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What This Guide Helps With
Troubleshoot abnormal dialysate temperature caused by water supply, environment, settings, flow conditions, preparation, or internal heating and sensing problems.
Step-by-Step Troubleshooting
1. Protect the Patient From Incorrect Dialysate Temperature
Do not continue dialysis using a machine with unreliable dialysate temperature regulation. Transfer treatment to another verified machine when necessary.
Take the Dialog+ out of patient use until temperature stability has been confirmed.
Expected outcome: Patient exposure to potentially unsafe dialysate temperature is prevented.
2. Confirm the Exact Temperature Complaint
Determine whether temperature is high, low, fluctuating, slow to reach the selected value, or associated with a displayed alarm.
Note whether the condition occurs continuously or only during startup, high-demand periods, after disinfection, or following relocation.
Expected outcome: The temperature behavior is documented and can be reproduced under safe test conditions.
3. Verify the Selected Temperature Setting
Check the accessible treatment setting and confirm it matches the intended clinical prescription or test setup.
Do not change the setting merely to compensate for an unexplained temperature difference.
Expected outcome: The selected value is correct. If the problem was caused by an incorrect accessible setting and normal temperature control is restored after correction, troubleshooting may stop after verification.
4. Verify Treated-Water Supply
Confirm the treated-water connection is secure and the water source is operating normally. Check for kinked hoses, restricted external connections, or other obvious supply problems.
If multiple machines show similar behavior, consider a facility water-system or environmental condition.
Expected outcome: Adequate treated-water supply is available without visible restriction.
5. Check Environmental Conditions
Determine whether the machine is located near a strong heating or cooling source, was recently moved from an extreme environment, or is being operated where ambient conditions may affect warm-up or temperature stability.
Allow appropriate equilibration when necessary before retesting.
Expected outcome: Environmental influence is ruled out or corrected.
6. Check Dialysate Flow Preparation
Confirm the machine is completing its normal preparation process and that external hoses and connections are arranged correctly.
Do not bypass startup preparation or temperature-related checks.
Expected outcome: The machine progresses normally through preparation and dialysate flow is established as intended.
7. Verify Temperature With Approved Test Equipment
If within Clinical Engineering scope, compare the machine's indicated dialysate temperature with an approved independent measurement using the applicable service procedure.
Do not adjust calibration without manufacturer-authorized documentation and approved equipment.
Expected outcome: Indicated and independently measured temperature agree within applicable manufacturer requirements. If the correction was external and verification passes, troubleshooting may stop.
8. Observe Stability Over a Functional Test
Operate the machine under an appropriate non-patient test condition long enough to determine whether temperature remains stable rather than briefly reaching the selected value.
Watch for repeating alarms, unexpected cycling, or gradual drift.
Expected outcome: Temperature reaches and maintains normal control throughout the test.
9. Escalate Persistent Temperature Problems
If settings, water supply, environment, external flow conditions, and independent measurement do not reveal the cause, remove the machine from service.
Expected outcome: Internal heater, sensor, hydraulic-control, power-control, or calibration concerns are referred for qualified service.
If the Problem Persists
Common external causes have been ruled out. Remaining possibilities include internal temperature sensing, heating control, hydraulic flow regulation, calibration, or related service-level problems.
The device should be:
- Removed from service.
- Labeled Out of Service.
- Sent for repair or bench evaluation.
- Evaluated using appropriate B. Braun documentation and approved temperature test equipment.
- Repaired or calibrated only by qualified personnel.
Perform all required temperature, alarm, dialysis, and safety tests before returning the machine to clinical service.
Stopping before unauthorized heater or sensor repair is proper troubleshooting.
Clinical Use Tip
Do not use a machine for treatment simply because the temperature eventually reaches the selected value if it remains unstable or repeatedly alarms.
Work Order Documentation (CCR Method)
CCR = Complaint, Cause, Resolution
Complaint
What was reported by the clinical staff.
Example:
"Dialysis staff reported that dialysate temperature remained below the selected value during machine preparation."
Cause
What was observed during troubleshooting.
Example:
"Clinical Engineering found the treated-water inlet hose was partially kinked behind the machine and restricting flow."
Resolution
What action was taken.
Example:
"The hose routing was corrected, temperature stabilized during testing, required checks passed, and the machine was returned to service."
Helpful Details to Include (If Known)
- High, low, or unstable temperature
- Selected temperature
- Displayed temperature
- Exact alarm message
- Water supply condition
- Hose routing
- Environmental conditions
- Independent temperature reading
- Whether other machines are affected
- Results after correction
- Final device status
Final Thought
Maintain patient safety, verify settings and water supply before assuming internal heating failure, confirm the result independently when required, escalate unresolved problems, and document the completed verification.
That is successful troubleshooting.