Technical Manual
21
TROUBLESHOOTING
Many thermometer operational parameters can be tested for proper operation before the unit is taken
apart and without needing any tools. Refer to Operational Characteristics on page 5 and in
particular to the Self Tests and Biotech Mode sections for guidance on preliminary checks.
If the trouble seems to be calibration related, refer to Calibration Testing on
page 13.
If these sections do not prove useful in resolving the problem and you are sure that the instrument is
not performing properly, the following sections should guide you through the debugging process given
the proper tools and equipment.
Error Codes
The following table lists the descriptions for the different error codes obtained in Biotech Mode:
Error Codes Table
CLASS ERR NUM SELF-TEST DESCRIPTION
Probe E0.1 Probe heater accumulation test.
Probe E0.2 Probe a/d pulse width test.
Probe E0.3 Adaptive probe gain too high or too low test.
Ambient E1.1 Ambient temperature high test.
Ambient E1.2 Ambient temperature low test.
Battery E2.1 “Dead” battery test.
Internal E3.1 RAM read/write test.
Internal E3.2 ROM checksum test.
Internal E3.3 CPU instruction test.
Internal * CPU Watchdog test.
*Will cause hardware reset, but no error.
Internal E4.0 PTB resistor a/d pulse width test.
Internal E4.1 RatioCal resistor a/d pulse width test.
Internal E5.0 Heater circuit test.
Internal E5.1 Heater overheated test.
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