27Section 6 Troubleshooting6.1 Error messagesPossible sensor errors are shown by the controller.6.2 WarningsPossible sensor warnings are shown by the controller.Table 1 Error messagesError displayed Cause ResolutionMEAS OVERRANGEMeasurement range exceeded,signals too small, probe can no longermeasure this concentrationIf error occurs more frequently, find another installationlocationCAL. INSUFF. -- Calibration insufficient Probe requires another calibration point in alower concentrationCAL. INSUFF. + Calibration insufficient Probe requires another calibration point in ahigher concentrationZERO Calibration istoo close to the zero point Calibrate again with higher concentrationCAL REQUIRED No existing calibration Calibrate probeEE RSRVD ERR Error in the probe electronics Call the manufacturer's customer service departmentERROR PROBE Error in the probe electronics Call the manufacturer's customer service departmentLED FAILURE Faulty LED Call the manufacturer's customer service departmentTable 2 WarningsWarning shown Cause ResolutionREPLACE PROFILE Counter at zero Replace wiper profile, reset counterTEST/MAINT Counter expired Call the manufacturer's customer service departmentGASKET Counter expired Call the manufacturer's customer service department