CytoTherm CT-D4 Manual - Página 7
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TROUBLESHOOTING
English: Unit should be opened by qualified technicians only.
French: Ne puet être ouvert que un techicien autorize.
Unit is "dead"
Computer does not boot when
turned on. Does not display
readable messages.
Display says "low water" but
there is water.
Unit does not heat but
"heating" is displayed
Bag leaked, but does not
trigger alarm and "LEAK"
message..
Temperature calibration does
not "hold", it changes .
Temperature calibration is out
of range.
MESSAGES, Troubleshooting
COLD indicates that the water temperature is less than 20.0C. As soon as the temperature rises above 20C, it
will display the true temperature.
TOO HOT is an audible and displayed alarm condition that indicates that the bath temperature is 1.0C higher
than the set temperature. If the operator pours hot water into the bath he/she will trigger this alarm.
This should never happen in normal operation. If it does, contact CytoTherm.
CLOSE LID indicates that the lid is not closed. If the lid is closed, check if there is a magnet imbedded in the
LID on the front right side. If the magnet is there, then the magnetic sensor (reed relay) may have failed. Have
technician check the sensor and its connections. If the sensor and the connections are OK then the PC board
should be replaced.
Verify that you are plugged into a live, grounded outlet.
Have qualified technician check if fuse is blown or connectors are
loose. There are three fuses (see wiring diagram) in the unit. Fuse-1 &
Fuse-2 are located on the circuit board: 8Amp for 120Vac models and
5Amp for 240 Vac models. Fuse-3 is a ¾ Amp slow blow inline fuse
on the transformer 12 Vac line.
Unit is not responding, but the display is backlit. Backlit display
indicates that the unit has power. Turn unit off for at least 10 seconds
and turn unit back on. If this does not solve problem, replace the
computer (program module part# CD4-PM).
The unit is not sensing that water is present.
a. Make sure you are using tap water or adding salt to deionized
water to make it conductive.
b. The level sensor (screw inside the BATH on the right side) is dirty.
Scrape it and then clean with alcohol.
Was the unit filled with water over 40C.? If yes then cool the water to
20C to reset the safety thermostat.
Check the Safety thermostat (#C-TH) and the heaters (#14-77) for
continuity.
Lift front of RACK. Clean the stainless steel nuts exposed on the front
of the RACK with alcohol. Clean the stainless steel springs that
protrude from the BATH with alcohol and bend out the bottom of the
spring so that it is 1.2 cm. (.5") from the BATH wall. If there is still a
problem, contact CytoTherm.
Replace temperature sensor (#CT4-TS).
Have technician check the voltage at TP1 (see wiring diagram) , it
should be 0.395 +/- .001 Vdc. If TP1 was correct, replace the
temperature sensor (#CT4-TS).
If TP1 was not correct, restore the unit to initial factory settings (see
DIAGNOSTICS) do full calibration. See Technician Functions > Full
Calibration.
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