
Chapter 6 _______________________________________________________________ Maintenance
VAISALA _______________________________________________________________________ 147
Table 33 Error Messages
Humidity sensor measurement
malfunction.
Check the integrity of the humidity probe
and the probe cable. Clean the probe
from dirt, water, ice or other
Humidity sensor short circuit
Humidity sensor open circuit
Check the integrity of the humidity probe
and the probe cable.
Temperature sensor open circuit.
Temperature sensor short circuit.
Check the integrity of the humidity probe
and the probe cable. Clean the probe
from dirt water, ice or other
Temperature measurement
malfunction
Temperature sensor current leak.
Internal transmitter failure. Remove the
transmitter and return the faulty unit to
Vaisala Service.
Checksum error in the internal
configuration memory
Internal EEPROM read error
Internal EEPROM write error
Add-on module 1 (or 2) connection
failure
Turn off the power and check the
module connection. Turn on the power.
Device internal temperature out of
range
Ensure that the operating temperature is
within the valid range.
Internal RAM memory or software
checksum error
Internal transmitter failure. Remove the
transmitter and return the faulty unit to
Vaisala Service.
Internal ADC reference voltage out
of range
Internal analog output reference
voltage out of range
Configuration switches for analog
output 1/2/3 set incorrectly
Check and re-set the switches, see
page 57.
Internal error in add-on module 1 (or
2)
Disconnect the power and check the
module connection.
Communication module installed in
incorrect add-on module slot
Disconnect the power and change the
communication module to another
Unknown/incompatible module
installed in add-on module slot
Ensure that the module is compatible
with the DMT345/346.
Internal analog voltage out of range
Internal transmitter failure. Remove the
transmitter and return the faulty unit to
Internal system voltage out of range
Check that the supply voltage is correct
and the power supply can provide
enough power for the instrument.
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