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SECTION 6 TROUBLESHOOTING
In the event the instrument should malfunction, the following troubleshooting
guide may be used to help isolate the problem. Please contact the nearest
Hach Service Center for assistance or shipping instructions if the instrument
should be returned.
Table 21 supplies troubleshooting information for the instrument. After
determining the symptom and probable cause, perform the corrective action steps
in the order given.
Table 21 Troubleshooting Guide
Symptom Probable Cause Corrective Action
Display does not light and the pump motor is not operating
No operating power
Check power switch position, fuse, and power
cord connections.
Display does not light and the pump motor operates.
Problem with power supply Replace the circuit board.
Display lights and the pump motor does not operate.
Low operating power Verify the line voltage is within specifications.
Incorrect line voltage selector switch setting Check the line voltage selector switch position.
Motor cable not connected to the circuit board Check the motor cable connection.
Defective motor Replace motor.
Reading continually High (Hard)
Stir bar not installed Install stir bar.
LED not plugged in Check through view port for orange light.
Sample not flowing
Tur n samp le on.
Check sample connections.
Check sample conditioning filter for blockage.
Out of reagents Replace reagents.
LED Hard Flashing
Problem saving calibration information to
non-volatile memory
Contact Hach Service Department.
Problem saving alarm disabled status to
nonvolatile memory
Contact Hach Service Department.
LED Soft Flashing continuously (for more than 5 minutes) after power-up
Optical path blocked or optical switch not
working
Allow the instrument to complete the cycle.
Determine if the motor is running.
Cycle Power, wait 5 minutes.
Contact Hach Service Department.
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