting the procedure with a fresh strip may be necessary.
TrueHb Batch Code Does Not Match the Strip Bottle
The standard TrueHb Hemometer uses a manually selected three-digit strip batch code.
If the displayed code does not match the code printed on the current TrueHb strip vial:
- Do not proceed to blood application.
- Use the arrow controls to select the correct digits.
- Confirm the displayed code against the vial.
- Accept the correct code using the centre button.
- Wait for the strip symbol before inserting the test strip.
Whenever you change to another strip batch, recheck the code.
Why Batch-Code Errors Matter
The batch-code setup forms part of the standard TrueHb meter-and-strip workflow.
Using the wrong code may interfere with the intended strip-specific measurement procedure.
Do not simply leave the previous batch code in the meter because it worked with an earlier strip bottle.
Not Enough Blood on the TrueHb Strip
An inadequate sample is an important practical testing problem even though the legacy standard manual does not assign it one of the five numbered error codes above.
The TrueHb test area must receive an adequate blood sample.
The standard system generally requires approximately:
10–12 µL of whole blood
Ensure the designated reaction area becomes adequately covered according to the manufacturer's instructions.
If an inadequate sample has compromised the test:
- Do not attempt to reuse the same strip.
- Use a new sterile lancet if another finger prick is required.
- Use a fresh TrueHb test strip.
- Obtain an adequate blood drop before applying the specimen.
Do Not Add Blood to the Wrong Part of the Strip
Blood should be applied to the designated white test area of the compatible TrueHb strip.
Avoid:
- Applying blood to the electrical/contact end
- Smearing blood across the strip
- Applying blood to the meter body
- Touching the white test area unnecessarily before testing
Incorrect blood placement can prevent successful testing or produce an unsuitable test condition.
TrueHb Results Vary Widely Within a Short Time
The TrueHb manual specifically includes troubleshooting for wide variation between results obtained within a short period.
Several causes should be reviewed.
1. Dirty Meter or Optical Detector
A contaminated optical area can interfere with measurement.
Clean the meter according to the manufacturer's instructions using an appropriate damp cloth where specified.
Do not use unapproved cleaning chemicals or insert sharp objects into the optical area.
2. Incorrect Blood Sampling Technique
For capillary testing, avoid aggressive milking or squeezing of the finger.
Encourage normal blood flow and obtain an adequate sample.
3. Stored Blood Was Not Mixed Properly
When an appropriate stored venous whole-blood specimen is being used, the manual advises homogenising/mixing the sample appropriately before application.
Follow your laboratory procedure and the manufacturer's requirements.
4. Insufficient Blood
The manual advises making sure the test region is completely covered with enough blood—at least approximately 10 µL in that manual revision.
5. Damaged or Improperly Stored Strips
If strip quality is questionable, use a fresh strip from a correctly stored pack.
6. Meter or Hardware Damage
If correct sampling and fresh strips do not resolve the issue, the meter may require technical inspection or support.
TrueHb Gives an Unexpectedly Low Hb Result
An unexpectedly low result does not automatically mean the meter is defective.
Review:
- Correct TrueHb strip
- Correct batch code
- Strip expiry
- Strip storage
- Sample volume
- Blood placement
- Finger-prick technique
- Meter cleanliness
- Operating temperature
- Ambient light conditions
If a procedural problem is identified, repeat the test appropriately using a new strip.
If the low result persists or is clinically important, laboratory confirmation and appropriate professional medical evaluation may be required.
TrueHb Gives an Unexpectedly High Hb Result
Use the same structured review:
- Check the strip and batch code.
- Check sampling technique.
- Check strip storage and expiry.
- Check the optical area and meter condition.
- Check temperature and lighting.
- Repeat with a fresh strip when appropriate.
Do not continue repeatedly testing until a preferred result appears.
TrueHb Result Changes Significantly on Repeat Testing
When repeated measurements vary considerably, investigate the procedure rather than immediately assuming that one of the numbers is correct.
Possible causes include:
- Different blood-drop quality
- Excessive finger squeezing
- Insufficient blood
- Incorrect strip placement
- Wrong batch code
- Damaged strips
- Poor strip storage
- Dirty optical detector
- Meter damage
TrueHb Strip Was Removed Before the Test Finished
Do not deliberately remove the test strip while the meter is processing the sample.
The meter should be allowed to complete its measurement cycle according to the display prompts.
If the strip has been removed prematurely or the test sequence has been interrupted, do not reuse that strip.
Restart the test with a fresh strip where appropriate.
TrueHb Meter Times Out Before Testing
If the meter shuts down because the procedure took too long:
- Restart the meter.
- Check the correct strip batch code again.
- Wait for the appropriate strip prompt.
- Use a fresh strip where the previous strip has already been inserted or contaminated.
Prepare the lancet and other testing materials before beginning so the procedure can proceed without unnecessary delay.
TrueHb Strip Storage Can Cause Troubleshooting Problems
Strip condition should always be considered when unexpected errors or variable results occur.
Check whether the strips:
- Are expired
- Were left exposed to air
- Were stored in excessive heat
- Became wet
- Were kept outside their original vial
- Are physically damaged
For detailed storage information:
Read the TrueHb Test Strips Expiry & Storage Guide
TrueHb Quick Troubleshooting Decision Path
Meter will not turn on?
→ Check battery charge, battery installation and display condition.
Error 1?
→ Strip was inserted too early. Remove it and wait for the strip symbol.
Error 2?
→ Recharge the battery.
Error 3?
→ Meter is too cold. Move to a suitable operating environment.
Error 4?
→ Meter is too hot. Allow it to return to a suitable operating temperature.
Error 5?
→ Reduce ambient light and move away from strong/direct illumination.
Strip not recognised?
