OVERTEMPERATURE APC by Schneider Electric — Rack / PDU Overtemperature

At a glance

Severity: WARNING THEN STOP
Domain: POWER_DISTRIBUTION_SYSTEM
Reference standard: ASHRAE TC9.9 / IEC 61439-2

What it means

Temperature inside the rack or the PDU exceeds limits: compromised airflow or overload. Protection derating and server shutdown risk.

Probable causes

Missing blanking panels and hot air recirculation inside the rack
Cold aisle inlet temperature above range
Rack fan tray failed or absent
Cabling obstructing front-to-rear airflow
PDU overload with self-heating

Where to start

Measure rack inlet temperature (front, cold aisle) and outlet (rear, hot aisle) and compare with ASHRAE guidelines.

Full guided diagnosis in the app

The diagnostic tree for this fault has 5 guided steps with measurements, checks and resolutions. You'll find it in DataCIQ, one of the five IndexOS apps: free, works offline.

Open DataCIQ

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The same fault on other brands

TEMPERATURE HIGH Rittal

More APC by Schneider Electric codes

OVERLOAD — Branch Circuit Overload / Breaker Trip
PHASE IMBALANCE — Phase Imbalance
ON BATTERY — On Battery / Utility Failure
ON BYPASS — On Bypass / Inverter Fault
OVERLOAD — Output Overload
OVERTEMPERATURE — Internal Overtemperature
REPLACE BATTERY — Replace Battery / Battery Fault