6. Troubleshooting
6.1 Solving typical problems
If you experience problems with GMW80 series transmitters, first see the following tables (for
analog output and Modbus models) concerning the behavior and error indications of the
transmitter. If you cannot locate the source of the error and return the transmitter to
operational state, contact Vaisala. See
.
Table 5 Troubleshooting table, transmitters with analog output
Problem or message
Possible cause
Solution
Analog output reading is
unchanging and appears
incorrect.
Transmitter has set the analog
output to the error level (3.6
mA or 11 V) because the
transmitter is in the error state.
Determine what has caused the
error state and remove the
cause.
For a description of the error
state and its possible causes,
see
Temperature reading is too
high.
Transmitter is installed in an
unsuitable location, for
example, near a heat source or
in sunlight.
Relocate transmitter. See
.
Transmitter is installed in
improper orientation.
Reinstall transmitter with the
arrow on the mounting base
pointing up.
Unsuitable operating
environment.
Verify that the operating
environment is within specified
operating limits.
CO
2
reading is too high.
Source of CO
2
near the
transmitter.
• Use a portable instrument to
verify the CO
2
reading at the
installation location. Avoid
breathing on the instruments
while checking.
• Check for sources of CO
2
in
the measured area, such as
people working right next to
the transmitter.
CO
2
measurement module
must be replaced.
See
measurement module (GM10)
(page 36)
.
Chapter 6 – Troubleshooting
39
