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What This Guide Helps With
Use this guide when the system reports cooling, airflow, fan, or temperature problems caused by room conditions, ventilation blockage, utilities, or service-level cooling faults.
Step-by-Step Troubleshooting
1. Protect the Patient and Stop Scanning if Thermal Reliability Is Uncertain
Do not continue patient imaging when the system reports an unresolved overtemperature or cooling fault.
If there is burning odor, smoke, excessive heat, abnormal fan noise, or visible damage, shut down the affected equipment using the appropriate safe process and remove it from service.
Expected outcome: No patient depends on equipment with uncertain thermal safety.
2. Confirm the Exact Thermal or Cooling Symptom
Determine whether:
- The system reports an overtemperature condition.
- A fan sounds unusually loud or is not running.
- The problem occurs at startup or during scanning.
- The room recently became warm.
- The system shut down automatically.
- The condition is continuous or intermittent.
Record the exact displayed message.
Expected outcome: The thermal complaint and operating conditions are clearly documented.
3. Check Room Temperature and HVAC Operation
Assess the imaging and equipment-room environment.
Look for:
- HVAC outage.
- Unusually warm room conditions.
- Closed or blocked supply or return vents.
- Recent facilities work.
- Failed supplemental cooling serving the equipment area.
Coordinate with Facilities when room cooling is abnormal.
Expected outcome: The room environment is suitable for normal equipment operation.
If restoring room cooling resolves the fault and the system remains stable, complete verification and stop.
4. Inspect External Ventilation Areas
Without removing covers, inspect accessible ventilation openings around system equipment.
Look for:
- Boxes or supplies blocking vents.
- Dust accumulation visible externally.
- Equipment pushed too close to ventilation areas.
- Drapes or coverings restricting airflow.
Do not insert objects into vents or remove internal fan assemblies.
Expected outcome: External airflow paths are unobstructed.
If clearing an external obstruction resolves the fault, monitor system status and complete final verification.
5. Listen for Abnormal Fan Operation
From a safe external position, listen for:
- Grinding.
- Rattling.
- Repeated fan starting and stopping.
- A fan suddenly much louder than normal.
- Absence of expected airflow combined with a thermal warning.
Do not open covers to inspect internal fans unless specifically authorized and trained.
Expected outcome: No obvious external evidence of fan mechanical failure is present.
If abnormal fan behavior is evident, remove the system from service and escalate.
6. Check for Dust, Debris, and Environmental Contamination
Inspect accessible external surfaces and ventilation paths for heavy dust, construction debris, or contamination that could interfere with airflow.
Follow facility-approved cleaning methods only.
Expected outcome: External airflow surfaces are reasonably clean and unobstructed.
7. Check for Recent Utility or System Events
Determine whether the fault began after:
- Power interruption.
- HVAC maintenance.
- Equipment-room work.
- System relocation.
- Extended heavy utilization.
- A previous unexpected shutdown.
This information can help distinguish external infrastructure problems from internal cooling faults.
Expected outcome: Relevant external events are identified and documented.
8. Allow Safe Recovery and Restart if Appropriate
If the environmental cause has been corrected and there is no evidence of damage, allow the system to return to a safe normal condition and perform one approved controlled restart if appropriate.
Do not repeatedly restart a system that quickly returns to overtemperature.
Expected outcome: The system starts normally without recurring cooling or temperature warnings.
If the fault does not recur and system status remains stable, proceed to final verification.
9. Perform Final Functional Verification
Verify:
- Normal system startup.
- No active cooling or temperature fault.
- Stable operation during an approved test.
- No unusual fan noise.
- No burning odor or excessive external heat.
- Normal room HVAC operation.
Expected outcome: Thermal conditions remain stable during required system operation.
If all checks pass, troubleshooting is complete.
10. Escalate Persistent Thermal Faults
If cooling or overtemperature faults remain after external airflow, HVAC, environment, and normal restart conditions are verified, stop troubleshooting.
Expected outcome: The system is removed from service and escalated for qualified evaluation.
If the Problem Persists
Common external causes have been ruled out. Remaining possibilities may involve internal fans, cooling assemblies, temperature sensing, power supplies, internal airflow restrictions, liquid-cooling components where applicable, or other service-level conditions.
The device should be:
- Removed from service.
- Labeled Out of Service.
- Sent for repair or qualified system evaluation.
- Evaluated using appropriate Siemens Healthineers documentation and approved test equipment.
- Repaired only by qualified personnel.
Do not bypass thermal protection, defeat fan monitoring, or continue operating a repeatedly overheating system.
Following corrective service, verify thermal stability and required imaging performance before clinical use.
Knowing when to stop external troubleshooting and escalate is proper troubleshooting.
Clinical Use Tip
A system that becomes operational again only after cooling down should not automatically be returned to service unless the cause has been identified and stable operation verified.
Work Order Documentation (CCR Method)
CCR = Complaint, Cause, Resolution
Complaint
What was reported by the clinical staff.
Example:
"Clinical staff reported that the Biograph Vision displayed a temperature-related fault and became unavailable for scanning."
Cause
What was observed during troubleshooting.
Example:
"Clinical Engineering found equipment-room airflow restricted by supplies placed against an external ventilation area."
Resolution
What action was taken.
Example:
"Clinical Engineering cleared the obstruction, confirmed normal room airflow, restarted the system normally, verified stable operation without recurrence, and returned it to service."
Helpful Details to Include (If Known)
- Exact thermal message
- Room temperature concern
- HVAC status
- Ventilation obstruction
- Fan noise or airflow
- Burning odor or heat
- Recent facility work
- Whether shutdown occurred
- Restart result
- Final thermal status
Final Thought
Treat thermal faults seriously, verify room conditions and unobstructed airflow before assuming internal cooling failure, and never return a repeatedly overheating scanner to clinical use without stable verification.
That is successful troubleshooting.