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54400_trouble.fm
Troubleshooting
Section 4
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
must be returned. Referring
4.1 Troubleshooting Guide
supplies troubleshooting information for the instrument. After
determining the symptom and probable cause, perform the corrective action
steps in the order given.
Table 4 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 (Refer to the
CL17
Instrument Manual
).
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 tubing.
Summary of Contents for 54400-18
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