Walchem W100 - WEL-PH Housing: Electrode (Sensor) Fault; Electrode Fault Troubleshooting; Controller Board Error Troubleshooting

CAUTION: There are live circuits inside the controller even when the power switch is in the
OFF position! Servicing and troubleshooting the controller must be performed by
Qualified
Service Personnel.
9
Section 4: WEL-PH Housing + Electrode (Sensor) Fault
Step 1:
 Electrode Fault
• This error indicates that the signal from the electrode is no longer valid at all. This error
condition with stop control of any output using the electrode.
Possible Cause
Corrective Action
Electrode wires shorted
Disconnect short
Faulty electrode
Replace electrode
Faulty controller
Replace or repair controller
 Controller, Power, Display, or Electrode Board Error
• This alarm occurs if the board listed is not recognized.
Possible Cause
Corrective Action
Poor ribbon cable connection
Remove and reseat ribbon cable, cycle power
Poor option card connection (not applicable to
W100)
Remove and reseat the board, cycle power
Faulty board
Replace or repair controller