2008T Troubleshooting Guide
P/N 490292 Rev. A
THE (HYDRAULIC) 'ORDER' OF TROUBLESHOOTING
Understanding the ‘Order of Troubleshooting’ will lead to the root cause of a problem and NOT its effects.
1. External hydraulic leaks
2. No Water
3. Flow Errors
4. Temperature
5. Conductivity
6. Filling Programs (air sensed in the hydraulics)
7. TMP (Transmembrane Pressure)
8. Blood Leak
9. Pressure Test Failures
1. External HYDRAULIC LEAKS can cause all problems below it. If a leak is seen eliminate it before
troubleshooting any problem below it!
NOTE! Vent tubing overflow may occur with Flow Errors, Filling Programs, and “TMP is Low” alarms.
2. “NO WATER” alarms may cause Flow Errors. ENSURE a “No Water” alarm NEVER occurs before
troubleshooting any problem below it.
3. FLOW ERRORS turn the heater off. Ensure the machine remains clear of FLOW ERRORS before
troubleshooting temperature. If dialysate flow is unstable temperature will be unstable!
4. TEMPERATURE compensates conductivity. Ensure TEMPERATURE is between 35.5 and 38.5° C and
stable i.e. not changing more than 0.2º C per minute before troubleshooting conductivity. If
TEMPERATURE is unstable conductivity will be unstable which will also cause OLC to cancel!
5. In Dialysis Program, low CONDUCTIVITY will cause a false ‘air in dialysate’ signal from Chamber #69’s
Air Sensor #6 which causes Filling Programs. Do not troubleshoot a Filling Program unless
CONDUCTIVITY is between 13.0 and 14.4 mS!
6. In Dialysis Program, if Chamber #69’s Air Sensor #6 senses ‘air in dialysate’ a FILLING PROGRAM
occurs. Valve #43 opens to vent Chamber #69 to drain and therefore TMP will decrease. Do not
troubleshoot a “TMP is Low” alarm if the machine is in a FILLING PROGRAM!
NOTE! In all Cleaning Programs ‘air in dialysate’ is invalid. FILLING PROGRAM does NOT occur!
7. TMP alarms may occur if there is an external leak or ‘air in dialysate’. Do not troubleshoot TMP alarms
unless you are sure there are no leaks AND good Temperature and Conductivity.
8. ‘Air in dialysate’ may cause false BLOOD LEAK alarms. Also, if Conductivity and/or a Temperature
alarm are present ‘bypass’ occurs i.e. Valve #24 closed, Valve #26 open. In this event Blood Leak
Sensor #8 is bypassed. Ensure all alarms above BLOOD LEAK remain clear before troubleshooting
BLOOD LEAK.
9. PRESSURE TESTS may fail if any problem above it occurs. ENSURE the machine remains clear of all
alarms before troubleshooting PRESSURE TEST FAILURES.
End of ‘The Order of Troubleshooting‘
Refer to the TABLE OF CONTENTS to locate the symptom.
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