FANUC Alarm SRVO-049 — SERVO OHAL1 alarm
Error- Hardware
- fuses
- Controllers
- R-J3iB / R-30iA / R-30iB
- FANUC class
- SERVO
Manufacturer wording — SERVO OHAL1 alarm (Grp:%d Ax:%d)
The manual prints placeholders; your controller fills them in with the real group, axis or number.
FANUC SRVO-049 (“SERVO OHAL1 alarm”): The servo amplifier's built-in thermostat was actuated. First check: 1. Check the operating conditions of the robot. Likely part: Servo amplifier (Servo amplifier).
Updated 2026-10-22 · LogrobotLM reference
Description
The servo amplifier's built-in thermostat was actuated. The LED indicator on the servo amplifier PSM displays '3'.
Remedy
1. Check the operating conditions of the robot. If any of the ratings specified for the robot, such as its rated duty cycle or load, are exceeded, modify the use of the robot so that the ratings are not exceeded. 2. Check whether the fuse (F1, F2) in the servo amplifier has blown. 3. Replace the servo amplifier. 4. If this does not clear the alarm, verify that all connectors are securely connected. 5. Replace the transformer.
Field diagnosis
The transformer thermostat has tripped, or an internal amplifier fuse has blown; on R-30iB the signal passes through an amplifier connector.
What to check
- Check the overheat signal connection on the amplifier (CRMA91 on R-30iB), look for a missing phase, allow to cool.
- Then emergency stop unit, then amplifier.
- Note: A missing phase heats the transformer before the power drops out: OHAL1 often precedes DCLVAL.
Part to check / replace
FANUC SRVO-049 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 →