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What This Guide Helps With
Troubleshooting inadequate or unstable warmed-air output caused by setup, blanket, airflow, filter, power, alarm, or temperature-verification issues.
Step-by-Step Troubleshooting
1. Ensure Patient Safety First
Remove the WarmTouch WT 6000 from active patient use if warming is inadequate, unstable, or associated with an alarm.
Move the patient to a known-working warming system or approved alternative warming method according to clinical procedure before troubleshooting.
Do not operate the blower hose directly on a patient without an attached WarmTouch blanket.
Expected outcome: The patient is no longer dependent on a warming device with questionable heat output.
Why it matters: Inadequate or unstable warming can prevent effective temperature management, and the unit may shut down heat and airflow when output temperature is outside specification.
2. Confirm the Reported Symptom and Check for Alarms
With the unit removed from clinical use, power it on and document:
- Selected temperature setting
- Displayed temperature behavior
- Whether the temperature rises and stabilizes
- Any audible alarm or displayed alarm message
- Whether the fan continues running or shuts down
The unit should complete power-on self-test, display the main screen, and show stable temperature response after a heated setting is selected.
Expected outcome: The complaint is confirmed and any error or alarm information is captured before further evaluation.
Stop if resolved: If the unit powers on normally, reaches stable temperature, and no alarm recurs during verification, document the findings and complete required safety checks before returning it to service.
3. Inspect the Power Source and Power Cord
Verify that the unit is connected to a hospital-grade grounded outlet and that the power cord is fully seated at the warming unit.
Inspect the power cord and plug for damage, looseness, overheating, discoloration, or intermittent connection. Test using a known-good outlet and approved compatible power cord when available.
Expected outcome: The status indicator and display remain stable during operation, with no intermittent power loss or reset.
Why it matters: A secure grounded power connection is required for reliable unit operation and electrical safety.
4. Verify Correct Operating Mode and Temperature Selection
Confirm that the unit is in treatment mode rather than standby or ready mode.
- Standby mode: amber status LED, display off, heater off, fan off.
- Ready mode: green status LED, display on, heater off, fan off.
- Treatment mode: green status LED, display on, fan on, heater commanded as needed.
Select a heated temperature setting and observe whether the displayed temperature begins rising and stabilizing.
Expected outcome: The fan runs and the displayed temperature responds to the selected heated setting.
Stop if resolved: If the issue was caused by the unit remaining in ready mode or an incorrect setting, verify proper function and document the correction.
5. Inspect the Hose and Nozzle Externally
Inspect the warming hose and nozzle for:
- Kinks, crushing, tears, punctures, or loose sections
- Visible contamination or obstruction
- Damaged nozzle or blanket-retaining clip
- Air leakage at the hose or nozzle
With the unit operating in a heated mode and disconnected from patient use, verify that airflow is present at the nozzle and does not appear weak or intermittent.
Expected outcome: The hose is intact, unobstructed, and delivering consistent airflow.
Why it matters: Restricted or leaking airflow can reduce effective heat delivery even when the unit is producing warm air.
6. Confirm Use of a Properly Attached WarmTouch Blanket
Verify that a compatible WarmTouch blanket is being used and that the hose nozzle is properly inserted and secured to the blanket inlet.
Inspect the blanket for:
- Incorrect connection or partial disconnection
- Tears or large leaks
- Compression under equipment or patient positioning
- Blocked air distribution channels
- Improper blanket type
Do not use non-WarmTouch blankets with this unit.
Expected outcome: A compatible blanket is securely attached and able to distribute warmed airflow properly.
Stop if resolved: If replacing or correctly connecting the blanket restores expected warming performance, document the blanket/setup issue and verify the unit operates normally.
Why it matters: The WarmTouch WT 6000 is designed for use with WarmTouch blankets, and blanket condition or attachment can directly affect warming performance.
7. Check the Air Intake and Filter Status
Inspect the rear air intake area externally for blockage from linens, packaging, dust accumulation, wall placement, or nearby equipment.
From the unit menu in ready mode, review the filter status information. If the unit displays a filter replacement message or indicates the HEPA filter is expired, remove the unit from use until the filter is replaced and the required verification is completed.
Expected outcome: The air intake is unobstructed and the filter is within its service interval.
Why it matters: The fan draws room air through the HEPA filter before heating and delivery. The service documentation specifies HEPA filter replacement every 2,000 operating hours or 365 days, whichever occurs first.
8. Evaluate for Environmental or Electromagnetic Interference
If the complaint is intermittent and occurs only in a particular clinical location, temporarily evaluate the unit away from adjacent powered equipment.
Where appropriate, reposition nearby cabling or connect the warming unit to a separate approved outlet circuit branch for troubleshooting purposes.
