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13
Troubleshooting
In the event the bath appears to function abnormally this section may help to
find and solve the problem. Several possible problem conditions are described
along with likely causes and solutions. If a problem arises please read this sec-
tion carefully and attempt to understand and solve the problem. If the bath
seems faulty or the problem cannot otherwise be solved, then contact an Autho-
rized Service Center for assistance. Opening the unit without contacting an Au-
thorized Service Center may void the warranty.
13.1
Troubleshooting
Problem
The heater indicator LED
stays red but the temper-
ature does not increase
The controller display
flashes "CUToUT" and
the heater does not
operate
Causes and Solutions
If the display does not show "cutout" and shows the correct bath temperature,
consider the following possibilities:
Insufficient heating. Insufficient heating may be caused by the heater power
setting being too low, especially at higher operating temperatures. Switching to
the higher heater power switch setting, if available, may solve the problem.
No heating. This is caused by blown heater fuses and/or burned out heaters.
Check the heater fuses to make sure that they are still good. Access the heater
fuses by removing the L-shaped panel covering the display electronics. If they
are blown, and continue to blow when replaced, the heaters may be shorted. If
you suspect that the heaters are shorted or burned out, contact an Authorized
Service Center (see Section 1.3) for assistance.
If the display flashes "CUToUT" alternately with the correct process tempera-
ture, check the following:
Wrong cutout setting. The cutout disconnects power to the heaters when the
bath temperature exceeds the cutout set-point. This causes the bath tempera-
ture to drop back down to a safe value. If the cutout mode is set to "AUTO", the
heater switches back on when the temperature drops. If the mode is set to "RE-
SET", the heater only comes on again when the temperature is reduced and the
operator manually resets the cutout. (Refer to Section 10.8.)
Check that the cutout set-point is adjusted to 10 or 20°C above the desired
maximum bath operating temperature and that the cutout mode is set as
desired.
Continuous cutout. If the cutout activates when the bath temperature is well be-
low the cutout set-point or the cutout does not reset when the bath temperature
drops and it is manually reset, the cutout circuitry may be faulty. Try performing
the Factory Reset Sequence explained below.
Factory Reset Sequence - Hold the "SET" and "EXIT" keys down at the same
time while powering up the unit. The display shows "-init", the model number,
and the firmware version. Each of the controller parameters and calibration con-
stants must be re-programmed. The values can be found on the Report of Cali-
bration that was shipped with the instrument.
13 Troubleshooting
Troubleshooting
61
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