Battery Fault 0003
Encoder backup battery low — the lithium cell preserving absolute-encoder memory while the machine is off has fallen below threshold.
- Controls
- Mazatrol M730L
- Machine series
- Mazak PT-20
Causes
Encoder backup battery low — the lithium cell preserving absolute-encoder memory while the machine is off has fallen below threshold.
- Fabian Achavalyoutube
Mazak PT20. M730L CNC: Alarm Z52 Battery Fault 0003
- Fabian Achavalyoutube
How to clear it
- 1
Replace the encoder backup battery with the machine powered ON so absolute-position memory is preserved during the swap. Standard Mazak / Mitsubishi MR-J2 service procedure.
- Edge Precisionyoutube
Changing some of the backup batteries in the Mazak
- Edge Precisionyoutube
Additional notes
Edge Precision's general 'Back Up Batteries In Mazak' video shows the physical swap on a Mazak with MR-J2 drives — applicable here.
Confidence: medium · Two YouTube sources (Fabian for the code naming, Edge Precision for the physical swap). Edge Precision video doesn't name the Z52 code specifically but shows the same battery and machine family.
First sourced: 5/21/2026