FANUC Alarm SRVO-253 — Amp internal over heat
Error- Hardware
- servo amplifier
- Controllers
- R-30iA / R-30iB
- FANUC class
- PAUSE
Manufacturer wording — Amp internal over heat(G:%d A:%d)
The manual prints placeholders; your controller fills them in with the real group, axis or number.
FANUC SRVO-253 (“Amp internal over heat”): An amplifier internal overheat was detected. First check: Check that the cooling fan is working properly, or replace the amplifier. Likely part: Servo amplifier (Servo amplifier).
Updated 2026-10-22 · LogrobotLM reference
Description
An amplifier internal overheat was detected.
Remedy
Check that the cooling fan is working properly, or replace the amplifier.
Field diagnosis
Overheating detected inside the amplifier.
What to check
- Check the amplifier fan and the cleanliness of the vents; if cooling is correct, replace the amplifier.
- Note: PAUSE alarm: the robot resumes, but the amplifier ages quickly in this condition.
Part to check / replace
FANUC SRVO-253 points to the hardware below — start here before ordering.
Tap a part for every code that points to it — and verify the exact variant for your controller before ordering.
Related codes
Same hardware involved
Indicative field information — the robot manufacturer's manual and safety procedures always prevail. Never bypass a safety device; apply lockout/tagout (LOTO) before any physical intervention. How this reference is built →