FANUC Alarm SRVO-015 — SERVO System over heat
Error- Hardware
- cabinet cooling
- Controllers
- R-J3iB / R-30iA / R-30iB
- FANUC class
- SERVO
- Hardware family
- FANUC cabinet cooling and overheat alarms
FANUC SRVO-015 (“SERVO System over heat”): The temperature of the control unit is higher than the specified value. First check: 1. If the ambient temperature is higher than the specified temperature (45 degrees C), provide ventilation to reduce the ambient temperature to the specified value. Likely part: Cooling fan (Cooling fan).
Updated 2026-10-22 · LogrobotLM reference
Description
The temperature of the control unit is higher than the specified value.
Remedy
1. If the ambient temperature is higher than the specified temperature (45 degrees C), provide ventilation to reduce the ambient temperature to the specified value. 2. Check that the fans are operating normally. If not, check the fan motors and fan motor connection cables. Replace any faulty fan motor(s) and/or cables(s). 3. If the thermostat on the backplane printed circuit board is faulty, replace the backplane unit.
Field diagnosis
The internal cabinet temperature exceeds the limit; the robot stops one minute later.
What to check
- If the workshop exceeds 45 °C, ventilate or air-condition.
- Check the fans, cables and associated fuses.
- If everything is sound and the cabinet is cool, the main board thermostat is at fault: full backup, then main board.
- Note: A clogged air inlet filter drives the temperature up without any fan stopping.
Part to check / replace
FANUC SRVO-015 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 →