Hach-Lange CL17 USER MANUAL - Manual (Page 47)

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Section 7 Troubleshooting
In the event the instrument should malfunction, the following troubleshooting guide may
be used to help isolate the problem. Please contact the nearest Service Center for
assistance or shipping instructions if the instrument must be returned.
7.1 Troubleshooting guide
Table 9 supplies troubleshooting information for the instrument. After determining the
symptom and probable cause, perform the corrective action steps in the order given.
Table 9 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, fuses, and power cord
connections.
Display does not light and
the pump motor operates.
Problem with power supply Replace the main 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.
Zero reading
No Stir Bar Place Stir Bar into Colorimeter
Pinch Plate thumb screws are not
fully tightened.
Tighten the thumb screws.
Sample is not flowing to the
instrument. Check the sample conditioning and other sample
supply lines.
More than one stir bar
Remove the plug from the top of the colorimeter and
use a flashlight to illuminate the inside of the cell.
Look into the colorimeter to determine if more than
one stir bar is inside. Remove excess stir bars.
Sample is overflowing from
the colorimeter Drain line clogged or air lock in drain
line Clean drain line and/or eliminate air lock from
drain plumbing.
Excessive moisture is
condensing on the
colorimeter Temperature differential between
sample and analyzer environment is
too large. When practical, allow the sample temperature to
warm to room temperature before it enters the
analyzer.
Low reading Clogged tubing Replace the tubing