What does the "Mirrors Blocked" error mean?

When this error appears on your screen, it is likely referring to the four mirrors and lenses that need to be clear for the tool to calibrate itself. It is very likely that if you take light cloth to clear these mirrors that you will be able to clear this error.

Additional sub error codes related to "Mirrors Blocked:" "Field: Laser Signal Too Weak"

Attempt a Field Calibration First

Please first ensure the tool is level and manually run a field calibration. Ensure that you are working in an area with low vibrations.

If the error is still occurring, please try the troubleshooting steps below.

1. Inspect the Mirrors and Lens - Dry with Cloth

Please inspect the lens (1), the collimator (2), and the two calibration mirrors (3). These locations run your calibrations and measurements as the tool is being used, and if anything (usually water or dust) is inhibiting them, it could lead to calibration and measurement failures.

2. Inspect Condensation/Fog/Moisture within Telescope

Please remember that if the telescope has fog or any moisture inside the tool, the mirrors blocked error will likely appear. Please see this article on how to slowly remove any moisture that has collected internally on the lens of the tool. Also, make sure the tool has acclimated to the weather it is intended to work in.

3. Inspect Water Pooled on the Ground

Water reflection may be causing the mirrors to struggle to read each other. Inspect your jobsite - is there excessive water lightly pooled at your location? Look especially beneath the tool where you are stationed. If so, the tool could be mis-reading the mirrors because of excessive reflections from the water near the tool. 

4. Inspect Lighting Conditions

Light sources, especially when directly from the sun (as discussed here), can disrupt the sensors and cause the mirrors blocked error. Try to block direct light (especially sunlight) when running calibrations to prevent the error from appearing.

5. Consider the Weather and Jobsite Conditions

Are you working in high humidity or in an extremely foggy area? Are the conditions extremely wet, adding excessive moisture to the tool? Are the jobsite conditions excessively dusty? All of these conditions could trigger mirrors being blocked on the head unit.