Expected outcome: The unit operates consistently without intermittent alarms or unstable temperature output.
Stop if resolved: If performance becomes stable after separation from nearby equipment or relocation, document the environmental finding and coordinate corrective action before clinical reuse.
Why it matters: The manufacturer identifies electromagnetic interference as a possible contributor to warming unit performance problems.
9. Perform a Controlled Temperature Accuracy Verification
With the unit removed from patient use, perform temperature verification using an appropriate calibrated temperature probe and approved Clinical Engineering procedure.
For the manufacturer-described verification approach:
- Confirm that the unit passes power-on self-test and enters ready mode.
- Fully compress the hose and position it vertically with the nozzle facing upward.
- Position the temperature probe at the metal screen near the base of the hose duct adapter.
- Test the 34°C setting and allow at least 3 minutes for stabilization.
- Confirm measured output is within 1°C of the selected temperature.
- Repeat at the 47°C setting, allowing at least 3 minutes for stabilization.
Expected outcome: Measured output temperature stabilizes within 1°C of the selected temperature at both tested settings.
Stop if resolved: If the unit passes temperature accuracy verification and no setup or blanket defect remains, document successful testing and complete required post-service safety checks before return to service.
Why it matters: This separates a clinical warming-performance complaint from a confirmed blower temperature-control failure.
10. Check for Airflow Failure During Bench Verification
With the unit off the patient and using an approved test setup, select the 34°C setting and confirm that the fan ramps up, airflow is present at the nozzle, and no alarm occurs.
Expected outcome: The unit delivers consistent airflow without alarm or shutdown.
Stop if resolved: If low warming performance was caused by an external hose, blanket, intake, or filter-related airflow restriction that has been corrected, document and complete appropriate verification before return to service.
11. Review Displayed Alarm or Error Information
If the unit fails temperature verification, produces an alarm, shuts off the heater or fan, or cannot maintain stable output, record the displayed alarm message and available error information.
Do not proceed into internal component troubleshooting as part of this guide.
Expected outcome: The failure is documented clearly for bench evaluation or repair.
Why it matters: The manufacturer’s troubleshooting path for heater failure or temperature accuracy failure moves from recorded error information to internal evaluation of the thermistor, heater circuitry, or power/control assemblies.
If the Problem Persists
If the WarmTouch WT 6000 still does not reach or maintain the selected temperature after verifying power, settings, hose condition, compatible blanket connection, air intake, filter status, environmental factors, airflow, and temperature accuracy, common external causes have been ruled out.
The issue is likely related to an internal temperature-sensing, heater-control, fan-control, or power/control component failure.
The device should be:
- Removed from service
- Labeled Out of Service
- Sent for repair or bench evaluation according to department procedure
Do not return the unit to patient care based only on perceived warmth at the hose or blanket. Knowing when to stop and escalate is proper Clinical Engineering troubleshooting.
Clinical Use Tip
Do not troubleshoot warming performance on an active patient. Transfer the patient to a known-working warming system first, then evaluate the affected unit in a controlled environment. Never apply warmed air directly from the hose to the patient without the correct attached blanket.
Work Order Documentation (CCR Method)
CCR = Complaint, Cause, Resolution
Complaint
What was reported by the clinical staff.
Example:
"Clinical staff reported that the Medtronic WarmTouch WT 6000 produced airflow but would not reach or maintain the selected warming temperature during setup for patient use."
Cause
What was observed during troubleshooting.
Example:
"Found the unit failed controlled temperature verification at the heated settings after confirming proper power connection, clear air intake, serviceable filter status, intact hose, and correct WarmTouch blanket connection."
Resolution
What action was taken.
Example:
"Removed the WarmTouch WT 6000 from service, labeled it Out of Service, documented displayed behavior and test results, and routed the unit for bench evaluation of the temperature-control system."
Helpful Details to Include (If Known)
- Outlet tested and power cord condition
- Status LED color and operating mode observed
- Selected temperature setting and displayed temperature behavior
- Any alarm message or error information displayed
- Hose, nozzle, and blanket connection condition
- Confirmation that a WarmTouch blanket was used
- Air intake condition and filter status
- Airflow present, weak, intermittent, or absent
- Measured output temperature at 34°C and 47°C settings
- Whether the temperature stabilized within specification
- Any unusual sounds, heat, or odor
- Final device status: returned to service or removed from service
Final Thought
Patient warming complaints require careful separation of setup-related heat loss from true temperature-control failure. Begin with patient safety and external checks, verify airflow and temperature objectively, and escalate when performance remains unreliable. Accurate CCR documentation supports safe disposition and efficient repair.
That is successful troubleshooting.