→ Check compatibility, orientation, full insertion and strip condition.
Test will not progress?
→ Check workflow order and batch-code acceptance.
Unexpected or inconsistent result?
→ Check blood sampling, sample volume, strips, batch code, optical cleanliness and meter condition.
When Should You Repeat a TrueHb Test?
A repeat test may be reasonable when:
- The first sample was clearly inadequate
- The strip was inserted incorrectly
- The wrong batch code had been selected
- Blood was applied incorrectly
- The test sequence was interrupted
- The strip was visibly damaged
- An environmental error occurred
Use a new test strip for the repeat measurement.
When Should You Stop Repeating Tests?
Do not continue repeatedly testing until the meter displays a result you expect.
If:
- The same abnormal result repeatedly appears
- Results remain widely inconsistent
- The result does not fit the person's clinical condition
- Symptoms are concerning
- A treatment decision depends on an accurate Hb value
appropriate laboratory confirmation or medical evaluation should be considered.
When Might the TrueHb Meter Need Technical Support?
Technical inspection or manufacturer/distributor support may be appropriate if:
- The meter will not power on after charging
- The meter will not charge
- The display is damaged
- The meter has suffered significant physical damage
- Fresh compatible strips repeatedly fail
- Results remain widely inconsistent despite correct technique
- The optical system appears damaged
- Errors persist after the recommended troubleshooting steps
Do not open or attempt unauthorised repair of the meter.
TrueHb Troubleshooting Checklist
- ✓ Correct standard TrueHb Hemometer
- ✓ Genuine TrueHb test strip
- ✓ Correct three-digit batch code
- ✓ Strip inserted only after strip symbol appears
- ✓ Strip inserted fully and correctly
- ✓ Strip within expiry
- ✓ Strip stored correctly
- ✓ Adequate blood sample
- ✓ Correct sample application
- ✓ Finger not excessively squeezed
- ✓ Meter clean
- ✓ Battery adequately charged
- ✓ Meter used within permitted temperature
- ✓ Meter protected from excessive ambient light
- ✓ Fresh strip used for every repeat test
TrueHb Error Codes FAQ
What does TrueHb Error 1 mean?
Error 1 means the test strip was inserted before the meter displayed the strip symbol. Remove the strip and wait for the correct prompt before inserting a strip.
What does TrueHb Error 2 mean?
Error 2 indicates an exhausted battery. Recharge the TrueHb meter before testing.
What does TrueHb Error 3 mean?
Error 3 means the meter is below its permitted operating temperature. Move it to a suitable environment and allow it to reach the appropriate operating temperature before testing.
What does TrueHb Error 4 mean?
Error 4 indicates that the meter is above its permitted operating temperature. Move it away from heat and allow it to cool naturally before testing.
What does TrueHb Error 5 mean?
Error 5 indicates excessive ambient light or direct exposure to a strong light source. Move to a normally lit environment.
Why does my TrueHb meter not recognise the strip?
Check that the strip is genuine TrueHb, correctly oriented, fully inserted, unused, undamaged and inserted only after the meter displays the strip symbol.
Why is the batch code important?
The standard TrueHb Hemometer uses the strip pack's three-digit batch code as part of its testing workflow. Check the displayed code against the current strip vial before testing.
What should I do if the TrueHb meter gives very different readings?
Review the meter's optical cleanliness, blood-sampling technique, sample volume, strip condition, strip storage and meter condition. Use a fresh correctly stored strip when repeating the test.
Can I add more blood if the sample was too small?
Do not assume that adding blood later will produce a valid test. Follow the manufacturer's instructions and use a fresh strip for a repeat measurement when the original test has been compromised.
Can I reuse a TrueHb strip after an error?
No. If blood has been applied or the strip has been compromised during a failed test, use a fresh strip.
Why does strong light affect TrueHb?
TrueHb uses reflectance photometry. Excessive external light can interfere with suitable optical measurement conditions, which is why the meter includes a high-light error.
Should I keep repeating an unexpected Hb result?
No. Review the testing procedure and repeat appropriately with a fresh strip where necessary. Persistent or clinically important abnormal results may require laboratory confirmation.
Related TrueHb Guides
TrueHb Hemometer & Test Strips Complete Guide
Read the complete TrueHb Hemometer guide
TrueHb Test Strip Compatibility Guide
Check which strips are compatible with TrueHb
How to Use TrueHb Hemoglobin Meter & Test Strips
Follow the TrueHb test procedure step by step
TrueHb Test Strips Expiry & Storage Guide
Learn how to store TrueHb strips correctly
Hemoglobin Meters & Test Strips Complete Guide
Learn about hemoglobin meters and Hb testing
Quikchek Plus vs Mission vs TrueHb Comparison
Compare the three Hb meter systems
TrueHb Products Available from Microsidd
TrueHb Hemometer
Standard reusable TrueHb Hemometer for rapid quantitative hemoglobin measurement.
True Hb Test Strips – 50 Pack
Compatible replacement strips for the standard TrueHb Hemometer.
TrueHb Hemoglobin Meter with 50 Strips
TrueHb meter-and-strip combination for users requiring the meter together with a larger strip supply.
View TrueHb Meter with 50 Strips
Important Note
The numbered error messages in this article are based on the standard TrueHb Hemometer manual version that documents Errors 1–5.
TrueHb has existed in multiple hardware and documentation revisions. Operating ranges, prompts or troubleshooting behaviour may differ between revisions, particularly between the standard TrueHb Hemometer and newer TrueHb Nord.
Always follow the manual supplied with your exact meter when its instructions differ from general online guidance.
TrueHb provides quantitative hemoglobin measurement but does not replace a complete blood count or appropriate clinical evaluation. Unexpected or clinically important results may require laboratory confirmation and professional interpretation.