7.2 Solving Typical Problems
You can check error messages with the errs serial line command. For a list of the possible error
messages, see Error Codes (page 69). In case of constant error, contact Vaisala Technical
Support.
Table 41 Problems and Solutions
Problem or Message Likely Causes and Solutions
Measurement not working, any of the following
errors is active:
• Probe RH measurement error
• Probe T measurement error
• Sensor(s) damaged or missing. Open the
probe filter and check.
• Calibration is not done. Calibrate the probe.
• Check the supply voltage of the transmitter.
Transmitter cannot communicate with the
probe, any of the following errors is active:
• Probe communication error
• Probe checksum error
• Probe message form error
• Measurements not available
• Check the attachment of the probe to the
transmitter.
• In case of remote probe, check also the
interconnection cables.
• Replace the probe if necessary.
Serial line command not working, outputs
Unknown command.
Mistyped or unknown command, check the
command syntax and parameters.
Cannot connect to serial line, current serial
settings of the module are unknown.
Perform the following steps to connect:
1. Set your terminal settings to 19200 8 N 1
(the default settings of the transmitter).
2. Connect to the service port of the
transmitter.
3. Power up the transmitter, and type "Z" on
the serial line at least
five times.
4. The transmitter will come online with the
default settings.
5. Use the seri serial line command to set the
desired serial settings and save the settings
with the save command.
Any of the following errors is active:
• Current settings checksum error
• Default settings checksum error
Internal error. Perform the following steps:
1. Reset or power cycle the module. Check if
the error disappears.
2. Return the module to factory settings with
the frestore serial line command. Check
again.
3. If the error is still active, contact a Vaisala
service center.
HMT120 User Guide M211244EN-C
70
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