Leica ERR-001 Error: What It Means and How to Fix It

Applies to: Leica GS18, GS10, GS15, GS14 GNSS rovers

What Does ERR-001 Mean?

ERR-001 No Satellites on Leica GNSS receivers means the receiver hardware is not detecting any satellite signals. This is different from a low-satellite-count condition — ERR-001 indicates zero satellites tracked.

On a properly functioning Leica GS18 or GS15 at an open-sky location, the receiver normally tracks 20-35 satellites across GPS, GLONASS, Galileo, and BeiDou constellations. Zero satellites means the RF signal chain from the antenna to the receiver processor is completely interrupted.

The most common causes are antenna disconnection or damage. Under normal startup, ERR-001 is expected for the first few seconds before the receiver acquires its first satellites. Persistent ERR-001 beyond 30 seconds in an open area indicates a hardware or configuration problem.

Common Causes of ERR-001

• Antenna cable disconnected from the receiver or the antenna base
• Damaged antenna cable — crushed, kinked, or severed coaxial cable
• Failed GNSS antenna — antenna internal components failed (common after impacts)
• Constellation settings disabled — all constellations turned off in Leica Captivate
• Firmware corruption — rare, but corrupted firmware can disable RF processing
• Indoor operation — antenna has no line-of-sight to sky

How to Fix Leica ERR-001 — Step by Step

1. Verify the GNSS antenna is connected to the receiver. On the GS18, check the TNC connector is hand-tight. On GS10/GS15, check both the antenna and receiver TNC connections.
2. Inspect the antenna cable for visible damage — kinks, cuts, crush points. Replace the cable if damage is found.
3. Carry the receiver to a clear outdoor location with an unobstructed sky view and wait 30-60 seconds. ERR-001 should clear if the antenna and cable are functional.
4. Check constellation settings in Leica Captivate. Navigate to GNSS settings and confirm GPS, GLONASS, Galileo, and BeiDou are all enabled.
5. Power cycle the receiver completely. Hold the power button until the unit shuts off, then restart from cold.
6. If available, swap with a known-good antenna. If ERR-001 clears with the replacement, the original antenna has failed.

When to Send It In for Service

If ERR-001 persists in a clear open-sky location with a verified antenna cable and connection, the receiver RF front end has likely failed. Contact an authorized Leica dealer for diagnosis.

Frequently Asked Questions

How quickly should a Leica GS18 acquire satellites?

At an open-sky location with a valid almanac, the GS18 typically acquires enough satellites for an autonomous position within 30-60 seconds. A full multi-constellation fix with good PDOP usually appears within 90 seconds.

Can ERR-001 appear after the unit has been working fine?

Yes — sudden ERR-001 after the unit was working indicates a new hardware issue: most commonly an antenna cable that became disconnected, kinked, or damaged during field operation. Inspect the cable first.

Does a factory reset fix ERR-001?

Rarely. ERR-001 is almost always caused by an antenna or cable hardware problem, not a software issue. A factory reset should only be tried as a last resort before sending the unit for service.

Related Leica Error Codes

Leica GNSS ERR-002 RTK Float | Leica GNSS ERR-003 Age of Corrections