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What This Guide Helps With
This guide helps troubleshoot Error FC-001 on the 3M Bair Hugger 775 Series Patient Warming System. FC-001 indicates an internal sensor 1 over-temperature condition and may also occur as a cautionary in-use fault when the hose end at the patient end is occluded.
This condition may interrupt patient warming and can be caused by hose occlusion, restricted airflow, incorrect hose or blanket setup, internal over-temperature sensing, or a sensor-related fault condition.
Step-by-Step Troubleshooting
Ensure Patient Safety First
- Remove the warming unit from patient use if FC-001 occurs during active warming.
- Stop use of the Bair Hugger unit.
- Disconnect the hose from the patient warming blanket if clinically appropriate.
- Notify clinical staff that warming may be interrupted.
- Use another warming unit if active patient warming is still required.
- Do not continue using the unit if FC-001 remains active or repeats.
Patient warming should be transferred or stopped safely before troubleshooting begins.
Verify the Reported Error and Behavior
- Confirm that the displayed fault is FC-001.
- Ask staff when the fault occurred.
- Determine whether the fault occurred during startup, during active warming, after moving the hose or blanket, or after the hose end was blocked, bent, covered, or positioned incorrectly.
- Observe whether the fault clears after the unit cools and is restarted.
FC-001 may represent a true internal sensor over-temperature fault, but it can also occur from hose-end occlusion during use.
Disconnect Power and Allow the Unit to Reset
- Turn the unit off.
- Disconnect it from AC power.
- Wait at least 30–60 seconds before reconnecting power.
- Do not immediately restart repeatedly without checking the hose and airflow path.
This allows the unit to power down fully and helps determine whether the condition was temporary.
Check for Hose Occlusion at the Patient End
- Inspect the hose end where it connects to the warming blanket or hose card.
- Check whether the hose end is blocked by bedding.
- Check whether the hose is pushed too far into material.
- Look for a folded, kinked, or pinched hose.
- Verify that the hose outlet is not covered by drapes or patient positioning.
- Confirm the hose is correctly placed into the hose card.
- Correct the hose position if needed.
A blocked hose can reduce airflow and cause localized heat buildup, which may trigger FC-001.
Inspect the Hose and External Air Path
- Check the full hose length for kinks, crushing, tears, contamination, debris, or improper attachment.
- Confirm the hose is securely connected to the warming unit.
- Verify that airflow is not restricted at the unit end or patient end.
Restricted airflow can create an over-temperature condition even if the heater and sensor system are functioning normally.
Check the Warming Blanket or Hose Card Setup
- Verify that the correct warming blanket or hose card setup is being used.
- Confirm the hose is inserted the correct way.
- Check that blanket material is not blocking the hose outlet.
- Confirm staff are not using the hose without the proper warming blanket connection.
Improper setup can trap warm air and mimic a device fault.
Reconnect Power and Test Operation
- Reconnect AC power.
- Power the unit on.
- Run the unit and observe whether FC-001 returns.
- Confirm that airflow is present at the hose outlet.
- Monitor for abnormal heat, odor, fan noise, or repeated faulting.
If the hose occlusion was the cause, FC-001 should not return and airflow should remain normal.
Isolate User Setup vs Device Fault
- If FC-001 occurred during patient use, ask staff whether the hose was blocked, covered, or positioned tightly against bedding.
- If available, test with a known-good hose and proper blanket setup.
- Run the unit under normal conditions and observe for repeat faulting.
- If the fault does not repeat, the likely cause was hose occlusion or setup-related restriction.
- If FC-001 repeats, suspect an internal sensor, hose-related detection issue, airflow issue, heater control issue, or control-related fault condition.
Clinical Engineering should rule out external causes before assuming an internal device failure.
If the Problem Persists
If FC-001 remains active or returns after the hose occlusion is removed, external causes have been ruled out.
- Remove the unit from service.
- Label it Out of Service.
- Send it for repair or bench evaluation.
Persistent FC-001 may indicate an internal sensor over-temperature fault, sensor-related failure, airflow or heater control issue, or another internal device condition requiring service evaluation.
Clinical Use Tip
Never troubleshoot an over-temperature fault while the unit is actively warming a patient. Move the patient to a backup warming device first if warming is still clinically needed. Never rely on a patient warming unit that has an unresolved or repeating FC-001 fault.
Work Order Documentation (CCR Method)
CCR = Complaint, Cause, Resolution
Complaint
What was reported by the clinical staff.
Example:
"Bair Hugger 775 reported FC-001 during patient warming. Staff stated the fault occurred while the hose end was positioned near the patient blanket."
Cause
What was observed during troubleshooting.
Example:
"Found hose end occluded/mispositioned at the patient end, causing restricted airflow and cautionary FC-001 over-temperature condition. No permanent fault observed after correcting hose position."
Resolution
What action was taken.
Example:
"Disconnected unit from power, removed hose occlusion, repositioned hose correctly into hose card, waited 30–60 seconds, reconnected power, and tested operation. FC-001 did not return. Unit returned to service."
Helpful Details to Include (If Known)
- Alarm behavior
- Accessories swapped
- Power behavior
- Environmental factors
- Indicator lights
- Final device status
Final Thought
FC-001 should be treated as a patient safety-related warming fault. Start with the simple and likely causes first: hose occlusion, hose position, airflow restriction, and setup. If the fault clears and does not return, document the correction clearly. If the fault persists, remove the unit from service and escalate for repair.
That is successful troubleshooting.