Hach CA610 User Manual page 28

Problem
The display comes on but the
pump motor will not operate.
High readings
Low readings
Erratic readings
8.1 System alarms
System alarm conditions stop the instrument and show an alarm message. Fix the alarm condition to
return to normal operation.
Push the EXIT key to stop and start the instrument. If the alarm condition is still present, refer to
Table 9.
Alarm message Description
EE ERROR The instrument cannot write to the EE ROM
A/D ERROR Faulty analog to digital converter
(Alarm LED is lit)
28 English
Table 8 Troubleshooting guide (continued)
Cause
Low operation power
Incorrect voltage selector
setting
Disconnected motor cable
Defective motor
Loose fluoride electrode
Loose reference electrode
Electrode not conditioned prior
to use
Low or missing inner fill
solution in fluoride electrode
Pressure plate screws not
tightened
No sample flow
Reagent and sample lines
incorrectly plumbed
Blocked drain line
Incorrect electrode placement
Air trapped in the system
Excess air in inner fill solution
chamber of electrode
measuring half cell
Table 9 Alarms and resolutions
Solution
Make sure that the line voltage is within
specification.
Set the line voltage selector switch to the
correct voltage.
Connect the motor cable.
Call Technical Service.
Look for O-ring and tighten the electrode.
Look for O-ring and tighten the electrode.
Let overnight operation occur and
recalibrate.
Look at inner solution. Refill if needed.
Tightened pressure plate screws.
Adjust sample flow. Look at sample filter,
replace if blocked.
Refer to plumbing diagram and correctly
plumb the reagent and sample lines.
Look at drain line flow. If no flow is seen,
remove drain line and check for blockages.
Make sure that the fluoride electrode is
installed in the top position. Make sure that
the reference electrode is installed in the
bottom position.
If analyzer is new, parts might not be
sufficiently or evenly wetted. Flush the
system with surfactant (2697453) in place of
the sample.
Refill measuring electrode inner fill solution.
Resolution
Stop and start the equipment.
Call Technical Service.
Restart the equipment.
Call Technical Service.