RC12
BP™
Controls, Indicators, and Displays
3-19
CONDENSER PRESSURE TOO HIGH
The refrigeration system's high side pressure sensor indi-
cated either an open circuit, or an internal pressure above
450 psi. The fault typically indicates a refrigeration system
problem. Possible causes include:
• user repairable items such as ambient air temperature too
high, centrifuge air inlet blocked or proper clearance not
observed (see page 2-2, Location);
• Thermo Service repairable items such as a blocked con-
denser, condenser fan failure, system overcharge, or pres-
sure sensor malfunction.
Check user repairable causes before unplugging the centri-
fuge and contacting Thermo Service. (WatchLog Network™
record: COMPRESSOR.)
DOOR CLOSED SWITCH FAILURE
A run was in progress when the door closed switch opened,
indicating a circuit failure. Remove all sample from the rotor
after it stops, then unplug the centrifuge and contact Thermo
Service. (WatchLog Network™ record: DOOR.)
DOOR LOCK SWITCH FAILURE
A run was in progress when the door lock switch opened,
indicating a circuit failure. Remove all sample from the rotor
after it stops, then unplug the centrifuge and contact Thermo
Service. (WatchLog Network™ record: DOOR.)
DOOR LOCK SWITCH SHORTED
At run completion, the door lock switch did not open, indi-
cating a circuit failure. The interlock motor is de-energized;
another run will not start. Remove all sample from the rotor,
then unplug the centrifuge and contact Thermo Service.
DOOR NOT LOCKED – CONTACT SERVICE
After START was pressed, the door lock switch did not close,
indicating a circuit failure. The run will not start and the inter-
lock motor is de-energized. Remove all sample from the rotor,
unplug the centrifuge and contact Thermo Service.
DRIVE BOX FAULT
The microcomputer detected that the drive box was not
responding, possibly indicating an error internal to the drive
box electronics, or a brake resistor overheat condition. Wait
for the rotor to stop spinning (this could take as long as 30
minutes), then use the mechanical override to remove all
sample from the rotor, unplug the centrifuge and contact
Thermo Service. Read the WARNING on page 3-18.
(WatchLog Network™ record: DRIVE.)
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