Ewert Energy Systems Orion BMS Fault Code P0A04 Support

Technical support document for Orion BMS fault code P0A04, detailing causes, behavior, thresholds, and diagnostic steps for open wiring faults.

Brand: Ewert Energy Systems
Category: Other Electronics
Document type: Service Manual
Language: English
Pages: 7
File format: PDF
File size: 144 KB
Published: 14 November, 2026
Updated: 14 November, 2026
MD5 checksum: 2CFFC022F4F862F9D53E466472B62F71
PDF: Ewert Energy Systems Orion BMS Fault Code P0A04 Support PDF

About this manual

This document provides technical support for the Orion BMS family, specifically addressing fault code P0A04, which indicates an open or high resistance connection in cell tap wires. The supported product families include Orion BMS (24-180 Cell), Orion BMS 2 (24-180 Cell), Orion JR (16 Cell), and Orion JR 2 (16 Cell).

What's inside

Fault Description
Fault Behavior
Fault Thresholds
Diagnostic Steps
Possible Trouble Area

Specifications

Test Interval	Every 15 seconds
Trigger Count	At least 3 triggers
Hysteresis	One minute

Frequently asked questions

What does fault code P0A04 indicate?

It indicates an open or high resistance connection was detected by the BMS on one or more cell tap wires.

What is the behavior of the system when P0A04 occurs?

The system triggers Voltage Failsafe Mode, which inhibits charging or discharging of the battery pack.

Which Orion BMS models support this fault code?

The code is supported by Orion BMS (24-180 Cell), Orion BMS 2 (24-180 Cell), Orion JR (16 Cell), and Orion JR 2 (16 Cell).

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