Troubleshooting – Hach-Lange WPC-22 User Manual
Page 18
3. Open the electrical access panel. Turn the two ¼-turn captive screws
only ¼ turn.
4. Replace the fuse. Refer to the illustrated steps in
.
5. Assemble the instrument. Do the illustrated steps in
reverse order.
6. Close and attach the electrical access panel with the two ¼-turn
screws.
7. Set the power switch to on.
8. Close the enclosure door. Tighten all four captive screws that attach
the enclosure door.
Figure 11 Replace a fuse
Troubleshooting
Problem
Possible cause
Solution
POWER light
does not come
on
There is no power to the
instrument or the power switch
is set to off.
Make sure that the power
switch is set to on. Make
sure that there is power to
the instrument.
ALARM light on
A network alarm is active.
Note: A network alarm is only
activated and deactivated by the
network software.
—
ALARM light
flashes
A Count alarm (stand alone
instrument only) or a Flow
alarm is active.
Note: If a Count alarm is active, the
ALARM light and the channel with an
alarm flashes on the display.
Refer to
on page 13
to configure the Count
alarm settings.
SENSOR light
on
A high calibration error is
active. The sensor is
contaminated or the laser diode
is losing power.
Clean the flow cell. Refer to
on page 16.
If the high calibration error
continues, contact technical
support.
SENSOR light
flashes
A low calibration error is active.
The photodiode is saturated
and should be cleaned,
adjusted or replaced.
Clean the flow cell. Refer to
on page 16.
If the low calibration error
continues, contact technical
support.
Two or more
instruments do
not respond to
the monitoring
software
Two or more instruments have
the same address. The
instruments with the same
address will not respond to the
monitoring software.
Switch the monitoring
software off and assign a
unique address to the
instruments that have the
same address. Refer to the
Unit ID option in
on page 13.
18 English