Chapter 7 ____________________________________________________________ Troubleshooting
VAISALA _______________________________________________________________________ 215
Indications
Table 41 Indication Messages
AC (mains) off, hood heaters
not operational.
If not intentional operation mode, restore the
line voltage.
DISCONNECTED
+12 V output on the interface
unit is disconnected due to a
short-circuit in the output line.
This has no effect on the
measurement but warning lights
or similar options powered from
this output will not work.
Check connections to the +12 VOUT pin and
remove the short-circuit or excessive load.
There is a 0.9 A solid state fuse on the line.
After removing the short-circuit, reset the
FSC202 unit or give the command SET
+12VOUT ON to restore power to the
FAULT
Hood heater not operational.
Hood temperature has
increased less than 2 °C within
the 5 minutes since the heater
was turned on by the automatic
heater control circuit.
If operated only by battery/DC power, set the
hood heater OFF to prevent this indication.
Check that the yellow LED is lit on the
interface unit power supply board FSP103. If
it is not, check the fuse.
Check the heating foils visually. If there is a
black burned area on the surface, the foil
must be replaced. Contact Vaisala.
Check the wire connections on the interface
unit and the measurement unit.
Check the hood temperatures from the
status message to see if there is a hood
heater temperature sensor failure. In case
any of the hood temperatures are showing
irrelevant or missing (/////) values, there is a
temperature sensor failure. Contact Vaisala.
FAULT
Dew heater is not operational.
No current runs through the
heater element when it is on.
Check the control cable or the module in
question (FST102 or FSR102).
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