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What This Guide Helps With
Use this guide when dialysate temperature is high, low, or fluctuating due to setup, supply, environment, flow, or service-level temperature-control problems.
Step-by-Step Troubleshooting
1. Protect the Patient From Unverified Dialysate Temperature
Do not continue treatment when dialysate temperature is unreliable or repeatedly alarming. Move the patient to another verified machine as clinically appropriate before technical troubleshooting.
Do not bypass or silence a protective temperature condition to maintain treatment.
Expected outcome: The affected machine is no longer relied upon for patient treatment until temperature control is verified.
2. Confirm the Temperature Behavior
Determine whether the temperature remains too high, remains too low, fluctuates, or fails only during a particular stage of preparation or treatment.
Record the displayed value or message and whether the condition begins immediately or after the machine has been operating.
Expected outcome: The temperature problem is clearly characterized and reproducible.
3. Verify the Selected Temperature Setting
Check the normal operator-accessible treatment settings and confirm the intended dialysate temperature has been selected.
Compare against the treatment prescription or a known-good machine when appropriate.
Expected outcome: The selected setting matches the intended clinical setup. If the wrong setting caused the condition and correction restores normal operation, proceed to final verification and stop troubleshooting.
4. Verify Water Supply and External Flow Conditions
Inspect the incoming water connection for kinks, restriction, leakage, or obvious interruption. Confirm that the facility supply is available and that nearby machines are not showing similar temperature or water-related problems.
Expected outcome: The machine has a stable external water supply and any facility-wide issue is identified.
5. Check the Operating Environment
Ensure ventilation openings are clear and that the machine is not positioned against a heat source, in direct sunlight, or in an unusually cold or hot environment.
Inspect for excessive external heat around the machine or signs of blocked airflow.
Expected outcome: Environmental conditions are not contributing to unstable thermal performance.
6. Allow Normal Stabilization
With the machine out of patient use, restart preparation under normal conditions and observe whether temperature stabilizes as the machine completes its usual preparation cycle.
Avoid repeated rapid restarts or attempts to force operation through persistent temperature alarms.
Expected outcome: Temperature stabilizes and remains controlled through normal preparation. If it does, continue to final verification.
7. Compare With a Known-Good Machine
When practical, compare the same water source, room conditions, and operating setup with another functioning dialysis machine.
If the comparison machine behaves normally while the 5008S CorDiax remains unstable, a machine-specific problem becomes more likely.
Expected outcome: External environmental and infrastructure causes are either identified or reasonably ruled out.
8. Perform Final Functional Verification
Verify the machine maintains stable temperature throughout the applicable preparation and operational checks and that no temperature-related alarms recur.
If temperature again drifts or alarms, remove the machine from service.
Expected outcome: Dialysate temperature remains stable during verification. If successful, troubleshooting can stop and normal return-to-service processes may proceed.
If the Problem Persists
If settings, water supply, operating environment, ventilation, and normal stabilization have been verified and temperature remains abnormal, the cause may involve an internal heater, temperature sensing, hydraulic, control, or calibration function.
The device should be:
- Removed from service.
- Labeled Out of Service.
- Sent for repair or bench evaluation.
- Evaluated using approved test equipment and Fresenius Medical Care service documentation.
- Repaired or calibrated only by qualified personnel.
- Subjected to applicable temperature, hydraulic, safety, and functional verification before return to service.
Stopping when accurate temperature control cannot be confirmed is proper troubleshooting.
Clinical Use Tip
Do not allow treatment to continue on a machine with recurrent temperature alarms even if the displayed value periodically appears normal.
Work Order Documentation (CCR Method)
CCR = Complaint, Cause, Resolution
Complaint
What was reported by the clinical staff.
Example:
"Dialysis staff reported the 5008S CorDiax dialysate temperature fluctuated during machine preparation."
Cause
What was observed during troubleshooting.
Example:
"Clinical Engineering found the incoming water hose partially kinked behind the machine, restricting normal supply conditions."
Resolution
What action was taken.
Example:
"The hose was repositioned, preparation was repeated, temperature remained stable through verification, and the unit was returned to service."
Helpful Details to Include (If Known)
- High, low, or fluctuating condition.
- Displayed temperature or message.
- Selected temperature setting.
- Water hose condition.
- Facility water status.
- Whether nearby machines were affected.
- Room and ventilation conditions.
- Results after restart.
- Results before and after correction.
- Final device status.
Final Thought
Temperature complaints should be approached by first protecting the patient, then confirming settings, supply conditions, and environment before considering internal thermal-control problems and escalating appropriately.
That is successful troubleshooting.