Walchem WebMaster ONE Instruction Manual page 173

Sensor Board Failure
This error message is caused by a failure of the controller to recognize that the option circuit board
is connected. The ORP output relay will be forced off.
Possible Causes
Poor connection of the option board to
the sensor interface board.
Faulty sensor input board.
4-20 mA Input Board Failure
This error message is caused by a failure of the controller to recognize that the option circuit board
is connected. If using a 4-20 mA type water meter, then bleed/feed output will be forced off.
Possible Causes
Poor connection of the option board to
the relay interface board.
Faulty 4-20 mA input board.
Digital Input Board Failure
This error message is caused by a failure of the controller to recognize that the option circuit board
is connected. If utilizing the Interlock feature, then any outputs that are set to deactivate in case of
an Interlock condition will be forced off.
Possible Causes
Poor connection of the option board to
relay interface board.
Faulty digital input board.
Modem Failure
This error message is caused by a failure of the controller to recognize that the option circuit board
is connected.
Possible Causes
Poor connection of the option board to
the core board.
Faulty modem board.
Corrective Actions
Remove the option board and inspect both
mating connectors for corrosion or damage.
Reinstall the option board.
Replace the sensor input board.
Corrective Actions
Remove the option board and inspect both
mating connectors for corrosion or damage.
Reinstall the option board.
Replace the board.
Corrective Actions
Remove the option board and inspect both the
mating connectors for corrosion or damage.
Reinstall the option board.
Replace the board.
Corrective Actions
Remove the option board and inspect both
mating connectors for corrosion or damage.
Reinstall the option board.
Replace the board.
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