ThermoFisher Scientific Wellwash 4, Service Manual

Page: 74 / 156

Chapter 8: Troubleshooting
Thermo Scientific Wellwash
®
4 Mk 2 User Manual Rev.2.3, Cat. no. 1507340 50
Table 8.1 Troubleshooting list
Error Cause Action
Mains lead not connected Connect the lead to an
appropriate supply.
Fuse blown Replace the fuse.
1 No POWER ON indicator
The pump unit POWER
switch is OFF Switch the POWER switch
ON.
Wash bottle is full Empty the waste bottle.
Air leaks Check the bottle caps for
leaks and tighten as
required.
Constricted tubing Check the tubing for kinks.
Pump failure Check that the pump unit is
switched ON.
Check that the pump unit is
correctly connected to the
washer unit.
2 VAC FAIL illuminated
Check the pump unit fuse
and replace it, if required.
Program card not inserted
Insert the program card
(6.5). 3 Carrier does not move
when START is pressed,
audible warning sounds
3 times
No row is selected Select the row number of
the last row to be washed.
Silicon tube in pinch valve
constantly pinched Push the pinch valve and
pull the tubing through the
valve and reform (7.1.5).
Air leaks at the wash bottle
cap Tighten cap; replace gasket
if necessary.
4 No delivery of wash
reagent into wells
Tubing leaks Check the tubing and tube
connectors.
5 Too small dispensing of
wash reagent into wells
Constricted or clogged
tubing Check the tubing and tube
connectors for kinks and
obstacles.
Microplate incorrectly
positioned on the plate
carrier
Check and adjust the
position of the plate carrier.
Strips incorrectly installed
in the holder Check that the strips are
correct and adjust as
necessary.
6 Unequal dispensing or
aspirating of wash
reagent
One or more dispense tips
clogged De-clog the washer tip(s)
(7.1.9).
Wash head height requires
adjustment By using the spanners
supplied, adjust the wash
head height by loosening
the locknut, lowering the
domed nut and locking into
position on the head lift rod
(5.3.2).
7 Overfilling of wells
during washing
Air leaks at the waste bottle
cap Tighten cap; replace gasket
if necessary.
8 Leakage between wash
cycles
Pinch valve not functioning
properly Push the pinch valve and
pull the tubing through the
valve and reform (7.1.5).