Chapter 7: Maintenance and Troubleshooting 49
Error Code Possible Causes Corrective Action
14 Accessory temperature/humidity probe
checksum error for humidity.
Perform user calibration or return to
factory.
15 Accessory temperature/humidity probe
checksum error for temperature.
Perform user calibration or return to
factory.
16 Accessory temperature probe calibration
checksum error.
Perform user calibration or return to
factory.
17 Hood temperature probe calibration
checksum error.
Perform user calibration or return to
factory.
18 Pressure sensor calibration checksum error. Perform user calibration or return to
factory.
19 A to D converter calibration checksum
error.
Return to factory.
20 Barometric pressure sensor calibration
checksum error.
Return to factory.
30 Pressure calibration voltage at 1 in. H
2
O
must be less than pressure calibration
voltage at 5 in. H
2
O.
Make sure calibration pressures are
correct.
31 Pressure calibration voltage at 5 in. H
2
O
must be less than pressure calibration
voltage at 15 in. H
2
O.
Make sure calibration pressures are
correct.
32 While performing user calibration of
accessory temperature/humidity probe, the
correct probe was not found.
The accessory temperature/humidity
probe was either not plugged in or is
faulty.
33 While performing user calibration of hood
temperature sensor or accessory
temperature sensor, the accessory
temperature/humidity probe was found
instead.
Plug in the selected probe.
34 Barometric pressure measured was <15.00
in. Hg.
The barometric pressure is too low to
take a reading.
35 Barometric pressure measured was >40.00
in. Hg.
The barometric pressure is too high to
take a reading.
36 Flap closed pressure was < flap open
pressure, or flap open versus flap closed
pressure ratio exceeds allowed limits.
Take data again.
37 There was an error reading the AD7708 A
to D converter.
Return to factory if error re-occurs.
38 There was an error reading the AD7718 A
to D converter.
Return to factory if error re-occurs.
39,40, 41,42 Error in logged data. If using accessory temp/humidity probe,
make sure probe securely connected.
Erase logged data.
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