Over Temperature
Advice UPS (Uninterruptible Power Supply)
Severity: ModerateWhat Does This Error Mean?
An over-temperature warning on an Advice UPS means the internal temperature has exceeded the safe operating limit. The UPS will reduce performance or shut down to prevent damage to the battery and electronics. This is almost always caused by inadequate ventilation, a hot environment, or a blocked air intake.
Affected Models
- Advice UPS Line-Interactive Series
- Advice UPS Online Series
- Advice UPS (all models)
Common Causes
- UPS placed in an enclosed cabinet or cupboard with no airflow
- Ventilation slots on the UPS sides or rear blocked by objects or positioned against a wall
- High ambient room temperature — server room, cupboard, or outdoor enclosure in summer
- Internal fan failed — cooling fan inside the UPS has stopped working
- UPS running at high load for extended periods generating more heat than normal
How to Fix It
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Immediately check the ventilation around the UPS.
Ensure there is at least 10–15 cm of clear space on all sides of the UPS, especially at the ventilation slots. If the UPS is in a closed cabinet, open the cabinet doors to allow airflow.
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Move the UPS to a cooler location if possible.
UPS units should be operated in a room with ambient temperature below 25–30°C. A server cupboard or enclosed cabinet in a warm room can easily exceed 40°C, which significantly shortens battery life as well as triggering over-temperature alarms.
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Listen for the internal cooling fan.
Larger UPS units have an internal fan that runs when the unit is under load or warm. If the fan is not running and the UPS is warm, the fan may have failed — call a UPS service technician.
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Reduce the load on the UPS if it is running near capacity.
A UPS running at 80–100% of its rated load generates more heat than one running at 50% load. Move non-essential equipment to a separate power strip to reduce the load and the heat generated.
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Allow the UPS to cool and check whether the alarm clears.
Once the temperature drops below the threshold, the alarm will clear automatically. If the alarm returns quickly after clearing, the ventilation fix was insufficient or the fan has failed.
Frequently Asked Questions
Does heat damage the Advice UPS battery permanently?
Yes — operating at high temperatures is the leading cause of premature UPS battery failure. Every 10°C above 25°C roughly halves the expected battery service life. A UPS that regularly runs at 35°C will need its battery replaced after 18 months instead of the normal 3–5 years.
Can the UPS work during an over-temperature condition?
The UPS will continue to provide power to connected devices during an over-temperature alarm, but will shut down if temperature continues to rise. An abrupt shutdown during a power cut could cause data loss on connected computers. Fix the ventilation issue to prevent an unexpected shutdown.