Quick Snapshot

Use this table to jump to the error you’re seeing. All fixes are based on the Roche CoaguChek XS and Pro II manuals.
 

Error / Message		Likely Cause	Quick Fix
CoaguChek XS
Test Strip		Strip present at power-on or wrong/unused strip	Remove and use a new CoaguChek XS PT strip
Meter Temperature		Meter outside 59°F–90°F (15°C–32°C)	Let meter rest at room temp ~30 minutes
Battery		Low battery	Replace all 4 AAA batteries
Test Strip Guide Cover		The test strip guide cover is not properly closed	Close the test strip guide cover until it snaps into place
Code Chip		Missing, damaged, or not inserted correctly	Insert correct code chip; contact Roche if damaged
Error 3 - Test Strip Expired		Expired strips or wrong meter date	Check meter date; use new strips with matching chip
Error 4 - Test Strip Unusable		The test strip is damaged or faulty	Power off, remove the strip, and reinsert it. If the error repeats, discard and use a new strip
Error 000 - Time Exceeded		No blood applied within 180 seconds of prompt	Power off, remove the strip, and repeat the test using a new fingerstick
Error 5 - Blood Application		Blood applied incorrectly or after timeout	Apply blood within 15 seconds; repeat with new stick
Error 6 - Test Strip Interference		Strip touched/removed during test	Repeat test; avoid touching strip during test
Error QC - Quality Control Failure		Internal QC check failed	Repeat test with new strip and fresh fingerstick
Error 7 - Measurement Error		Bad sample or very long clotting time (>8 INR)	Repeat test; confirm by lab if persists
Error 8, Error 9 - Internal Errors		Device diagnostic failure or heater contact issue	Restart (remove batteries); contact Roche if persists
CoaguChek Pro II
I-001		Battery Low	Attach the external power supply or place the meter in its docking station.
E-101		Patient ID Required	Enter a valid patient ID and repeat the operation.
E-402		Test Strip Error	Check your procedure and repeat the test using a new strip if needed. Power off, remove the strip, and retest with a fresh sample from a new finger. If it recurs, contact Roche Diagnostics.
E-403		Dosing Error	Ensure enough blood is applied. Power off, remove the strip, and repeat the test with a new strip and new puncture. If repeated errors occur, the meter may be contaminated — clean or contact Roche.
E-406		Sample Error	Unsuitable sample composition or interference. Check procedure and patient medication; repeat test with new strip and fresh sample. If it persists, verify result using another method.
—		No Message / Unusual Behavior	Wait 10 s and retry power-on. Check battery pack or connect power adapter. If still unresponsive, contact Roche.
—		Automatic Shutdown	Press the power button to reactivate. Default timeout = 5 min ( configurable by system admin).

Best Practices & Preventive Tips

• Operate and store the meter between 15°C–32°C and <85% humidity (no condensation).
• Always use CoaguChek test strips specific to the device model and the matching code chip for that strip box.
• Apply blood within 15 seconds of fingerstick and complete dosing within the meter’s 180-second window.
• Keep the test strip guide and meter clean; use only recommended disinfectants (70% isopropyl alcohol) and allow drying for at least 10 minutes before testing.
• Replace batteries promptly and verify meter date/time after battery changes (if batteries were removed >1 minute).

Contact & Support

If troubleshooting fails, contact Roche Diagnostics Technical Service:

Customer Support: 0800 731 5711
 

If you suspect device damage (heater plate/contacts), Roche advises replacement. Repairs or modifications should only be performed by authorized personnel.