Vaisala PTU300 - Manual (Page 159)

Chapter 6 _______________________________________________________________ Maintenance
VAISALA _______________________________________________________________________ 157
Error States
In error state the affected quantities are not measured and the output is
shown as follows:
- Analog channel outputs 0 mA or 0 V (you can use the serial line
command AERR or display/keypad to change this fault indication
value, see section Analog Output Fault Indication Setting on page
131.)
- Serial port outputs stars "***" instead of measurement data.
- Display shows "----" instead of measurement data.
- Cover LED is blinking.
- Error indicator is shown on the display.
1103-068
Figure 73 Error Indicator and Error Message
Number refers to Figure 73 above:
1 = Error indicator
The error indicator disappears when the error state is over and you have
checked the error message. Press the INFO button to display the error
message.
You can also check the error message via the serial interface by using the
command ERRS. In case of constant error, please contact Vaisala, see
section Technical Support on page 159.