Roche Diagnostics April 2007
Service manual · Version 2.0 D-13
91xx pH/Electrolyte Analyzers 13 Troubleshooting
Error messages and troubleshooting
VALVE OVERTEMP! CHECK VALVES
In case one of the valve solenoids overheats, the message VALVE OVERTEMP!
CHECK VALVES will be displayed. Each solenoid incorporates a thermo-fuse, which
will reset automatically.
Possible causes and remedies
o Turn power off for at least one hour.
o Check fuse F3 (24V).
o Check whether room temperature is within specified limits (15°C to 32°C / 60°F
to 90°F).
ERROR: UPPER NEEDLE SENSOR
If probe movement to the upper position is not detected within a certain time period,
the above message is displayed.
Possible remedies
o Check for foreign material that may prevent the probe from moving freely.
o Contact Roche Diagnostics for technical assistance.
ERROR: LOWER NEEDLE SENSOR
If probe movement to the lower position is not detected within a certain time period,
the above message is displayed.
Possible remedies
o Make sure the fill port is installed correctly.
o Check for foreign material that may prevent the probe from moving freely.
o Contact Roche Diagnostics for technical assistance.
WHEEL MISSING OR SAMPLER DEFECT
During the homing sequence, the sampler checks for the sample wheel to be present.
Possible remedies
o Make sure the wheel is present and seated correctly.
o Replace sample wheel.
o Replace sampler.
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