// Heidenhain · Error code
Error code “Battery low NC”
on Gildemeister CTX and GDM
The NC backup battery of the control is weak. It sounds harmless — but at the next power cut it can mean the total loss of all parameters.
// Workshop
SINCE 1994
Gildemeister specialist
UNDER 24 H
Reply on business days
// Important first
We do not publish specific diagnostic steps.
Error codes are context-dependent. What is the right response on a CTX 400 with EPL2 would cause a second failure on a GDM with Eltropilot. Instead of a half-truth guide, we publish only the component class here — the real diagnosis we do by phone, in 5–10 minutes, free of charge and without promises.
// What we can say publicly
Battery low NC —
the rough picture.
// Component class
Where the fault sits.
Backup battery on the main board
// Machines affected
Where the code appears.
All Heidenhain EPL / EP controls with a backup battery. Many CT/CTX/GDM machines are affected too.
What the code means specifically on your machine depends on the year of manufacture, the control, the configuration and any previous maintenance. From 30 years of workshop experience we know the typical patterns — we place them for you over the phone.
Please note first
What you should not do yourself.
Before any battery replacement, all parameters and NC programs must be exported. The replacement sequence has to be correct — otherwise everything is lost.
In concrete terms: before any repair on a Gildemeister CNC, back up the parameters and NC programs. Replace a component only after a diagnosis, never on a hunch. If you are unsure: call us. Those 5 minutes often save a four-figure mistake.
// What you can do now
Battery low NC
narrowed down by phone.
In 5–10 minutes we work out with you on the phone what is really going on with your Gildemeister machine. Free of charge. No sales pressure. We know the code from workshop practice — no algorithm, no bot.
05221 · 9944770Workshop hotline · Mon–Fri 8am–4pm · reply within 24h on business days
// Prefer it in writing
// Related error codes
Other codes,
similar component class.
// All codes
Gildemeister Error Code Overview
// Heidenhain
PLC 200 — Tool Turret, Switches, PLC Logic
// Heidenhain
PLC 345 — Tool Turret, Overcurrent
// Heidenhain
K7302 — Internal Software Error
// Gildemeister
Error Code 1208 — Emergency Stop Circuit
// Gildemeister
Error Code 4706 — Axis Plain-Text Fault
// FREQUENTLY ASKED QUESTIONS
What does 'Battery low NC' mean on a Gildemeister?
The NC backup battery of the control is weak. It sounds harmless — but at the next power cut it can mean the total loss of all parameters.
Which Gildemeister machines are affected?
All Heidenhain EPL / EP controls with a backup battery. Many CT/CTX/GDM machines are affected too.
What is usually behind it?
From 30 years of workshop practice: usually the backup battery on the main board. An exact diagnosis requires a machine-specific workshop check or a preliminary phone diagnosis with ESDI.
What should I NOT do myself?
Before any battery replacement, all parameters and NC programs must be exported. The replacement sequence has to be correct — otherwise everything is lost.