Server Room High Temperature Alarm: Causes, Testing Tools and Troubleshooting Malaysia
A high-temperature alarm in a server room should not be cleared without investigating the cause.
The alarm may be triggered by a complete cooling-system failure, but it can also result from a blocked rack, failed fan, incorrect sensor position or short-duration temperature spike.
Using suitable server room temperature troubleshooting tools helps Malaysian maintenance teams determine whether the problem affects the entire room, one network rack or only the alarm sensor.
What Can Cause a High-Temperature Alarm?
Common causes include:
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Air-conditioning failure
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Cooling unit switched off
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Dirty or blocked filter
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Failed cooling fan
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Restricted airflow
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Hot-air recirculation
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Missing rack blanking panels
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High server load
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New equipment installation
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Overloaded network rack
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Open server-room door
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Incorrect cooling setting
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Failed temperature sensor
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Poor sensor placement
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Power interruption
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UPS or electrical problem
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Cooling-control malfunction
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Blocked raised-floor outlet
The alarm location and time provide important clues.
Tools for Investigating the Alarm
A practical toolkit may include:
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Temperature and humidity meter
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Temperature data logger
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Temperature and humidity data logger
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Thermal imaging camera
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Airflow meter
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Differential pressure meter
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Clamp meter
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Sound level meter
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Vibration meter
Each instrument answers a different question about the temperature problem.
Step 1: Confirm the Alarm
Check:
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Alarm location
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Alarm time
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Displayed temperature
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Alarm duration
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Whether the alarm remains active
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Which sensor generated it
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Whether other sensors also alarmed
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Previous alarm history
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Recent maintenance work
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Recent equipment changes
Do not assume the whole room overheated because one sensor generated an alarm.
Step 2: Check for Immediate Critical Conditions
Observe:
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Server and network-equipment alarms
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Cooling-unit operating status
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Unusual smell
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Visible smoke
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Electrical warning indicators
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UPS status
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Excessive equipment noise
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Water leakage
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Multiple temperature alarms
Follow the facility’s emergency procedure when critical conditions are present.
Step 3: Verify the Temperature With a Handheld Meter
Use a temperature and humidity meter to check:
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Near the alarm sensor
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General room area
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Front of nearby racks
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Rear of nearby racks
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Top, middle and bottom of the rack
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Cooling-unit intake and outlet
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Hot and cold aisles
If the handheld reading differs significantly from the installed sensor, investigate the sensor, position and measurement conditions.
Step 4: Check the Alarm Sensor Position
An incorrectly positioned sensor may be affected by:
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Direct server exhaust
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Cooling outlet
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External wall
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Door opening
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Hot electrical equipment
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Blocked airflow
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Sunlight
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Recent relocation
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Loose mounting
The sensor should represent the condition it is intended to monitor.
Step 5: Inspect the Cooling System
Check:
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Cooling unit is running
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Correct operating mode
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Setpoint
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Alarm indicators
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Fan operation
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Filter condition
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Air inlet
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Air outlet
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Drainage
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Condensation
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Unusual noise
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Electrical supply
A cooling unit may appear to run while delivering insufficient airflow or cooling capacity.
Step 6: Measure Airflow
Use an airflow meter at:
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Cooling outlets
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Perforated floor tiles
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Rack fronts
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Suspected weak-airflow areas
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Locations near the alarm sensor
Compare with:
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Other outlets
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Previous measurements
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Similar cooling units
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Site requirements
Low airflow may be caused by a blocked filter, fan problem, closed damper or obstruction.
Step 7: Check Differential Pressure
Where the cooling system uses raised floors or aisle containment, measure pressure differences between relevant locations.
Possible test points include:
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Raised floor and server room
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Cold aisle and surrounding space
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Server room and corridor
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Upstream and downstream of filter
Record both measurement points clearly.
Step 8: Perform Thermal Scanning
Use a thermal camera to scan:
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Network racks
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Servers
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Network switches
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Rack PDUs
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UPS equipment
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Electrical panels
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Cooling-unit electrical components
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Fan motors
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Areas around the alarm sensor
The Noyafa NF-522 Thermal Camera can help identify the exact location of abnormal heat.
A high room-temperature alarm may originate from one localised hotspot rather than the entire room.
Step 9: Check the Network Rack
Inspect the affected rack for:
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Missing blanking panels
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Blocked air intakes
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Blocked exhaust outlets
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Failed equipment fans
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High-load equipment
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Excessive cabling
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Open rack spaces
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Incorrect equipment orientation
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Hot-air recirculation
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Overloaded PDU connections
Take readings at different rack heights.
Step 10: Review Recent Equipment Changes
Ask whether:
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New servers were installed
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Equipment was moved
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Rack loading increased
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Cable management changed
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Blanking panels were removed
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Cooling settings changed
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A cooling unit was isolated
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Maintenance work blocked airflow
A recent change may explain why the alarm began.
Step 11: Install a Data Logger
A data logger can confirm whether the temperature problem:
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Occurs overnight
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Appears only at peak load
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Follows a regular cooling cycle
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Happens during weekends
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Lasts only a few minutes
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Affects one location
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Continues after maintenance
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Is associated with door opening
Use the Elitech RC-5 when temperature recording is required.
Use a suitable temperature-and-humidity logger, such as the Elitech GSP-6 Pro, when both parameters must be recorded.
Step 12: Compare Multiple Locations
For a complete investigation, compare:
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General room reference
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Alarm-sensor location
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Front of affected rack
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Rear of affected rack
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Top of affected rack
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Nearby normal rack
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Cooling-unit outlet
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UPS or electrical area
This helps distinguish a room-wide problem from a local issue.
