TROUBLESHOOTING
ERROR MESSAGES
5 - 2
Table 5-1. STT04 Error Messages for HART Devices
Message
Affected
Device
Probable Cause
Corrective Action
A/D HIGH REF FAIL
PTH
EBTH
Reference problem on
circuit board.
Replace amplifier assembly. If problem still
exists, replace cell and characterization
board. Refer to the repair/replacement sec-
tion of the appropriate instruction.
A/D LOW REF FAIL
PTH
EBTH
Reference problem on
circuit board.
Replace amplifier assembly. If problem still
exists, replace cell and characterization
board. Refer to the repair/replacement sec-
tion of the appropriate instruction.
AMBIENT TEMP HIGH
EBTH
Temperature inside the
electronics housing
exceeds 85°C (185°F)
Remove the source of temperature
extreme.
AMBIENT TEMP LOW
EBTH
Temperature inside the
electronics housing is
less than -50°C (-58°F)
AO SATURATED
All HART Process variable is
greater than +103.13% or
less than -1.25% of its
range and the analog out-
put cannot show changes
in its process.
Check for proper sensor connection to the
transmitter.
Check that the transmitter range is appro-
priate for the application.
Perform a D/A adjustment.
CAL OFFSET
WARNING
TB82
Large positive sensor off-
set (>180 mV) or large
negative sensor offset
(<-180 mV)
Clean sensor and perform buffer and pro-
cess calibration.
Inspect sensor and calibrating for shorts.
Remove all potential shorts to ground, con-
duit or metals.
CAL OFFSET
WARNING
(continued)
TB82
Large positive sensor off-
set (>180 mV) or large
negative sensor offset
(<-180 mV)
If sensor is functioning properly, order spare
sensor to replace existing sensor with spare
when transmitter does not accept calibra-
tion values.
CALIBRATION FAILED
HIGH/LOW
EBTH
The applied calibration
signal is higher/lower
than allowable factory
limits.
Calibrate the transmitter and verify the sup-
plied signals are within transmitter limits.
CALIBRATION
REQUIRED
PTH
EBTH
Field device needs to be
calibrated.
Calibrate the field device. Refer to the cali-
bration section of the appropriate product
instruction.
CELL EEPROM
FAILURE
PTH
Memory problem.
Remove power from the field device and
reapply. If problem persists replace the
amplifier assembly. Refer to repair/replace-
ment section of the field device product
instruction.
CELL TEMP OVR/
UNDR ALARM
PTH
Cell temperature over/
under user alarm limit.
Correct temperature problem.
Change alarm value. Refer to configuration
procedures for