Error Codes

When the device encounters a problem, it displays an error code. Use this reference to diagnose and resolve issues.

Error Code Reference

Code	Cause	Solution
Err10	Battery too low	Replace or recharge batteries
Err15	Target out of range	Move closer to target or use within rated range
Err16	Signal too weak / measurement timeout	Use a more reflective target surface or reflector
Err18	Signal too strong (saturated)	Use a less reflective target or add distance
Err26	Calculation out of display range	Measure target within valid range

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Detailed Troubleshooting

Err10 — Battery Low

Caution

The device cannot measure reliably with low battery.

Solutions:

1. Connect USB charger (5V/1A) and wait for full charge
2. Replace with fresh NI-MH rechargeable batteries
3. Do not use alkaline batteries if charging via USB

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Err15 — Out of Range

The target is beyond the device’s maximum measuring distance.

Solutions:

1. Move closer to the target
2. Check your model’s maximum range:
   • S60: 60m / S80: 80m / S100: 100m / S120: 120m
3. For long distances, use a laser target plate

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Err16 — Weak Signal

The laser beam isn’t returning enough light to the sensor.

Common causes:

• Target surface is too dark or absorptive
• Target surface is too far away
• Strong ambient light (sunlight) overwhelming the sensor
• Measuring angle too steep

Solutions:

1. Use a white or light-colored target
2. Use a laser reflector/target plate
3. Shade the target area from direct sunlight
4. Move closer to the target
5. Measure perpendicular to the surface

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Err18 — Signal Too Strong

The reflected laser is saturating the sensor.

Common causes:

• Very reflective surface (mirror, polished metal)
• Target too close
• Retroreflective material

Solutions:

1. Cover reflective surfaces with paper or cloth
2. Increase distance from target
3. Angle the device slightly off-perpendicular

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Err26 — Display Overflow

The calculated result exceeds display capacity.

Common causes:

• Pythagoras calculation with invalid inputs
• Legs longer than hypotenuse in indirect measurement

Solutions:

1. Verify your measurement geometry
2. Ensure right angles are truly 90°
3. Re-measure within valid parameters

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General Troubleshooting

Tip

If you see repeated errors, try turning the device off and on again. This resets the measurement system.

Device Won’t Turn On

1. Check battery installation (correct polarity)
2. Charge batteries via USB
3. Try fresh batteries

Inaccurate Readings

1. Clean the laser lens
2. Verify reference point setting
3. Check for interfering reflections
4. Use a tripod for stability

Bluetooth Won’t Connect (BT models)

1. Ensure device is powered on
2. Enable phone Bluetooth
3. Restart the Huepar app
4. Unpair and re-pair the device