Step 13: Review Alarm Timing
Compare the alarm time with:
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Cooling-unit operation
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Server-load increase
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Backup activity
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Door access
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Maintenance work
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Power interruption
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UPS transfer
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New equipment start-up
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Building HVAC schedule
A repeated alarm at the same time each day often indicates an operational pattern rather than a random fault.
Step 14: Check Cooling-Fan Condition
Inspect cooling and equipment fans for:
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No operation
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Intermittent operation
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Rattling
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Grinding
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Excessive vibration
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Dust accumulation
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Reduced airflow
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Abnormal temperature
A sound level meter or vibration meter can support further investigation.
Step 15: Check Electrical Load
Qualified technicians may use a clamp meter to assess the current drawn by:
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Cooling units
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Fan motors
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Pumps
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Compressors
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High-load rack circuits
An electrical problem may reduce cooling performance or increase local heat.
Step 16: Identify the Corrective Action
Possible corrective actions include:
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Restore cooling-unit operation
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Replace or clean filters
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Repair a fan
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Remove airflow obstruction
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Install blanking panels
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Improve cable management
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Correct aisle containment
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Adjust cooling settings
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Relocate the temperature sensor
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Reduce rack heat load
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Repair electrical equipment
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Correct door-access practice
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Add continuous monitoring
The corrective action should address the confirmed cause rather than only clearing the alarm.
Step 17: Verify the Result
After correction:
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Repeat handheld temperature measurement
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Check airflow
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Repeat thermal scanning
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Confirm alarm has cleared
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Monitor equipment status
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Continue data logging
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Compare with the original condition
A short normal reading does not confirm that an intermittent problem has been resolved.
Example: Alarm Occurs Every Night
Possible causes include:
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Reduced overnight cooling
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Building HVAC schedule
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Cooling-unit rotation
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Different server load
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Closed ventilation path
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Automatic control setting
Install a logger and compare the alarm time with cooling operation.
Example: Alarm Occurs Only at the Top of One Rack
Check for:
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Hot-air recirculation
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High-load upper equipment
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Failed fan
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Missing blanking panel
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Blocked upper airflow
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Cable congestion
Use a thermal camera and airflow meter to locate the problem.
Example: Sensor Alarms but Handheld Meter Is Normal
Possible causes include:
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Sensor error
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Sensor located in direct hot air
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Incorrect alarm setting
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Slow sensor response
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Poor mounting
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Different measurement location
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Logger or controller time mismatch
Compare both instruments at the same location and allow them to stabilise.
Example: Temperature Is High After New Equipment Installation
Check:
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Added heat load
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Rack position
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Power consumption
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Airflow requirements
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Cooling capacity
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Equipment orientation
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Rack blanking panels
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Hot-aisle containment
Cooling capacity and distribution should be reviewed when equipment load changes.
Temperature Meter Versus Data Logger
| Requirement | Handheld meter | Data logger |
|---|---|---|
| Check current temperature | Yes | Yes |
| Compare several locations quickly | Yes | Limited |
| Confirm overnight alarm | No | Yes |
| Identify alarm duration | No | Yes |
| Record repeated cycles | No | Yes |
| Support immediate walkthrough | Strong advantage | Supporting tool |
Use both when the alarm is intermittent.
Data Logger Versus Thermal Camera
| Requirement | Data logger | Thermal camera |
|---|---|---|
| Show when the alarm occurred | Yes | No |
| Locate a rack hotspot | No | Yes |
| Record conditions for several days | Yes | No |
| Inspect UPS and switchgear | No | Yes |
| Monitor humidity | Model dependent | No |
| Visualise heat distribution | No | Yes |
Together, they identify both the timing and location of the problem.
Common Troubleshooting Mistakes
Avoid:
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Clearing the alarm without investigation
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Checking only the room thermostat
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Measuring only at the centre of the room
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Ignoring the top and rear of racks
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Assuming the air conditioner is effective because it is running
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Installing a logger directly in cooling air
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Ignoring airflow
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Failing to review recent equipment changes
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Replacing the alarm sensor before comparison testing
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Reviewing only maximum logger temperature
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Failing to monitor after corrective work
Quick High-Temperature Alarm Checklist
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Confirm the alarm time, location and duration.
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Check for immediate critical conditions.
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Verify with a handheld meter.
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Inspect the sensor position.
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Check cooling-unit operation.
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Measure airflow.
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Check pressure where applicable.
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Scan racks and electrical equipment thermally.
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Inspect the affected rack.
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Review recent changes.
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Install data loggers.
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Compare multiple locations.
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Match the alarm with operating events.
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Correct the confirmed cause.
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Repeat measurements and monitoring.
Find the Cause Before Resetting the Alarm
A server-room high-temperature alarm is a symptom, not a complete diagnosis.
By combining handheld temperature measurement, data logging, thermal imaging and airflow testing, maintenance teams can determine whether the alarm results from a room-wide cooling failure, local rack hotspot or incorrect sensor condition.
This evidence-based approach helps prevent repeated alarms and reduces the risk of data-centre equipment overheating.
Contact MTM Precision
MTM Precision Sdn. Bhd.
Showroom & Service Centre
No. 29-1 & 29-2, Jalan Bandar 18,
Pusat Bandar Puchong,
47160 Puchong, Selangor, Malaysia
🌐 Website: www.mtmpre.com.my
📧 Email: mtmpre@yahoo.com
📱 WhatsApp: +6016-660 7346
02 Sep 2026
