Vaisala HMW90 - Manual (Page 77)

Chapter 6 ____________________________________________________________ Troubleshooting
VAISALA ________________________________________________________________________ 75
CHAPTER 6
TROUBLESHOOTING
This chapter describes common problems, their probable causes and
remedies, and provides contact information for technical support.
Problem Situations
Table 11 Troubleshooting Table
Problem Possible Causes and Solutions
Temperature reading shown by
the transmitter is too high.
1. The transmitter may be installed in an
unsuitable location, for example, near a
heat source or in sunlight. See section
Relay Configuration in DIP Mode on
page 28.
2. Check that the transmitter is installed in
proper orientation, with the arrow on the
mounting base pointing up.
Relay does not seem to be
working as configured.
1. Check DIP switch settings. Is the relay
configured using DIP switches and
rotary switch, or software? Check that
the rotary switch is not between two
positions.
2. Note the effect of hysteresis in DIP
mode; see section Relay Configuration
in DIP Mode on page 23.
3. Connect to the service port using a PC
and use the STATUS command to view
the current relay settings.
4. Use the RTEST command to test that
the relay is working properly.
Transmitter does not recognize
a valid serial command,
responds with message
FAIL 1: Unknown command
1. The command may be one of the
advanced commands, and you have not
enabled them using the PASS 9000
command.
2. If you are using remote echo on the
transmitter, disable it with the
ECHO OFF command to avoid
collisions.
3. There may be an intermittent connection
problem between the transmitter and
your terminal. Issue the command again.